Academic literature on the topic 'Oxyde de bismuth Bi2O3'
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Journal articles on the topic "Oxyde de bismuth Bi2O3"
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Astuti, Yayuk, Rizka Andianingrum, Abdul Haris, and Adi Darmawan. "The Role of H2C2O4 and Na2CO3 as Precipitating Agents on The Physichochemical Properties and Photocatalytic Activity of Bismuth Oxide." Open Chemistry 18, no. 1 (2020): 129–37. http://dx.doi.org/10.1515/chem-2020-0013.
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AbstractSynthesis of bismuth oxide synthesis through the precipitation method using H2C2O4 and Na2CO3 precipitating agents, identification of physicochemical properties and its photocatalysis activity for methyl orange degradation were conducted. The bismuth oxide synthesis was undertaken by dissolving Bi(NO3)3.5H2O in HNO3, then added precipitating agents to form precipitate. The results showed that bismuth oxide produced by H2C2O4 precipitating agent was a yellow powder containing a mixture of α-Bi2O3 (monoclinic) and β-Bi2O3 (tetragonal), porous with size of 28-85 μm. Meanwhile, the use of Na2CO3 as precipitating agent resulted in bismuth oxide consisting of α-Bi2O3 and β-Bi2O3 and Bi2O4, irregular shape without pore being 40-115 μm in size. Bismuth oxide synthesized with H2C2O4 precipitating agent showed higher photocatalytic activity compared to bismuth oxide synthesized using Na2CO3 on degrading methyl orange dye with degradation rate constants of 2.35x10-5 s-1 for H2C2O4 and 1.81x10-5 s-1 for Na2CO3.
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Danamah, Hamdan M., Siddheshwar D. Raut, Zeenat A. Shaikh, and Rajaram S. Mane. "Chemical Synthesis of Bismuth Oxide and Its Ionic Conversion to Bismuth Sulphide for Enhanced Electrochemical Supercapacitor Energy Storage Performance." Journal of The Electrochemical Society 169, no. 12 (2022): 120537. http://dx.doi.org/10.1149/1945-7111/acaac9.
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Successive ionic layer adsorption and reaction (SILAR)-based room-temperature (27 °C) chemical synthesis of bismuth oxide (Bi2O3) and its ionic conversion to bismuth sulphide (Bi2S3) has been performed and reported in the present study. A chemical conversion of the bismuth oxide to the bismuth sulphide has been confirmed using changes in the structure, phase, surface elementals , and surface area measurement studies. Both bismuth oxide and bismuth sulphide electrode materials are envisaged in electrochemical measurements wherein, the later has evidenced an enhanced electrochemical performance over the prior. The cycling stability of the Bi2S3 (91% after 2000 cycles) electrode material is also better than the Bi2O3 (87% over 2000 cycles). The as-assembled Bi2S3//Bi2S3 symmetric electrochemical supercapacitor device has adduced 75.3 Wh kg−1 and 749.8 W Kg−1energy and power densities, respectively with nearly 88.8% capacitance retention efficacy even over 2000 redox cycles measured at 10 A g−1. The commercial potential of the Bi2S3//Bi2S3 has been tested by powering the display panel “CNED” consisting nearly 42 LEDs with a full-light intensity.
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Autade, Vijay B., Kaustav Bhattacharjee, Ranjit S. Kate, et al. "Solid state engineering of Bi2S3/rGO nanostrips: an excellent electrode material for energy storage applications." RSC Advances 14, no. 18 (2024): 12313–22. http://dx.doi.org/10.1039/d4ra01304b.
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Herein, the study reported unique one-pot and scalable solid-state methodology to prepare bismuth sulphide (Bi2S3)-reduced graphene oxide (rGO) nanocomposites using bismuth oxide (Bi2O3), thiourea and graphene oxide (GO) for energy storage applications.
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Mima, T., Y. Takeuchi, S. Arai, K. Kishita, K. Kuroda, and H. Saka. "In Situ Transmission Electron Microscopy Observation of the Growth of Bismuth Oxide Whiskers." Microscopy and Microanalysis 14, no. 3 (2008): 267–73. http://dx.doi.org/10.1017/s1431927608080240.
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AbstractGrowth of bismuth oxide (most probably Bi2O3) was observed in situ in a transmission electron microscope. Bi liquid particles were dispersed on the substrates of diamond or SiO2. Introduction of oxygen up to ∼5 × 10−4 Pa resulted in formation of bismuth oxide (most probably Bi2O3) whiskers. The growth mechanism of the whisker was discussed in terms of a vapor-liquid-solid (VLS) mechanism. It is suggested that the liquid droplet of Bi acts as a physical catalyst for growth of bismuth oxide (most probably Bi2O3) whiskers.
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Algethami, Merfat. "Bismuth/bismuth oxide-incorporated reduced graphene oxide nanocomposite: synthesis, characterisation, and photocatalytic activity." Materials Research Express 9, no. 2 (2022): 025001. http://dx.doi.org/10.1088/2053-1591/ac4ebb.
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Abstract This study loaded Bi/Bi2O3 on the surface of reduced graphene oxide (rGO) to perform a two-step facile synthesis of rGO@Bi/Bi2O3 as a bismuth-based nanocomposite. First, Bi/Bi2O3 nanocomposites were synthesised via a solvothermal process using Bi(NO3)3 5H2O as the Bi3+ precursor and dimethyl sulfoxide (DMSO) as the solvent. Second, we exfoliated rGO in water to functionalise Bi/Bi2O3 with a few layers of rGO. Obtained nanocomposites were characterised with scanning electron microscopy and X-ray diffraction. We also measured the nanocomposites’ photocatalytic activity using cationic dyes, specifically methylene blue (MB) and rhodamine B (RhB). Additionally, ultraviolet-visible spectroscopy was used to determine the optical properties of rGO@Bi/Bi2O3. Photodegradation was recorded under differing durations of exposure to visible light. Reaction rates were recorded at 14.6 × 10–4 min−1 and 22.2 × 10–3 min−1 for MB and RhB, respectively, while photodegradation efficiency was logged at 17% and 81%.
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Yang, Wein-Duo, and Yu-Jiang Lin. "Preparation of rGO/Bi2O3 composites by hydrothermal synthesis for supercapacitor electrode." Journal of Electrical Engineering 70, no. 7 (2019): 101–6. http://dx.doi.org/10.2478/jee-2019-0049.
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Abstract Reduced graphene oxide/bismuth oxide (rGO/Bi2O3) composites were prepared at various weight ratios of raw materials, GO and bismuth nitrate at 1:0.1, 1:0.3, 1:0.6, 1:0.9 and 1:1.2, respectively, by the improved Hummer’s method. During the process, the mixed solutions were prepared, and then rGO was obtained by hydrothermal method. Finally, the complex of rGO/Bi2O3 was prepared by calcination after hydrothermal treatment. The results show that the removal of oxygen-containing functional groups in rGO are increased with the increase of graphene agglomeration, and the Raman shifts of G band tending to the lowest wave-number. The electrochemical characteristics of the as-prepared rGO/Bi2O3 materials were also examined in 1 M KOH electrolyte. The dominating charge storage mechanisms are attributed to the electric double layer behaviors. As the content of bismuth nitrate increased, the rGO/Bi2O3 had a higher capacitance. The rGO/Bi2O3 obtained from the weight ratio of GO and bismuth nitrate of 1:1.2 as raw materials exhibit a maximum specific capacitance of 216 Fg−1, revealing that rGO/Bi2O3 obtained by hydrothermal synthesis method can be used for the carbon-electrode of a super capacitor.
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Motakef Kazemi, Negar, and Masoumeh Yaqoubi. "Synthesis of Bismuth Oxide: Removal of benzene from waters by Bismuth Oxide Nanostructures." Analytical Methods in Environmental Chemistry Journal 2, no. 04 (2019): 5–14. http://dx.doi.org/10.24200/amecj.v2.i04.79.
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In this research, bismuth oxide (Bi2O3) nanostructures were prepared via chemical method at 90 °C for 3 h. the results samples were characterized by Fourier transform infrared (FTIR) for determination of functional groups, X-ray diffraction (XRD) for evaluation of crystal structure, dynamic light scattering (DLS), scanning electron microscope (SEM) for presentation of morphology and size, energy-dispersive X-ray spectroscopy (EDS) for determination of chemical composition, and diffuse reflection spectroscopy (DRS) for ultraviolet (UV) blocking. Also, the Bi2O3 nanostructures were used for benzene extraction from waters in pH=5-7. By procedure, 30 mg of Bi2O3 mixed with hydrophobic ionic liquid ([HMIM][PF6]) and injected to water samples. After shaking and centrifuging, benzene removed from water by ionic liquid-micro solid phase extraction (IL-μSPE) and determined by gas chromatography with flame ionization detector (GC-FID). The absorption capacity and recovery was obtained 167.8 mg per gram of Bi2O3 and more than 96%, respectively.
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Astuti, Yayuk, Arnelli Arnelli, Pardoyo Pardoyo, et al. "Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide." Bulletin of Chemical Reaction Engineering & Catalysis 12, no. 3 (2017): 478. http://dx.doi.org/10.9767/bcrec.12.3.1144.478-484.
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Bismuth oxide (Bi2O3) is a well-studied photocatalyst for degradation of various environmental contaminants. In this research Bi2O3 has been synthesized by precipitation method using two different bases (NH4OH and NaOH). The samples thus obtained were then analyzed using FTIR, XRD, and SEM for surface functionalization, crystal structures and morphological differences, respectively. The Bi2O3 precipitated using NH4OH showed a flower like structure made up of individual plates having α-Bi2O3 crystal structure. The precipitate obtained using NaOH showed a honeycomb like flower structure with a mixture of both α-Bi2O3 and γ-Bi2O3 crystal structure. Degradation of methyl orange (MO) was used as a model system to test the photocatalytic activity of the bismuth oxide. The Bi2O3 synthesized using NH4OH showed superior photocatalytic degradation of methyl orange than the one synthesized using NaOH. Copyright © 2017 BCREC Group. All rights reservedReceived: 12nd April 2017; Revised: 24th June 2017; Accepted: 12nd July 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Astuti, Y., Arnelli, Pardoyo, Fauziyah, A., Nurhayati, S., Wulansari, A.D., Andianingrum, R., Widiyandari, H., Bhaduri, G.A. (2017). Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 478-484 (doi:10.9767/bcrec.12.3.1144.478-484)
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Lin, Hsiu-Na, May-Show Chen, Yu-Hsueh Chang, Pee-Yew Lee, and Chung-Kwei Lin. "Effect of Oxygen Concentration and Tantalum Addition on the Formation of High Temperature Bismuth Oxide Phase by Mechanochemical Reaction." Materials 12, no. 12 (2019): 1947. http://dx.doi.org/10.3390/ma12121947.
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High-temperature face-centered cubic bismuth oxide phase is a material of great interest given its unique properties. In the present study, α-Bi2O3 and tantalum powders were used as the starting powders for the formation of high-temperature bismuth oxide phase via mechanochemical synthesis by high energy ball milling. (Bi2O3)80(Ta)20 and (Bi2O3)95(Ta)5 in weight concentrations were milled in either an oxygen-free argon-filled glove box environment or an ambient atmosphere to investigate the effects of oxygen concentration and tantalum addition. The as-milled powders were examined using X-ray diffraction, scanning electron microscopy with energy-dispersive spectroscopy, and differential scanning calorimetry to reveal the structural evolution. The experimental results showed that for (Bi2O3)95(Ta)5 powder mixtures milled within the glove box, tantalum gradually reacted with the α-Bi2O3 phase and formed a β-Bi7.8Ta0.2O12.2 phase. For (Bi2O3)80(Ta)20 milled under the same conditions, Ta and α-Bi2O3 mechanochemically reacted to form δ-Bi3TaO7 and bismuth after 10 min of high energy ball milling, whereas milling (Bi2O3)80(Ta)20 under the ambient atmosphere with a much higher oxygen concentration accelerated the mechanochemical reaction to less than five minutes of milling and resulted in the formation of high-temperature δ-Bi3TaO7 phase.
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Malligavathy, M., and D. Pathinettam Padiyan. "Phase Purity Analysis and Optical Studies of Bi2O3 Nanoparticles Suitable for Photocatalytic Activity." International Journal of Nanoscience 17, no. 03 (2018): 1760040. http://dx.doi.org/10.1142/s0219581x17600407.
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Bismuth oxide was prepared using hydrothermal route and the effect of pH on the phase of Bi2O3 reported. Phase pure [Formula: see text]-Bi2O3 was prepared at the pH of 13 and its phase purity was confirmed from the X-ray diffraction pattern. At the pH of 10, 11 and 12 the hydrothermal synthesis yields Bi(OH)3, ([Formula: see text], [Formula: see text]-Bi2O3) & Bi2O4 and mixture of [Formula: see text]-Bi2O3 & Bi2O4, respectively. The optical band gaps were calculated from reflectance spectra using the Kubelka–Munk relation and the values decrease from 3.050(3) to 2.686(3) eV with the increase in pH value. Photoluminescence intensity decrease with the increase of pH value indicated the increase in the charge separation efficiency. In the application point of view, the photocatalytic activity of the samples was evaluated for methyl orange and among the four samples, [Formula: see text]-Bi2O3 degraded 67% within 4[Formula: see text]h. The degradation of dye was analyzed using pseudo first-order kinetics and the rate constant value was 0.0045(3) min[Formula: see text] with the correlation coefficient of 0.983.
Dissertations / Theses on the topic "Oxyde de bismuth Bi2O3"
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Bourja, Lamia. "Étude du système CeO2-Bi2O3 pour applications catalytiques et conductimétriques." Phd thesis, Toulon, 2011. http://tel.archives-ouvertes.fr/tel-00659119.
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Dans le cadre général des études de matériaux multifonctionnels, électrolytiques et catalytiques, susceptibles d'être utilisés au sein de dispositifs de détection de gaz, un système d'oxydes (1-x)CeO2. x/2Bi2O3 avec 0≤x≤1 a été élaboré par coprécipitation puis traitement thermique à 600°C. Le système ainsi obtenu correspondrait à un diagramme de phases original, constitué d'un domaine de solutions solides (Ce1-xBixO2-z pour x ≤ 0,20), d'un domaine multiphasé pour 0,3≤x≤0,7 comportant une phase de type quadratique b'-Bi2O3 et une phase cubique substituée limite (x=0,20), d'un autre domaine multiphasé pour les compositions 0,8≤x≤1, comportant une phase quadratique b-Bi2O3 et une phase monoclinique. Ces deux phases ont déjà été considérées dans la littérature comme phases métastables résultant de divers modes de refroidissement de la phase pure Bi2O3. Dans le cas présent, la stabilisation de ces deux phases b' et b en présence d'une phase substituée cubique Ce1-xBixO2-z pourrait être due à la présence d'ions cérium au sein duréseau cristallin de Bi2O3. Les interactions catalytiques entre des échantillons polycristallins de ce système avec x variable et des mélanges air-CO et air CH4 ont été étudiées par spectroscopie infrarouge à transformée de Fourier dans le domaine 100 à 525°C. Il apparait que les composés riches en cérium ou riches en bismuth n'ont pas la même réactivité vis-à-vis des gaz CH4 ou CO. Cette diversité de propriétés catalytiques pourrait être utilisée au sein de systèmes multicapteurs de gaz.Une étude de la conduction électrique du système pour x variable a été effectuée par spectroscopie d'impédance électrique entre 100 et 750°C. Les représentations Nyquist des impédances électriques ont été interprétées en mettant en jeu des modèles de type élément de phase constante ou de type Warburg pour prendre en compte l'hétérogénéité des échantillons ainsi que les phénomènes de réaction-diffusion aux électrodes. La conductivité en volume (coeur de grains) augmente avec la composition, avec deux types d'évolutions distinctes : une évolution caractéristique de la phase substituée liée à l'augmentation du taux de lacunes, une évolution dans le système biphasé avec une forte augmentation de conductivité au-dessus de x=0,3 et un maximum atteint pour x=0,7. La phase quadratique de type b'-Bi2O3 connue comme phase métastable est ainsi stabilisée au sein de ce système mixte, au moins à 600°C: elle serait à l'origine de la forte conductivité ionique observée pour la composition proche de x = 0,7.
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Bourja, Lamia. "Étude du système CeO2-Bi2O3 pour applications catalytiques et conductimétriques." Electronic Thesis or Diss., Toulon, 2011. http://www.theses.fr/2011TOUL0007.
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Dans le cadre général des études de matériaux multifonctionnels, électrolytiques et catalytiques, susceptibles d’être utilisés au sein de dispositifs de détection de gaz, un système d’oxydes (1-x)CeO2. x/2Bi2O3 avec 0≤x≤1 a été élaboré par coprécipitation puis traitement thermique à 600°C. Le système ainsi obtenu correspondrait à un diagramme de phases original, constitué d’un domaine de solutions solides (Ce1-xBixO2-z pour x ≤ 0,20), d’un domaine multiphasé pour 0,3≤x≤0,7 comportant une phase de type quadratique b’-Bi2O3 et une phase cubique substituée limite (x=0,20), d’un autre domaine multiphasé pour les compositions 0,8≤x≤1, comportant une phase quadratique b-Bi2O3 et une phase monoclinique. Ces deux phases ont déjà été considérées dans la littérature comme phases métastables résultant de divers modes de refroidissement de la phase pure Bi2O3. Dans le cas présent, la stabilisation de ces deux phases b’ et b en présence d’une phase substituée cubique Ce1-xBixO2-z pourrait être due à la présence d’ions cérium au sein duréseau cristallin de Bi2O3. Les interactions catalytiques entre des échantillons polycristallins de ce système avec x variable et des mélanges air-CO et air CH4 ont été étudiées par spectroscopie infrarouge à transformée de Fourier dans le domaine 100 à 525°C. Il apparait que les composés riches en cérium ou riches en bismuth n'ont pas la même réactivité vis-à-vis des gaz CH4 ou CO. Cette diversité de propriétés catalytiques pourrait être utilisée au sein de systèmes multicapteurs de gaz.Une étude de la conduction électrique du système pour x variable a été effectuée par spectroscopie d’impédance électrique entre 100 et 750°C. Les représentations Nyquist des impédances électriques ont été interprétées en mettant en jeu des modèles de type élément de phase constante ou de type Warburg pour prendre en compte l’hétérogénéité des échantillons ainsi que les phénomènes de réaction-diffusion aux électrodes. La conductivité en volume (coeur de grains) augmente avec la composition, avec deux types d’évolutions distinctes : une évolution caractéristique de la phase substituée liée à l’augmentation du taux de lacunes, une évolution dans le système biphasé avec une forte augmentation de conductivité au-dessus de x=0,3 et un maximum atteint pour x=0,7. La phase quadratique de type b’-Bi2O3 connue comme phase métastable est ainsi stabilisée au sein de ce système mixte, au moins à 600°C: elle serait à l’origine de la forte conductivité ionique observée pour la composition proche de x = 0,7To develop multifunctional and sensitive materials for gas sensor, catalytic microsystems and electrolytic applications, the multiphase system (1-x).CeO2 + ½ x.Bi2O3 has been investigated in the bismuth composition range 0≤x≤1. A series of ceramics samples has been prepared via a coprecipitation route followed by a thermal treatment at 600°C. X-ray diffraction analyses showed that, for x ≤ 0.20, a solid solution Ce1- xBixO2-x/2 with fluorine structure was formed. For x ranging between 0.25 and 0.7, a tetragonal b’-Bi2O3 phase coexisting with the solid solution was observed. For x ranging between 0.8 and 0.9, a new tetragonal b'-Bi2O3 phase, closely related to the b' phase was evidenced. Finally, close to x=1, the classical monoclinic a-Bi2O3 structure crystallized. The formation of such intermediate tetragonal b and b’ phases could be due of theprobable presence of cerium cations in the Bi2O3 lattice. The solid–gas interactions between these polycristalline materials and air–CH4 and air–CO flows have been studied as a function of time, temperature and composition x, using Fourier transform infrared (FTIR) analyses of the conversions of CH4 and CO gases into the CO2 gas. For all compositions, a low catalytic reactivity was observed with air–CH4 gas flows, while, for the highest bismuth compositions, a high catalytic reactivity was observed with air–CO gas flows. The electrical conduction of this series of polycrystalline samples has been analyzed using electrical impedance spectroscopy, in the temperature range 25 to 750°C. To interpret the Nyquist representations of electrical analyses, various impedance models including constant phase elements and Warburg impedances have been used. The optimal conduction observed close to composition x=0.7 should be due to the stabilization of the tetragonal b’ Bi2O3 phase. This specific multiphase system could present a high interest in catalytic and electrolytic applications
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Li, Rong. "Preparation and ion conductivity of nano to micron grains size Bi2O3-Ln2O3 (Ln=Dy, Y, Er) ceramics." Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10141/document.
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L’objectif de ce travail était l’étude de l’effet de la taille des grains de céramiques à base d’oxyde de bismuth sur les propriétés de conduction ionique. Avec pour objectif la préparation de céramiques denses avec des grains de taille nanométrique, des poudres de composition (Bi2O3)0.75(Dy2O3)0.25, (Bi2O3)0.75(Er2O3)0.25, (Bi2O3)0.75(Y2O3)0.25 et (Bi2O3)0.75(Er2O3)0.125(Y2O3)0.125 ont été préparées avec succès par une méthode de dosage en retour. Des poudres avec des grains mono-cristallins d’environ 20 nm ont été obtenues, à partir desquelles, des céramiques denses ont ensuite été préparées par frittage conventionnel et par « Spark Plasma Sintering ». Par les deux méthodes, des céramiques de densités relatives supérieures à 94% sont obtenues. Par SPS, la taille des grains est de 20nm seulement. Elle varie de 60 à 500nm par frittage conventionnel pour lequel une croissance des grains contrôlée par le transport de matière aux joints de grain est démontrée.L’effet de la taille des grains sur la conductivité a finalement été étudié par spectroscopie d’impédance. Une diminution de la conductivité avec la taille des grains est généralement observée, probablement due au caractère bloquant des joints de grain. En revanche, la composition (Bi2O3)0.75(Dy2O3)0.25 avec des grains de 22nm présente des conductivités au dessus de celles de la céramique de même composition avec des grains de 62nm et une meilleure séparation des réponses dues aux grains et aux joints de grains. Pour des tailles de grains aussi faibles, les couches d’espace de charge entre les grains ne peuvent plus être négligées et le phénomène observé est probablement dû à une augmentation de la conductivité dans ces couchesThe aim of this work was the study of the effect of the grain size of bismuth based oxide ceramics on the ionic properties. With the aim to prepare dense ceramics with controlled grain size at the nano-scale, nano-powders of (Bi2O3)0.75(Dy2O3)0.25, (Bi2O3)0.75(Er2O3)0.25, (Bi2O3)0.75(Y2O3)0.25 and (Bi2O3)0.75(Er2O3)0.125(Y2O3)0.125 compositions were successfully prepared by a reverse chemical titration method. As shown by XRD and TEM, after annealing for 3 hours at 500°C, powders with single crystal grains with size of about 20nm were obtained. At that stage, a b-form was evidenced for all compositions.Then, conditions of sintering were optimized. Two techniques were used: pressureless sintering in a conventional furnace and Spark Plasma Sintering (SPS). In both methods, it led to ceramics with relative density higher than 94%. The grain size was only 20nm by SPS. It ranges from 60nm to 500nm by conventional sintering, for which it was shown that the grain growth was controlled by mass transport through the grain boundaries. The effect of grain size on total ionic conductivity was studied by impedance spectroscopy for all compositions. For most compositions, a decrease of total ionic conductivity with grain size was observed due to a predominant blocking effect of grain boundary when grain size decreases. However (Bi2O3)0.75(Y2O3)0.25 with grain size of 22nm showed a better conductivity than ceramics with grain size of 62nm and a better separation of bulk and grain boundary response. At such a low size, the space charge layers effect between grains can not be neglected anymore and the observed increase in conductivity is likely the results of an increase of the conductivity in this space charge layers
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Schmidt, Samara [UNESP]. "Estudo da modificação da fotoluminescência em α-Bi2O3 após tratamento térmico assistido por pressão". Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/136399.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este estudo avaliou o efeito de um tratamento térmico assistido por pressão sobre as propriedades de fotoluminescência do óxido de bismuto (α-Bi2O3) sintetizado pelo método hidrotérmico assistido por micro-ondas (HAM). O α-Bi2O3 teve sua estrutura determinada através da técnica de Difração de raios X, e com o auxílio de refinamentos pelo método de Rietveld foi possível visualizar que a amostra tratada com pressão possui um ângulo entre os clusters [BiO6]-[BiO6] ligeiramente maior. As técnicas de microscopia eletrônica de varredura e transmissão possibilitaram a definição da morfologia acicular, tamanho e direção de crescimento dos cristais. A composição química dos materiais foi avaliada pelas espectroscopias Raman e de Fotoelétrons excitados por raios X, onde os espectros Raman mostraram um aumento da intensidade nos modos acima de 284cm-1 na amostra tratada com pressão, sugerindo uma alteração na densidade eletrônica. Os espectros XPS em ambas amostras não mostraram a presença de contaminantes, fase secundária ou íons Bi2+. Ambas as técnicas mostraram que as emissões PL do α-Bi2O3 na região de baixa energia (inferior a 2,1 eV) são atribuídas a lacunas de oxigênio que formam estados doadores. As propriedades óticas dos materiais foram avaliadas e comparadas com o auxílio da técnica de espectroscopia Uv-vis, onde não foi possível verificar nenhuma alteração significativa nas amostras. As propriedades fotoluminescentes das amostras também foram medidas e comparadas. Foi possível verificar que o tratamento térmico assistido por pressão causou um aumento angular entre os clusters [BiO6] - [BiO6] do α-Bi2O3, resultando num aumento significativo da intensidade da emissão PL na amostra tratada com pressão. Cálculos teóricos foram utilizados para simular as bandas de valência e condução dos materiais assim como a densidade eletrônica média nessas bandas. Através dos cálculos foi possível visualizar como a distorção dos clusters altera a polarização dos estados O 2p, e consequentemente a densidade eletrônica dos cristais.
This research evaluated the effect of a pressure-assisted heat treatment (PAHT) on the photoluminescent (PL) properties of bismuth oxide (α-Bi2O3), which was synthesized by a microwave-assisted hydrothermal (MAH) method. α-Bi2O3 crystal structure was characterized X-ray diffraction, and Rietveld refinements showed the pressure-assisted heat treatment caused an angular increase between the [BiO6]– [BiO6] clusters of α-Bi2O3. Scanning and transmission electron microscopies allowed defining the morphology (acicular), size and crystal growth direction of crystals. Chemical composition of samples was evaluated by Raman and X-ray photoelectron (XPS) spectroscopies. Raman spectra showed an increase in the spectrum intensity for frequencies higher than 284 cm-1 for PAHT samples, which suggests an alteration in the electronic density of crystals. XPS spectra of samples did not show the presence of contaminants, secondary phases and Bi2+ ions. Both Raman and XPS spectra also showed that the α-Bi2O3 PL emissions in the low-energy region (below 2.1 eV) are attributed to oxygen vacancies that form defect donor states. UV–vis absorption spectra showed no significant difference between samples. The angular increase between [BiO6]–[BiO6] clusters of α-Bi2O3 promoted a significant rise in the electronic density of the material, which was considered as the cause for the increase in PL emission intensity in PAHT samples. First-principles total-energy calculations were carried out within the periodic density-functional-theory (DFT) to simulate valence and conduction bands, and the average electronic density in these bands. Theoretical results showed how cluster distortion alters the polarization of O 2p states, and consequently, the electronic density of crystals.
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Laabidi, Olfa. "Relations structures-propriétés dans le système Bi2O3-PbO-V2O5 : surstructures, polymorphisme, incommensurabilité et conductivité." Lille 1, 2006. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2006/50376_2006_286.pdf.
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Ce travail concerne la recherche de nouveaux matériaux à base de bismuth à propriétés spécifiques plus performantes, ou l'amélioration de propriétés de matériaux connus telles que la conduction ionique pour son intérêt en particulier dans le domaine énergétique. Dans le système Bi2O3-PbO-V2O5, notre travail a porté tout d'abord sur le domaine riche en bismuth. La structure du composé PbBi6V2O15 a été déterminée. Le problème de discernement par diffraction X de Bi3+ et de Pb2+ a été abordé par le remplacement du plomb par d'autres cations M2+ tels que Sr2+, Ca2+ et Cd2+. Les déterminations structurales sur monocristaux ont révélé des solutions solides. Partant de la structure connue Pb5Bi18V4O42. Le remplacement du Pb par Sr. Ca et Cd a abouti à de nouvelles phases cristallines non stoechiométriques. Il s'agit dans ces différents cas de surstructures dérivées de Bi2O3-ð[delta]. L'étude s'est prolongée au sein du binaire Bi VO4-nPbO. Une transition de phase α→β a été caractérisée pour Ie terme n=1, PbBiVO5. Les structures des cristaux «macIés» ont été résolues à l'ambiante et à 530°c. PbBiPO5 subit une transition analogue. PbBiAsO5 cristallise dès l'ambiante dans la forme β. Pb2BiVO6, (n=2) subit plusieurs transitions structurales α β et ð. Les structures des formes α et β ont été déterminées sur monocristal : la résolution de la struture de β a nécessité l'emploi d'un formalisme 4D. Deux nouvelles formes α' et ð' ont été obtenues par substitution du V par Mn ou P. Leurs structures découlent des phases α à l'ambiante, et ð à 680°C. La conductivité électrique des matériaux a été étudiée et des corrélations propriétés de conduction - caractéristiques structurales proposées.
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Joumard, Isabelle. "Transitions de phases et dynamique des vortex dans (K,Ba)BiO3." Université Joseph Fourier (Grenoble ; 1971-2015), 2000. http://www.theses.fr/2000GRE10209.
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L'oxyde supraconducteur (k,ba)bio 3 presente deux interets majeurs. Premierement, son faible champ critique superieur (h c 2<30t) permet d'acceder experimentalement a tout le diagramme de phases h-t. Ce diagramme de phases s'avere tout aussi riche que celui des cuprates (differentes phases de vortex). Deuxiemement, la dynamique des vortex semble tres proche de celle des cuprates mais plus simple a etudier en raison du caractere isotrope de ce compose. Ainsi, (k,ba)bio 3 est un systeme modele pour l'etude des transitions de phases et de la dynamique des vortex. La caracterisation experimentale du piegeage dans (k,ba)bio 3 par des mesures de susceptibilite alternative et de magneto-optique a montre que les vortex sont pieges de facon volumique. Nous avons etudie la transition reseau/verre par des mesures de diffraction de neutrons. Cette transition se traduit par la disparition de l'intensite diffractee liee a l'enchevetrement des vortex et est egalement visible dans l'aimantation par l'effet papillon. L'etude de la dynamique des vortex dans (k,ba)bio 3, au voisinage de la transition reseau/verre et jusqu'a la transition solide/liquide, a ete realisee grace a des mesures de susceptibilite alternative qui permettent d'acceder aux caracteristiques e-j et offrent une large fenetre d'etude. Le passage dans la phase desordonnee ne modifie pas le fluage (bien decrit par le regime small bundle de la theorie du fluage collectif elastique). On observe une decroissance de l'exposant lorsque la taille des paquets de vortex est de l'ordre de celle entre deux dislocations. Le fluage serait alors un fluage (plastique) collectif de dislocations. L'introduction de defauts colonnaires engendre une diminution de la phase liquide (confinement des vortex). Les mesures d'aimantation presentent une anomalie au champ de piegeage efficace maximal et la disparition de l'effet papillon. L'etude du fluage des vortex a mis en evidence l'existence d'un regime rarement mesure de double kink.
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Harneit, Wolfgang. "Étude de l'état mixte du supraconducteur (K,Ba)BiO3 par mesures magnétiques." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10156.
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Nous avons etudie l'etat mixte du supraconducteur cubique kbabio a l'aide de mesures inductives sur monocristaux. La totalite du diagramme des phases de ce compose est experimentalement accessible (tc = 30k, hc2 = 32t) et l'interpretation des resultats est simplifiee du fait de son caractere isotrope. Outre les methodes traditionnelles (vsm, souid) de mesure du courant critique et de relaxation, une methode de champs pulses a ete employee pour explorer le regime des temps courts. Le piegeage des vortex dans kbabio est bien decrit par la theorie du piegeage collectif : le piegeage est lie aux fluctuations spatiales du parametre d'ordre (delta-tc-pinning). Les regimes de piegeage par paquets de vortex ont ete mis en evidence. Le fluage des vortex ne peut pas etre totalement decrit dans le cadre de deformations elastiques du reseau de vortex mais fait probablement appel a des effets plastiques lies a la proximite d'une transition verre-liquide. L'effet papillon (second maximum dans le cycle d'hysteresis) est egalement present dans kbabio. Les explications generalement utilisees (lois d'echelle pour les forces de piegeage, decouplage 2d-3d, fluage elastique ou plastique) ne permettent pas d'expliquer totalement cet effet qui parait etre lie a un phenomene d'enchevetrement des vortex.
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Sirota, Ben. "Synthesis and Characterization of ZnO and Bi2O3 Nanowires Grown by Magnetron Sputtering." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/766.
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Nanowires of Zinc oxide and bismuth oxide were grown on silicon substrates using vapor-liquid-solid (VLS) and unbalanced magnetron sputtering. Characterization using x-ray diffraction (XRD) and scanning electron microscopy (SEM) was conducted to investigate how growth conditions influence the structural and morphological properties of the materials. Optical properties were investigated using photoluminescence (PL), direct absorption spectra and cyclic voltammetry. The physical properties of sputtered ZnO were found to be dependent on oxygen flow rate, temperature, and the initial foreign metal catalysis seed layer. Nanowires were grown using a two-step process whereby an initial Au layer was deposited followed by Zn with oxygen. Doped ZnO-TiO2 nanostructures were created by sputtering Ti and Zn simultaneously. Homo- and hetero-structured ZnO-ZnO and ZnO-TiO2 were created using additional sputtering cycles. A systematic approach was taken to produce nanoarrays of Bi2O3 by adjusting initial seed layer thickness and oxygen flow rates. A two step process involving variable oxygen flow rates was found to create the highest density of Bi2O3 nanowires in the array. Top-view and cross-sectional SEM micrographs suggested that the resulting Bi2O3 nanowires were approximately 300 nm in length with diameters of 100 nm at the base and 30 nm at the top. Investigation into the growth method suggests a self-catalytic VLS-like process. Degradation tests using rhodamine 6G dye were compared to SEM images. Samples of ZnO and Bi2O3 displayed a direct correlation between nanowire density and photocatalytic efficiency.
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Webster, Nathan A. S. "New fluorite-type Bi2O3-based solid electrolytes : characterisation, conductivity and crystallography." University of Western Australia. School of Biomedical and Chemical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0092.
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[Truncated abstract] New, double-doped, Bi2O3-based materials in the Bi2O3 Ln2O3 PbO (Ln = La, Nd, Er and Yb) and Bi2O3 WO3 PbO systems were prepared using solid-state reactions. For the Bi2O3 Er2O3 PbO and Bi2O3 Yb2O3 PbO systems, the air-quenchable compositional domain of the fcc fluorite-type phase was partially established. Temperature dependent conductivity measurements were performed on these quenched-in fluorite-type materials using AC impedance spectroscopy. Conductivity at 750[degrees Celsius] generally increased with increasing Pb2+/Ln3+ and decreasing (Ln3++Pb2+)/Bi3+ ratios. The material (BiO1.5)0.70(ErO1.5)0.15(PbO)0.15 had a conductivity of 0.66 [plus-minus] 0.05 S cm-1 at 750[degrees Celsius], placing it among the most highly conductive Bi2O3-based materials, and was the best new fluorite-type material from a combined conductivity and structural stability viewpoint. Some of the new materials in the Bi2O3 La2O3 PbO and Bi2O3 Nd2O3 PbO systems appeared to have the quenched-in fluorite type structure based on powder X-ray diffraction data. These materials had very high conductivities at 750[degrees Celsius] of `~ 1 S cm-1, but underwent rapid symmetry lowering transformations during heating, thus making them unsuitable for use as solid electrolytes. The fluorite-type structure was not air-quenchable in the Bi2O3 WO3 PbO system, for the compositions synthesised. Room temperature neutron powder diffraction data were collected for quenched-in fluorite-type materials in the (BiO1.5)0.80(LnO1.5)0.20-x(PbO)x, Ln = Er and Yb, x = 0, 0.03, 0.06 and 0.09, and (BiO1.5)0.97-y(ErO1.5)y(PbO)0.03, y = 0.27, 0.17 and 0.12, series. ... This suggests that Pb2+ dopant cations occupy face-centre positions in the fcc unit cell, and the Pb2+ lone pair electrons are likely to be orientated towards an oxide ion vacancy in an adjacent tetrahedral site. Pb2+/oxide ion vacancy interactions affect the migration of oxide ions/oxide ion vacancies through the structure, and are responsible for the significantly larger activation energy for oxide ion migration in the Pb2+-doped materials relative to the Pb2+-free materials. For example, the activation energies of (BiO1.5)0.80(ErO1.5)0.20-x(PbO)x, x = 0.03 and 0.06, were 1.50 [plus-minus] 0.02 and 1.54 [plus-minus] 0.02 eV, respectively, while the activation energy for (BiO1.5)0.80(ErO1.5)0.20 was 1.25 [plus-minus] 0.04 eV. Long-term annealing of the quenched in fluorite-type materials in the Bi2O3 Er2O3 PbO and Bi2O3 Yb2O3 PbO systems at 500 and 600[degrees Celsius] resulted in conductivity lowering structural transformations, making these materials unsuitable for practical use as solid electrolytes at these temperatures. For example, the materials (BiO1.5)0.80(ErO1.5)0.20-x(PbO)x, x = 0.03, 0.06 and 0.09, underwent a fluorite-type to tetragonal transformation during annealing at 500[degrees Celsius] due to <100> oxide ion vacancy ordering, and the rate of conductivity decay at 500[degrees Celsius] increased with increasing Pb2+/Er3+ ratio. Long-term annealing experiments at 500[degrees Celsius] performed on air quenched (Bi2O3)0.705(Er2O3)0.245(WO3)0.050 showed that the disordered fluorite-type structure of this material was not fully stabilised, as evidenced by the presence of superlattice reflections in selected area electron diffraction patterns for the material annealed for 2000 hours, and a gradual conductivity decay after ~ 150 hours annealing.
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MATOS, Lucyene Nascimento. "Estudo de fases cristalinas no sistema Bi2O3-Tb4O7." Universidade Federal de Goiás, 2009. http://repositorio.bc.ufg.br/tede/handle/tde/821.
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Previous issue date: 2009-08-25A systematic study concerning the crystalline phases in the Bi2O3-rich region of the system Bi2O3-Tb4O7 was made. X-ray powder diffraction method, differential thermal analysis (DTA) and differential scanning calorimetry (DSC) were used in the study of the obtained crystalline phases. Sixteen samples with composition in the range of 4.21 to 33.33 mol% of Tb4O7 were synthesized at 800oC by solid state reaction synthesis. Three distinct crystalline phases were initially identified: a tetragonal phase in the composition range of 4.21 to 5.69 mol% of Tb4O7, a cubic phase for compositions between 6.12 and 29.03 mol% of Tb4O7, and a monoclinic one with 33.33 mol% of Tb4O7. The thermal stability of these compositions was rigorously investigated and the results shown that they are metastable phases in almost all studied range. Under thermal annealing at 500oC, tetragonal phase undergoes decomposition into two phases, monoclinic and rhombohedral ones. The cubic phase, under the same thermal annealing, decomposes partially into a rhombohedral one, except for the interval between 25.0 and 29.1 mol% of Tb4O7. In this case, there was not decomposition under thermal annealing at 500oC during 373 hours, suggesting the cubic phase is stable in this composition range. The monoclinic phase was also tested concerning its thermal stability, but no phase transition was verified. The existence of a possible composition range in the system Bi2O3-Tb4O7 with stable cubic -Bi2O3 type structure is a new and promise result, because of the high ionic conductivity presented by this phase
Um estudo sistemático das fases cristalinas na região mais rica em óxido de bismuto no sistema Bi2O3-Tb4O7 foi realizado. As técnicas de Difração de Raios X pelo método do pó, Análise Térmica Diferencial (DTA) e Calorimetria Diferencial de Varredura (DSC) foram utilizadas no estudo das fases cristalinas obtidas. Dezesseis amostras com composição entre 4,21 e 33,33 mol% de Tb4O7 foram preparadas através de síntese por reação no estado sólido a 800oC. Três fases cristalinas distintas foram inicialmente identificadas: uma tetragonal, presente nas composições entre 4,21 e 5,69 mol% de Tb4O7, uma cúbica, para as composições entre 6,12 e 29,03 mol% de Tb4O7 e uma monoclínica com composição de 33,33 mol% de Tb4O7. Essas composições foram rigorosamente testadas quanto à sua estabilidade térmicas e os resultados indicaram que elas são metaestáveis em quase todo o intervalo investigado. Sob tratamento térmico a 500oC, a fase tetragonal se decompôs em duas fases, uma romboédrica e outra monoclínica. A fase cúbica, sob o mesmo tratamento térmico, se decompôs parcialmente em uma fase romboédrica, exceto para o intervalo compreendido entre 25,0 e 29,1 mol% de Tb4O7. Neste caso não houve decomposição sob tratamento térmico a 500oC durante 373 horas, indicando que a fase cúbica é estável neste intervalo de composição. A fase monoclínica também foi testada quanto à sua estabilidade, não tendo sido verificada nenhuma transição estrutural. A existência de uma possível faixa de composição no sistema Bi2O3-Tb4O7 com estrutura cúbica do tipo -Bi2O3 estável é um resultado inédito e promissor devido ela apresentar elevada condutividade iônica
Book chapters on the topic "Oxyde de bismuth Bi2O3"
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Slavov, Stanislav, and Zheng Jiao. "Bismuth-Titanate Bi2Ti2O7 Crystallization in the Bi2O3/TiO2/SiO2/Nd2O3 System." In NATO Science for Peace and Security Series B: Physics and Biophysics. Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-024-1298-7_36.
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Munhoz, Pedro Marcio, Fernando Codelo Nascimento, Leonardo G. A. Silva, Bruno Caravelas Gary, and Wilson Aparecido Parejo Calvo. "SIMULATION OF RADIATION ATTENUATION IN POLYMER MATRIX COMPOSITE WITH EPOXY RESIN, REINFORCED WITH CARBON FIBER AND DISPERSION OF BISMUTH OXIDE (Bi2O3) NANOPARTICLES." In Ingeniería: Innovación, ciencia y tecnología 2. Atena Editora, 2023. http://dx.doi.org/10.22533/at.ed.0132321118.
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Adrián De la Torre-Martínez, Francisco, Efren Delgado, María Dolores Josefina Rodríguez Rosales, Hiram Medrano-Roldán, Javier López-Miranda, and Damián Reyes-Jáquez. "Prediction of Solubility and Miscibility Parameters of Bismuth-Arsenic Complex and Amorphous Mineral Compounds Using Molecular Dynamics Simulation." In Bismuth-Based Nanostructured Materials [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106316.
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Bismuth is one of the most difficult impurities to remove in mining concentrates and low concentrations generate problems in silver and copper refineries. Therefore, financial penalties are established when concentrations exceed 0.05%. Some researchers had used arsenic to remove bismuth with results of up to 52% of extraction. Unfortunately, this mechanism is not yet fully understood. The objective of this research was to obtain the solubility parameters of amorphous mineral compounds, including bismuth-based compounds, through computational simulation using molecular dynamics. The composition of the mineral sample was determined by X-ray diffraction and the crystalline species were obtained and modeled using Materials Studio software. The nanostructures were optimized by an energy minimization methodology using the Broyden-Fletcher-Goldfarb-Shanno algorithm and were validated using the figure of merit equation and density. Simulations were performed using the Universal Force Field at constant pressure and temperature. The results of the minerals identified in the sample were compared with arsenic trioxide, indicating miscibility between As2O3 and Bi2O3, possible miscibility with 10 other minerals, and immiscibility with the rest. The results indicate that As2O3 can be successfully used for the removal of Bi2O3 without a negative effect on the recovery of other minerals of higher commercial value.
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RANGAVITTAL, N., T. N. GURU ROW, and C. N. R. RAO. "A study of cubic bismuth oxides of the type Bi26−XMXO40−δ (M = Ti, Mn, Fe, Co, Ni or Pb) related to γ-Bi2O3." In World Scientific Series in 20th Century Chemistry. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812835734_0009.
Full textConference papers on the topic "Oxyde de bismuth Bi2O3"
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Traylor, Jennifer D., and Walter T. Pawlewicz. "Optical and Durability Properties of Bi2O3, Cr2O3, HfO2, Ta2O5, Y2O3, and ZrO2." In Optical Interference Coatings. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oic.1992.otue5.
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The data in this paper were compiled from information collected from over 10 individual coating runs to provide the optical designer optical constants for six oxide thin film materials over the 0.6 – 12.0 µm wavelength region. Data are included for bismuth oxide (Bi2O3), chromium oxide (Cr2O3), hafnium oxide (HfO2), tantalum pentoxide (Ta2O5), yttrium oxide (Y2O3), and zirconium oxide (ZrO2). In addition, the durability of each film has also been examined.
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Chen, Rui, Cheng-Xin Li, and Chang-Jiu Li. "Plasma-Sprayed (Bi2O3)0.705 (Er2O3)0.245 (WO3)0.05 Electrolyte for Intermediate-Temperature Solid Oxide Fuel Cells (IT-SOFCs)." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0440.
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Abstract Stabilized bismuth oxide with fluorite structure is considered a promising electrolyte material for intermediate temperature solid-oxide fuel cells (SOFCs) due to its high oxygen ion conductivity. The ternary system, Bi2O3-Er2O3-WO3, is of particular interest because it is ionically conductive as well as thermally stable. This study investigates the quality of Bi2O3-Er2O3-WO3 (EWSB) electrolyte produced by plasma spraying. The phase structure and cross-sectional microstructure of plasma-sprayed EWSB were characterized by XRD and SEM. The as-sprayed EWSB was found to have a dense microstructure with well bonded lamellae. XRD analysis showed the formation of EWSB with δ-phase and a trace of β-phase, while the β-phase disappeared after annealing at 750°C for 10h. Electrical property tests revealed that the plasma-sprayed electrolyte also had excellent ionic conductivity (0.26 S cm-1 at 750 °C), making it a strong candidate for use in SOFCs at intermediate temperatures.
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Mohammed SHAREEF, Amjed, A. Wesam ALMUFTI, and Ali Abdulamear AL-AZAWY. "IMPACT OF BISMUTH OXIDE NANOPARTICLES ON GAMMA RAY BUILDUP FACTOR MEASUREMENTS." In VII. INTERNATIONAL SCIENTIFIC CONGRESSOF PURE,APPLIEDANDTECHNOLOGICAL SCIENCES. Rimar Academy, 2023. http://dx.doi.org/10.47832/minarcongress7-21.
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This research includes the practical results obtained for the gamma ray Buildup factor in addition to the mean free path, the effective atomic number and the density of the composite material for the radiation protection. Shields fabricated from a base material of unsaturated polyester in addition to nano bismuth oxide (Bi2O3) as a reinforced material with different concentrations (15%, 25%, 35 %, 45%) with a certain thickness to evaluate these shields' efficiency to protect against ionizing radiation. Use of the scintillation detector (NaI (Tl)) with an ionizing radiation source (60Co). The results showed that the best concentration used represents the lowest value of the Buildup factor which is the best measure and also the mean free path decreases with increasing concentration of the reinforced material in the prepared shield, whereas the effective atomic number and density of the prepared shield increase with increasing concentration of the reinforced material in the prepared shield
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Prokofiev, Victor V., Alexei A. Kamshilin, and Timo Jääskäläinen. "The growth and studies of photorefractive Bi12TiO20 single crystals." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cwf43.
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Photorefractive crystals of the sillenites (Bi12GeO20, Bi12SiO20, Bi12TiO20) have the promising applications in optical information processing, including spatial light modulators, optical memories, phase conjugation, image inversion, and optical interconnects.1 In comparison to other sillenities, bismuth titanium oxide (Bi12TiO20, BTO) exhibits a higher sensitivity for red lights that permit the use of a cheap HeNe laser. In addition, BTO crystals have a lower optical activity ρ, which is favourable for many applications. However, some technological problems (the incongruent melting of Bi12TiO20, the high tendency of Bi2O3-containing melts to the supercooling, etc.) created difficulties for producing large single crystals of high optical quality.
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Chen, Rui, Xiao-Tao Luo, Li Zhang, Di Wang, Cheng-Xin Li, and Chang-Jiu Li. "Performance of Plasma-Sprayed Bi2O3–Er2O3–WO3 for Intermediate-Temperature Solid Oxide Fuel Cells (IT-SOFCs)." In ITSC 2023. ASM International, 2023. http://dx.doi.org/10.31399/asm.cp.itsc2023p0604.
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Abstract The previous results have shown that dense bismuth oxidebased electrolytes can be fabricated simply by plasma spraying owing to their low melting point. In this study, the Bi2O3– Er2O3–WO3 electrolyte of high ionic conductivity was deposited by the cost-effective plasma spraying to assemble the SOFC for examining its electrochemical performance. The SOFC cell consisted of FeCr24.5 metal support, NiO-YSZ anode, 10 mol% scandium oxide-stabilized zirconium oxide (ScSZ) electrolyte, (Bi2O3)0.705 (Er2O3)0.245 (WO3)0.05 (EWSB) electrolyte, and La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode. The ScSZ electrolyte interlayer was introduced between the anode and EWSB electrolyte to hinder the reduction of EWSB in the anode environment. NiO-YSZ, ScSZ, EWSB, and LSCF were deposited by plasma spraying on the metal support which was prepared by a press-forming-sintering process. The NiO-YSZ/ ScSZ/ EWSB/ LSCF single cell assembled with the as-sprayed ScSZ presented an open circuit potential of 0.90V at 600 °C and the maximum power density of 1130 mW cm-2 at 750 °C, 450 mW cm-2 at 650 °C, and 128 mW cm-2 at 550 °C. The plasma sprayed ScSZ electrolyte was then densified through impregnating using yttrium and zirconium nitrate solutions followed by annealing treatment. The single cell assembled with the densified ScSZ presented an open circuit potential up to 1.004V at 600 °C and the maximum power density of 1356 mW cm-2 at 750 °C, 619 mW cm-2 at 650 °C, and 163 mW cm-2 at 550 °C. The performance of the cell was significantly improved by the post-spray densification treatment of the ScSZ electrolyte. The present result shows that the high performance NiO-YSZ/ScSZ/EWSB/LSCF cell at intermediate temperatures can be successfully fabricated by plasma spraying.
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Besson, C., J. M. C. Jonathan, G. Pauliat, G. Roosen, and J. C. Launay. "Differences in the photorefractive behaviour of various B.G.O. crystals." In Photorefractive Materials. Optica Publishing Group, 1987. http://dx.doi.org/10.1364/prm.1987.wb3.
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Various applications such as optical data processing or laser beam stearing have been developed using Bismuth Silicone Oxyde (Bi12SiO20) or Bismuth Germanium Oxyde (Bi12GeO20) However, much remains to be done to understand in which way the chemical composition and the structure of the crystals, changes their photorefractive behaviour. This is why our two labs developed on the one hand the growth of BGO crystals (with various chemical compositions, dopants and annealing conditions) and in the other hand, the optical determination of their photorefractive parameters.
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Stepanova, I. V., O. B. Petrova, K. S. Serkina, and L. M. Savenko. "Effect of CeO2 on bismuth active centers in Bi2O3-GeO2 glasses." In 2020 International Conference Laser Optics (ICLO). IEEE, 2020. http://dx.doi.org/10.1109/iclo48556.2020.9285774.
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Sadovskaya, L. Ja, G. X. Sokolianskii, and V. P. Avramenko. "Photoelectric Properties of Bi2TeO5 Single Crystals." In Photorefractive Materials, Effects, and Devices II. Optica Publishing Group, 1993. http://dx.doi.org/10.1364/pmed.1993.thb.13.
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Shen, Yejiang, Qiuhua Nie, Tiefeng Xu, Shixun Dai, and Xiang Shen. "Effect of Bi2O3 on spectroscopic properties of Er3+ -doped tellurite bismuth glasses for broadband optical amplifiers." In 2006 4th IEEE International Conference on Industrial Informatics. IEEE, 2006. http://dx.doi.org/10.1109/indin.2006.275815.
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