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Dissertations / Theses on the topic 'Bismuth powder'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Kim, Hyungchan. "Low temperature sintering of nanosized ceramic powder YSZ-bismuth oxide system /." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092765117.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xxvi, 249 p.; also includes graphics (some col.). Includes bibliographical references (p. 241-249).

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2

Pierrat, Patrick. "Élaboration de poudres thermoélectriques du type Bi-Sb-Te par mécanosynthèse : mise en forme et caractérisation." Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL147N.

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Le laboratoire étant spécialisé dans l'élaboration de monocristaux de matériaux thermoélectriques du type Bi-Sb-Te, nous avons envisagé la mécanosynthèse comme une méthode simple et peu couteuse. Á partir des éléments purs Bi, Sb et Te les composés binaires Bi2Te3 et Sb2Te3 ont été élaborés. La cinétique de formation de ces composés a été suivie. Puis nous avons envisagé l'élaboration du composé ternaire Bi8Sb32Te60 correspondant à la meilleure composition (figure de mérite maximale) pour les monocristaux de type P. Deux voies d'élaboration ont été envisagées: soit à partir des éléments purs B

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3

Martin, Lopez Rocío. "Alliages semiconducteurs Bi-Sb élaborés par mécanosynthèse : mise en forme et caractérisation thermoélectrique." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL051N.

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Les solutions solides Bi1-x Sbx monocristallines sont les meilleurs matériaux thermoélectriques pour la réfrigération à basses températures. Néanmoins leur structure lamellaire induit une forte aptitude au clivage qui réduit les propriétés mécaniques des alliages. Leur utilisation sous forme polycristalline permet d'améliorer ce défaut. Au cours de ce travail, nous avons choisi la mécanosynthèse parmi les différentes techniques de métallurgie de poudres pour élaborer des polycristaux homogènes en un temps raisonnable. Nous avons réalisé des alliages riches en bismuth avec x = 7, 10, 12, 15 et

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4

Banerjee, D., P. Dhara, K. Chatterjee, K. Kargupta, and S. Ganguly. "Thermoelectric Characterization of Nanostructures of Bismuth Prepared by Solvothermal Approach." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35251.

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Nanostructured thermoelectric materials being an emerging area of research bismuth (Bi) nanostructures have been developed by solvothermal approach with a change of solvent. Structural characterization revealed that nanorods and nanospheres like structures were generated in the process when the solvent used were only ethylene glycol (EG) and ethylene glycol with absolute ethanol (AE) in the ratio of 1:1 respectively. Electrical properties viz. conductivity (σ) and thermoelectric power(S) have been measured in the temperature range 300K to 400K. From the observed value of σ and S power fac

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5

Smith, Thomas. "Studies of p-type semiconductor photoelectrodes for tandem solar cells." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14522.

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Photoelectrodes and photovoltaic devices have been prepared via multiple thin film deposition methods. Aerosol assisted chemical vapour deposition (AACVD), electrodeposition (ED), chemical bath deposition (CBD) and doctor blade technique (DB) have been used to deposit binary and ternary metal oxide films on FTO glass substrates. The prepared thin films were characterised by a combination of SEM (Scanning Electron Microscopy), powder X-ray diffraction, mechanical strength tests and photochemical measurements. Nickel oxide (NiO) thin films prepared by AACVD were determined to have good mechanica

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6

Kalita, Mridu P. "Development of bismuth doped silica fibres for high power sources & long wavelength generation from ytterbium doped fibre lasers." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/185965/.

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A detailed study of fabrication and characterisation of bismuth (Bi) doped silica optical fibre has been investigated. Three different fibre fabrication techniques were applied to study the possible influence on Bi-luminescence: modified chemical vapour deposition (MCVD) and the solution doping technique, MCVD chemicalin- crucible deposition technique and the powder-in-tube (PIT) technique. Spectroscopic absorption and Bi luminescence and fluorescence decay properties under different pumping wavelengths and with different host glass compositions are presented and provide important information

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7

Vacinova, Jitka. "Etudes structurales des oxydes de platine par les méthodes de diffusion anomale et de D. A. F. S." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10185.

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Nous avons entrepris les etudes structurales de deux systemes d'oxydes de platine: ba/pt/o et bi/pb/pt/o par diffraction electronique et par diffraction des rayons x. Nous avons developpe les techniques experimentales de diffraction anomalous fine structure (dafs) et de diffraction anomale afin de les appliquer aux etudes de materiaux sous forme de monocristaux ou sous forme de poudres. Pour les mesures de dafs nous avons propose deux procedures experimentales differentes: le mode de diffraction multi-monochromatique et le mode de diffraction dispersive. L'information selective des diffuseurs

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8

Hareland, Mathias. "CONQUER CORROSION : Key issues of the lead-cooled fast reactor design." Thesis, Uppsala universitet, Tillämpad kärnfysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-149755.

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The lead-cooled fast reactor (LFR) is one of the concepts of the Generation IV reactorsystems. There are some issues that have to be solved before a research orcommercial LFR can be built. The objective of this thesis was to identify these keyissues and analyse them by studying results from previous research: choice of fuel,corrosion on structural materials and corrosion/erosion on pumps.The major fuel candidates for the LFR are MOX fuel (Mixed OXide fuel), metallic fuel,nitride fuel and carbide fuel. Nitride fuel has desirable properties but its production ismore difficult than for MOX fuel.M

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9

Savelli, Guillaume. "Etude et développement de composants thermoélectriques à base de couches minces." Phd thesis, Université Joseph Fourier (Grenoble), 2007. http://tel.archives-ouvertes.fr/tel-00257433.

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La thermoélectricité est une science remise au goût du jour depuis quelques années en tant que source de récupération d'énergie. Dans cette optique, l'étude et la conception de dispositifs thermoélectriques à base de films minces se justifient parfaitement : en effet, les faibles dimensions de ces modules, de l'ordre du cm2, permettent leur intégration et leur utilisation dans des domaines nombreux et variés, tels l'industrie automobile, l'environnement du corps humain, l'alimentation de capteurs sans fil... Ainsi, ces travaux ont permis la réalisation et la caractérisation de plusieurs module

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10

Jarchovský, Petr. "Výpočetní simulace urychlovačem řízeného jaderného reaktoru pro transmutaci vyhořelého jaderného paliva." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221209.

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This master’s thesis deals with usage of burn-up (spent) nuclear fuel in nuclear power plants of next generation – accelerator driven transmutation plants which is produced in current nuclear power plants. This system could significantly reduce the volume of dangerous long-lived radioisotopes and moreover they would be able to take advantage of its great energy potential due to fast neutron spectrum. In the introduction are listed basic knowledge and aspects of spent nuclear fuel along with its reprocessing and the possibility of further use while minimizing environmental impact. As another po

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11

Weng, Jui-chung, and 翁瑞宗. "Preparation and Photoreactive Properties of Bismuth Oxide Composite Powder." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/ga2qtf.

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碩士<br>逢甲大學<br>材料科學所<br>100<br>In the present study, bismuth oxide (Bi2O3) powders were prepared from bismuth nitrate (BiNH) by spray pyrolysis (SP) and hydrothermal (HT) processes. The influences of both processes on the characteristics and photoreactive behaviors of the resulting powders were investigated. Subsequently the Bi2O3 powder was doped with various amounts (0, 5, 10 and 20 at%) of zinc (Zn) to modify its characteristics, photoreactive and catalytic properties. The powders were then deposited onto a diffusor of UV-LED (ultraviolet light-emitting diode) to inhibit the UV light emitted

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12

Chang, Cheng-Ju, and 張盛貯. "Synthesis and Characterisation of Bismuth Telluride Powder by Hydrothermal Method." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/64374795772535044898.

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碩士<br>國立高雄應用科技大學<br>化學工程系碩士班<br>96<br>In the study, BiCl3 and Te were used as raw materials, and water, EDTA and NaBH4 were used as solvent, chelating agent and reducing agent, respectively. Under medium-high temperature and high pressure conditions, the Bi2Te3 powders were synthesized by hydro-thermal method. And then, the Bi2Te3 bulks were prepared by sintering technology. The effect of various preparation factors including the synthesis time, the synthesis temperature, the molar ratio of EDTA/BiCl3 and others on the stability, the microstructure and other properties of the Bi2Te3 powders wa

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13

Weng, Po-Hao, and 翁伯豪. "Applications of Bismuth Oxide Powder on Package of White-light LEDs." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/85380759602307737873.

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碩士<br>逢甲大學<br>電機工程所<br>100<br>In this thesis, a design of RGB phosphor-converted white light-emitting diode was proposed which is coated with a layer of photocatalyst on the surface of LED package. Utilize the characteristic of absorption spectrum in blue and UV regions of bismuth oxide photocatalyst, the blue light and UV leakage problems can be significantly reduced. In addition, the coating layer of photocatalyst can properly play a role of diffuser to ease the glare problem. The bismuth oxide photocatalyst was synthesized by spray pyrolysis. The energy gap of the synthesized Bi2O3 photocat

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14

黃丞均. "Bismuth/Hafnium Oxide Composite Powder and Its applications as Dental Filling and Radiopacifying Materials." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/27616620389519020023.

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碩士<br>逢甲大學<br>材料科學與工程學系<br>104<br>Mineral trioxide aggregate (MTA) has been classified as calcium silicate-based cement and its extensive endodontic therapy is attributed to its excellent advantages of biocompatibility, sealing ability, radiopacity, and alkalinity. MTA contains Portland cement as the main component and bismuth oxide (Bi2O3) as the radiopacifier. In the present study, hafnia was added into bismuth oxide to enhance the practical application of MTA. In the present study, bismuth/hafnium oxide composite powder were synthesized from bismuth nitrate and hafnium sulfate with various

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15

TU, Kuan-hung, and 杜冠宏. "Effect of Pr, Gd Coating on Photocatalytic Activity and Upconversion Behavior of Bismuth Oxide Powder." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/56970065914316459726.

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碩士<br>逢甲大學<br>材料科學與工程學系<br>103<br>Semiconductors can be expected to exhibit excellent photocatalytic effects under light irradiation at a wavelength longer than 600 nm by coating lanthanide. In our study, bismuth oxide particles were first synthesized via thermal decomposition； and subsequently, lanthanides, such as praseodymium (Pr) and gadolinium (Gd), were coated in different concentrations (1 mol% and 3 mol%) onto the surface of the bismuth oxide by precipitation and photochemical reduction methods. Finally, the as-coated powders were calcined at 600°C in air for 1 h to improve the crystal

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16

Garg, Rohini. "Structural, Ferroelectric, Piezoelectric and Phase Transition Studies of Lead Free (Na0.5Bi0.5)TiO3 Based Ceramics." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3446.

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Ferroelectric materials, especially the polycrystalline ceramics, are very promising material for a variety of applications such as high permittivity dielectrics, ferroelectric memories, piezoelectric sensors, piezoelectric/electrostrictive transducers, electrooptic devices and PTC thermistors. Among the ferroelectric based piezoelectric ceramics the lead–zirconate-titanate Pb(Zr1-xTix)O3 (PZT) have dominated transducer and actuator market due to its excellent piezoelectric and dielectric properties, high electromechanical coupling, large piezoelectric anisotropy, ease of processing and low co

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17

Garg, Rohini. "Structural, Ferroelectric, Piezoelectric and Phase Transition Studies of Lead Free (Na0.5Bi0.5)TiO3 Based Ceramics." Thesis, 2013. http://etd.iisc.ernet.in/2005/3446.

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Ferroelectric materials, especially the polycrystalline ceramics, are very promising material for a variety of applications such as high permittivity dielectrics, ferroelectric memories, piezoelectric sensors, piezoelectric/electrostrictive transducers, electrooptic devices and PTC thermistors. Among the ferroelectric based piezoelectric ceramics the lead–zirconate-titanate Pb(Zr1-xTix)O3 (PZT) have dominated transducer and actuator market due to its excellent piezoelectric and dielectric properties, high electromechanical coupling, large piezoelectric anisotropy, ease of processing and low co

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18

Lo, Shih-Hsiang, and 羅仕翔. "Studies of superparamagnetic property of bismuth nanoparticles synthesized by low-power pulsed laser deposition." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/70185253359936051776.

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碩士<br>國立東華大學<br>物理學系<br>103<br>In this experiment, bismuth (Bi) nanoparticles have been prepared with different size and oxidation by using pulsed laser deposition (PLD) and tube furnace chemical vapor deposition chamber, then were characterized by field-emission scanning electron microscopy (FESEM), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that the bismuth nanoparticles size range from about 30 to120 nm and mainly composed of bismuth element. The lattice system of the particle is hexagonal system. The surface of bismuth nanoparticles was oxidized

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19

HUANG, SHENG-XIONG, and 黃聖雄. "Fabrication of Flexible Thin Film Thermoelectric Generator with Current-Assisted Hot Pressing on Bismuth-Telluride-Based Powders." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/83q65t.

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碩士<br>國立中正大學<br>化學工程研究所<br>107<br>The objective of this research is to fabricate the planar flexible thermoelectric generator by current-assisted hot pressing treatment. The thermoelectric materials are bismuth telluride based ternary compounds in the procedure. The thermoelectric thin films are prepared via coating method with an average particle size of 5 μm powders. After that, the current-assisted hot pressing treatment is employed and the PU compostie films are coated to improve the thermoelectric properties of the films and the heat transfer inside the generator. In the hope of the maxim

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20

Bali, Ashoka. "Study of Thermoelectric Properties of Lead Telluride Based Alloys and Two-Phase Compounds." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/2950.

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The growing need of energy worldwide has lead to an increasing demand for alternative sources of power generation. Thermoelectric materials are one of the ‘green energy sources’ which convert directly heat into electricity, and vice–versa. The efficiency of this conversion is dependent on ‘figure of merit’ (z T), which depends on the material’s Seebeck coefficient (S), electrical resistivity (ρ) and thermal conductivity (κ) through the relation z T=S2T/ρκ, where T is the temperature. High values of z T lead to high efficiency, and therefore, z T must be maximized. Lead telluride is well–establ

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21

Bali, Ashoka. "Study of Thermoelectric Properties of Lead Telluride Based Alloys and Two-Phase Compounds." Thesis, 2014. http://hdl.handle.net/2005/2950.

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The growing need of energy worldwide has lead to an increasing demand for alternative sources of power generation. Thermoelectric materials are one of the ‘green energy sources’ which convert directly heat into electricity, and vice–versa. The efficiency of this conversion is dependent on ‘figure of merit’ (z T), which depends on the material’s Seebeck coefficient (S), electrical resistivity (ρ) and thermal conductivity (κ) through the relation z T=S2T/ρκ, where T is the temperature. High values of z T lead to high efficiency, and therefore, z T must be maximized. Lead telluride is well–establ

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