Bibliografías temáticas / CaWO4

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Literatura académica sobre el tema "CaWO4"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 7 de febrero de 2022

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Artículos de revistas sobre el tema "CaWO4"

1

Li, Chunxia, Cuikun Lin, Xiaoming Liu y Jun Lin. "Nanostructured CaWO4, CaWO4:Eu3+ and CaWO4:Tb3+ Particles: Sonochemical Synthesis and Luminescent Properties". Journal of Nanoscience and Nanotechnology 8, n.º 3 (1 de marzo de 2008): 1183–90. http://dx.doi.org/10.1166/jnn.2008.18169.

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Nanostructured CaWO4, CaWO4:Eu3+, and CaWO4:Tb3+ phosphor particles were synthesized via a facile sonochemical route. X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, photoluminescence, low voltage cathodoluminescence spectra, and photoluminescence lifetimes were used to characterize the as-obtained samples. The X-ray diffraction results indicate that the samples are well crystallized with the scheelite structure of CaWO4. The transmission electron microscopy and field emission scanning electron microscopy images illustrate that the powders consist of spherical particles with sizes from 120 to 160 nm, which are the aggregates of even smaller nanoparticles ranging from 10 to 20 nm. Under UV light or electron beam excitation, the CaWO4 powder exhibited a blue emission band with a maximum at 430 nm originating from the WO2−4 groups, while the CaWO4:Eu3+ powder showed red emission dominated by 613 nm ascribed to the 5D0 → 7F2 of Eu3+, and the CaWO4:Tb3+ powders showed emission at 544 nm, ascribed to the 5D4 → 7F5 transition of Tb3+. The PL excitation and emission spectra suggest that the energy is transferred from WO2−4 to Eu3+CaWO4:Eu3+ and to Tb3+ in CaWO4:Tb3+. Moreover, the energy transfer from WO2−4 to Tb3+ in CaWO4:Tb3+ is more efficient than that from WO2−4 to Eu3+ in CaWO4:Eu3+. This novel and efficient pathway could open new opportunities for further investigating the novel properties of tungstate materials.
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Li, Chunxia, Cuikun Lin, Xiaoming Liu y Jun Lin. "Nanostructured CaWO4, CaWO4:Eu3+ and CaWO4:Tb3+ Particles: Sonochemical Synthesis and Luminescent Properties". Journal of Nanoscience and Nanotechnology 8, n.º 3 (1 de marzo de 2008): 1183–90. http://dx.doi.org/10.1166/jnn.2008.349.

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Wang, Zhenling, Guangzhi Li, Zewei Quan, Deyan Kong, Xiaoming Liu, Min Yu y Jun Lin. "Nanostructured CaWO4, CaWO4 : Pb2+ and CaWO4 : Tb3+ Particles: Polyol-Mediated Synthesis and Luminescent Properties". Journal of Nanoscience and Nanotechnology 7, n.º 2 (1 de febrero de 2007): 602–9. http://dx.doi.org/10.1166/jnn.2007.101.

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Nano-submicrostructured CaWO4, CaWO4 : Pb2+ and CaWO4 : Pb3+ particles were prepared by polyol method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectra (FT-IR), thermogravimetry-differential thermal analysis (TG-DTA), photoluminescence (PL), cathodoluminescence (CL) spectra and PL lifetimes. The results of XRD indicate that the as-prepared samples are well crystallized with the scheelite structure of CaWO4. The FE-SEM images illustrate that CaWO4 and CaWO4 : Pb2+ and CaWO4 : Tb3+ powders are composed of spherical particles with sizes around 260, 290, and 190 nm respectively, which are the aggregates of smaller nanoparticles around 10–20 nm. Under the UV light or electron beam excitation, the CaWO4 powders exhibits a blue emission band with a maximum at about 440 nm. When the CaWO4 particles are doped with Pb2+, the intensity of luminescence is enhanced to some extent and the luminescence band maximum is red shifted to 460 nm. Tb3+-doped CaWO4 particles show the characteristic emission of Tb3+ 5D4–7FJ (J = 6 – 3) transitions due to an energy transfer from WO42− groups to Pb3+.
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4

Wang, Zhenling, Guangzhi Li, Zewei Quan, Deyan Kong, Xiaoming Liu, Min Yu y Jun Lin. "Nanostructured CaWO4, CaWO4 : Pb2+ and CaWO4 : Tb3+ Particles: Polyol-Mediated Synthesis and Luminescent Properties". Journal of Nanoscience and Nanotechnology 7, n.º 2 (1 de febrero de 2007): 602–9. http://dx.doi.org/10.1166/jnn.2007.18049.

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Nano-submicrostructured CaWO4, CaWO4 : Pb2+ and CaWO4 : Pb3+ particles were prepared by polyol method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectra (FT-IR), thermogravimetry-differential thermal analysis (TG-DTA), photoluminescence (PL), cathodoluminescence (CL) spectra and PL lifetimes. The results of XRD indicate that the as-prepared samples are well crystallized with the scheelite structure of CaWO4. The FE-SEM images illustrate that CaWO4 and CaWO4 : Pb2+ and CaWO4 : Tb3+ powders are composed of spherical particles with sizes around 260, 290, and 190 nm respectively, which are the aggregates of smaller nanoparticles around 10–20 nm. Under the UV light or electron beam excitation, the CaWO4 powders exhibits a blue emission band with a maximum at about 440 nm. When the CaWO4 particles are doped with Pb2+, the intensity of luminescence is enhanced to some extent and the luminescence band maximum is red shifted to 460 nm. Tb3+-doped CaWO4 particles show the characteristic emission of Tb3+ 5D4–7FJ (J = 6 – 3) transitions due to an energy transfer from WO42− groups to Pb3+.
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5

Mai, M. y C. Feldmann. "Microemulsion-based synthesis and luminescence of nanoparticulate CaWO4, ZnWO4, CaWO4:Tb, and CaWO4:Eu". Journal of Materials Science 47, n.º 3 (28 de septiembre de 2011): 1427–35. http://dx.doi.org/10.1007/s10853-011-5923-8.

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YANG, YUGUO, XUPING WANG y BING LIU. "SYNTHESIS OF CaWO4 AND CaWO4:Eu MICROSPHERES BY PRECIPITATION". Nano 09, n.º 01 (enero de 2014): 1450008. http://dx.doi.org/10.1142/s1793292014500088.

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Nearly monodisperse CaWO 4 and CaWO 4: Eu 3+ microspheres have been synthesized in large scale by a surfactant-assisted solution route, in which cetyltrimethyl ammonium bromide (CTAB) is used. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and photoluminescence (PL) were used to characterize the resulting samples. The results of XRD indicate that the CaWO 4 and CaWO 4: Eu 3+ samples have the scheelite structures. The growth process of these nearly monodisperse spheres with an average diameter around 3.2 μm has been examined. The results of FTIR indicate that CTAB plays an important role in the formation of microspheres. The CaWO 4 microspheres exhibit a blue emission band with a maximum at 423 nm. But the CaWO 4: Eu 3+ microspheres exhibit a red emission band with a maximum at 623 nm.
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7

Patil, Prasad Narayan, Uma Subramanian y M. Jeyakanthan. "Enhanced blue emission of CaWO4 in BaWO4/CaWO4 nanocomposite". Journal of Materials Science: Materials in Electronics 31, n.º 9 (31 de marzo de 2020): 7260–75. http://dx.doi.org/10.1007/s10854-020-03298-7.

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Liu, Chunxia, Lixia Yang, Dan Yue, Mengnan Wang, Lin Jin, Boshi Tian, Chunyang Li y Zhenling Wang. "Synthesis, Morphology Control and Luminescent Properties of Rare Earth Ion-Doped CaWO4 Microstructures". Journal of Nanoscience and Nanotechnology 16, n.º 4 (1 de abril de 2016): 4029–34. http://dx.doi.org/10.1166/jnn.2016.11895.

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Rare earth ions (Tb3+, Eu3+) doped CaWO4 microstructures were synthesized by a facile hydrothermal route without using any templates and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum. The results indicate that the asprepared samples are well crystallized with scheelite structure of CaWO4, and the average diameter of the microstructures is 2∼4 μm. The morphology of CaWO4:Eu3+ microstructures can be controllably changed from microspheres to microflowers through altering the doping concentration of Eu3+ from 3% to 35%, and the microflowers are constructed by a number of CaWO4:Eu3+ nanoflakes. Under the excitation of UV light, the emission spectrum of CaWO4:Eu3+ is composed of the characteristics emission of Eu3+ 5D0-7FJ (J = 1, 2, 3, 4) transitions, and that of CaWO4:Tb3+ is composed of Tb3+ 5D4-7FJ (J = 6, 5, 4, 3) transitions. Both of the optimal doping concentrations of Tb3+ and Eu3+ in CaWO4 microstructures are about 5%.
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9

Liu, Bi Tao y Lin Lin Peng. "Photoluminescent Properties of Na+, Bi3+ Co-Doped CaWO4: Eu3+ Phosphor for PDPs". Applied Mechanics and Materials 341-342 (julio de 2013): 229–32. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.229.

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The photoluminescent properties of Na, Bi co-doped CaWO4:Eu3+ phosphor under vacuum ultraviolet (VUV) region excited was investigated. A red emission of CaWO4:Eu3+ can be observed under 147 nm excitation. It was also found that the photoluminescence intensity of Na doped CaWO4:Eu3+ would be enhanced than the un-doped phosphors due to Na+ ions would act as a charge compensator and it can restrict the generation of defects in CaWO4:Eu3+. Additionally, the photoluminescence enhancement of Na+, Bi3+ co-doped CaWO4:Eu3+ should due to the energy transfer between WO42-, Bi3+ and Eu3+, and Bi3+ ions would act as a medium for the energy transfer, via WO42-Bi3+Eu3+. These are expected to be applying in plasma display panels.
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Zhao, Jian Ling, Yong Liao, Li Ye Zhao, Xiao Jing Yang, Wei Yu y Xi Xin Wang. "Influences of Reaction Conditions on the Morphology and Properties of CaWO4 Films Prepared by Anodization". Materials Science Forum 809-810 (diciembre de 2014): 654–59. http://dx.doi.org/10.4028/www.scientific.net/msf.809-810.654.

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CaWO4 films were prepared in saturated Ca(OH)2 solution through constant-voltage anodization method. Influences of reaction time, voltage and temperature on the morphology, crystal structure and photoluminescence properties were studied through scanning electron microscopy (SEM), X-ray diffractometer (XRD) and photoluminescence measurements (PL). Results show that the as-prepared CaWO4 film is of tetragonal phase, the reaction conditions affect the morphology, grain size and photoluminescence properties greatly. The CaWO4 film anodized at 20V, 45°C for 40 min is flat, uniform and dense with stronger photoluminescence intensity. The formation process of CaWO4 films has also been discussed.
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Tesis sobre el tema "CaWO4"

1

Ninković, Jelena. "Investigation of CaWO4 crystals for simultaneous phonon-light detection in the CRESST dark matter search". [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974435767.

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Erdogan, Metehan. "Recovery Of Tungsten From Tungsten Bearing Compounds". Phd thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615540/index.pdf.

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Extensive research in recent years has failed to develop any essentially new method of large scale tungsten production. A new tungsten powder production technique from calcium tungstate (CaWO4) has recently been reported. In this thesis, this technique was further explored from the aspects of electrochemical reduction mechanism and kinetics, applicability to scheelite concentrates and industrial production. Cyclic voltammetry, constant potential and constant current electrochemical reduction tests were performed to determine the reversible cell potential. Analyses of the experimental results revealed that at least 2.2 V was required to compensate the potentials for the accompanying cell reaction and the electrode polarizations. A cell reaction was proposed by associating the experimental results and the Gibbs Energy changes of the possible reactions. An experiment (mixture) design was created to optimize the process parameters of the electrochemical reduction of CaWO4 to W in molten CaCl2-NaCl eutectic mixture. Temperature, applied voltage and the length of Kanthal wire winding of the CaWO4 pellets were selected as the process parameters and allowed to vary between the predetermined minimum and maximum values. The rates of the electrochemical reductions were interpreted from the variations of current and total charge vs. time graphs under different conditions. The analysis pointed out 640oC and 2.81 V from the created mixture design for the fastest reduction and it was seen that the effect of Kanthal wire winding on the output current was less pronounced when compared to the other two parameters. Another set of experiments was performed by full factorial design to investigate the cleaning procedure needed to remove calcium containing byproducts after electrochemical reduction experiments. Three levels were determined prior to the experiments for the selected three parameters
temperature, acid concentration and exposure time. Main effect and interaction graphs for calcium percent as a function of process parameters were plotted. Calcium contents of the samples were determined by XRF measurements. A 300 g/day capacity tungsten production line was manufactured to take the process one step closer to industrialization. Problems at larger scale were addressed as incomplete reduction, oxidation of graphite and corrosion of cathode materials. After careful research, AISI 316 Ti steel was found to impart sufficient resistance to highly corrosive environment. Oxidation of graphite anode inside the cell was lowered to acceptable levels by continuous nitrogen flow. Metallic tungsten powder was obtained from rich and flotation concentrates of Uludag Etibank Volfram Plant (closed in 1989) together with mainly iron. It was seen that tungsten and iron do not make compounds at the temperatures used for reduction (600-750oC). A basic diffusion model in the electrolyte was developed to better understand the decrease in current values and incomplete reduction encountered during large scale production. The model was used to simulate the recorded current vs. time graphs of selected experiments.
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Sivers, Moritz von [Verfasser], Lothar [Akademischer Betreuer] Oberauer y Hubert [Akademischer Betreuer] Kroha. "Scintillating CaWO4 Crystals for the Direct Dark Matter Search Experiments CRESST and EURECA / Moritz von Sivers. Gutachter: Lothar Oberauer ; Hubert Kroha. Betreuer: Lothar Oberauer". München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1054753040/34.

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Münster, Andrea Ruth [Verfasser], Stefan [Akademischer Betreuer] [Gutachter] Schönert y Shawn [Gutachter] Bishop. "High-Purity CaWO4 Single Crystals for Direct Dark Matter Search with the CRESST Experiment / Andrea Ruth Münster ; Gutachter: Stefan Schönert, Shawn Bishop ; Betreuer: Stefan Schönert". München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1147968233/34.

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Strauß, Raimund Johann [Verfasser], Franz von [Akademischer Betreuer] Feilitzsch y Siegfried [Akademischer Betreuer] Bethke. "Energy-Dependent Quenching Factor Measurements of CaWO4 Crystals at mK Temperatures and Detector Prototypes for Direct Dark Matter Search with CRESST / Raimund Johann Strauß. Gutachter: Franz von Feilitzsch ; Siegfried Bethke. Betreuer: Franz von Feilitzsch". München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1043317287/34.

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Roth, Sabine [Verfasser], Franz von [Akademischer Betreuer] Feilitzsch y Andreas [Akademischer Betreuer] Ulrich. "The Potential of Neganov-Luke Amplified Cryogenic Light Detectors and the Scintillation-Light Quenching Mechanism in CaWO4 Single Crystals in the Context of the Dark Matter Search Experiment CRESST-II / Sabine Roth. Gutachter: Andreas Ulrich ; Franz von Feilitzsch. Betreuer: Franz von Feilitzsch". München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1043317341/34.

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Reghima, Meriem. "Synthèse par voie aqueuse et analyses physico-chimique des couches minces à base de soufre". Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS269/document.

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L'électronique intégrée connaît des développements importants pour des applications mettant en œuvre des capteurs en couches minces associés à une acquisition et un traitement des données appropriés. Le développement de couches minces qui peuvent être associées à des composants électroniques est un élément clé pour la mise en œuvre de nouveaux dispositifs. Un des objectifs de ma thèse est de montrer la faisabilité de couches minces de composés à base de soufre, par des techniques autres que celles mettant en jeu le vide. Ces techniques simples sont le spray et le dépôt chimique en solution aqueuse.Trois matériaux binaires et à base de soufre m'ont été proposés pour l'élaboration en couches minces par voie aqueuse, ce sont : SnS, à applications photovoltaïques, et MgS et CaS à applications dosimétriques.Le sulfure d'étain est un absorbeur utilisé dans les dispositifs photovoltaïques, connu pour ces propriétés physiques pertinentes pour cette application. Cependant, c'est un piètre conducteur et différents dopages tel que le fer, l'argent et le gallium ainsi qu'un recuit sous atmosphère contrôlé ont été réalisés dans le but d'augmenter la conductivité de ces couches minces. Il s'est avéré par la suite qu'un simple dopage des films minces de SnS n'aboutit pas à la diminution de la résistivité d'où la proposition d'un recuit sous atmosphère contrôlé dans cette étude. L'étude cristallographique révèle une amélioration cristalline avec la coexistence des deux phases pour des températures de recuit croissantes. A une certaine température, un changement de phase est noté. La transformation de phase se produit à des températures de recuit différentes pour les couches minces recuites et avec différents éléments dopants. La partie électrique étudiée par courants thermiquement stimulés montre que les pièges disparaissent pour des températures de recuit croissantes. Ce résultat a été consolidé par une augmentation progressive de l'intensité du courant d'obscurité en fonction de la température de recuit suivie d'un changement notable du processus de conduction. Ce changement observé est attribué à la transition de phase produite lors du recuit.Nous avons ensuite optimisé les paramètres de croissance des films minces de MgS et de CaSO4 à applications dans les mesures dosimétriques. Nous avons réussi par la technique de spray à élaborer des couches minces de MgS. Suivant l'analyse cristallographique et chimique, nous avons conclu à l'existence des deux matériaux : le MgSO4 en une forte proportion et le MgS en une faible proportion. La présence importante du taux d'oxygène dans les couches minces a été expliquée par le fait que la technique de croissance n'est pas sous vide d'une part et d'autre part par la présence de l'oxygène dans les réactifs. L'effet du recuit réalisé sous vide ou sous azote montre que ce matériau n'est pas stable à atmosphère ambiante et que l'élaboration de ce dernier en couches minces nécessite des techniques de fabrication plus performantes et qui mettent en jeu le vide.Par ailleurs, le CaSO4 a été élaboré par la technique de Spray. Du dopage intentionnel a été analysé afin de préciser le comportement de luminescence du matériau. Cependant, comme on a constaté que la luminescence du matériau après dopage est la même que celle du non dopé et ce quelque soit le dopage utilisé, nous pouvons conclure que la luminescence de ce composé est attribuée aux états de défauts intrinsèques.Une étude de la TL a été réalisée sur un échantillon irradié à différentes doses. Il a été noté que le signal de la TL augmente pour des doses d'irradiation croissantes.Ce travail constitue une première étape cruciale vers la maîtrise des propriétés de certaines couches minces incluses dans des dispositifs photovoltaïques et dosimétriques. Les perspectives s'ouvrent vers d'autres matériaux soufrés bien connus en dosimétrie, et pour lesquels le spray pourrait constituer une méthode de fabrication bien adaptée
This thesis reports the growth of sulfur thin films using low cost techniques other than those involving vacuum. These simple techniques are spray pyrolysis and chemical bath deposition. In this context, it is necessary to control the development of thin films. Various analyzes were performed such as: XRD, SEM, EDS, AFM, spectrophotometry and TSC. All these analyzes allowed us to improve the physical properties of thin films of SnS in photovoltaic application in a first stage and a second stage to optimize the growth parameters of dosimetric thin films.In the first part, we have elaborated tin sulphide thin films using as an absorber material in photovoltaic devices. For this, different doping such as iron, silver, and gallium as well as annealing in a controlled atmosphere have been made in order to increase the conductivity of these thin films. The doping was carried out during the growth process by adding relative concentration of the aqueous solutions containing Fe2+; Ag2+ and Ga2+ ions. It was found later that the doping of SnS thin films does not result in the decrease of resistivity. So,other physical characterizations are in progress to optimize thin films properties and particularly the resistivity by means of an appropriate heat treatment under controlled atmosphere. The XRD patterns show an increase in crystallite size with annealing temperature, correlated with an improvement in surface topography. In addition, annealing at 600°C results in the structural transition from rocksalt to orthorhombic, leading to enhanced conductivity. From TSC measurement, a gradual increase in the current intensity with increasing annealing temperature was observed. A significant change in the electrical conduction regime occurred for the film annealed at 600°C. The TSC intensity increased by 5 decades compared with that of the SnS annealed at 500°C. The SnS thin film had semiconductor electrical behavior, which can be attributed to the structural transition.During the second part of my thesis, we have optimized the growth parameters of dosimetric thin films. For this, we started with the first material the MgS using spray pyrolysis technique. Different growth parameters were varied such as the substrate temperature, the pH of the solution, the nature of the solvent and that of the carrier gas and the concentration of EDTA. Along the crystallographic analysis (XRD) and chemical (EDS), we concluded the existence of two materials: a high proportion of MgSO4 and MgS in a small proportion. The significant presence of oxygen in in thin films was explained by the fact that the growth of such compound needs a vacuum technique. Another reason may be to the presence of oxygen in the reactants. In fact, the presence of the dominant phase magnesium sulfate may be due to the little amount of the rate of the dissociation MgSO4 to release Mg2+ cation through the EDTA complexing. The effect of annealing performed under vacuum and under nitrogen atmosphere show that this material is not stable at ambient atmosphere and the development of the latter requires thin film manufacturing techniques more efficient and which involve vacuum.We then chose to prepare a second dosimeter material is CaSO4 by spray technique. Intentional doping (Sm, Mn or doubly doped such as (Cu, F), (Cu, Mn)) was analyzed to clarify the behavior of luminescence of the material. However, as it was found that the luminescence of the material after doping is the same as that in the case of undoped and whatever the doping used, we can conclude that the luminescence there is given to the states of its own defects -even and which are present in the spray solution. Hence the luminescence of the material is intrinsic. A study of the TL was performed on a sample irradiated at different doses. It was noted that the signal of the TL increases for increasing irradiation doses
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SILVA, Isis Rosane Monteiro da. "Determinação experimental de curvas de atenuação e camadas semi- redutoras do material gesso como blindagem aos raios x". Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/23483.

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CAPES
O gesso (CaSO4) é um material utilizado em grande quantidade na construção civil brasileira como estrutura física (paredes, tetos e divisórias) para delimitar espaços entre ambientes. Placas de parede de gesso não são utilizadas como blindagem, embora a aplicação destas tem sido estudada para a área de radiodiagnóstico de baixas energias com base na NCRP (National Council on Radiation Protection and Measurement) relatório 147. O objetivo deste trabalho foi estudar a utilização do gesso brasileiro como material de blindagem e estabelecer as curvas de atenuação e camadas semi-redutoras. Foram determinadas as características do gesso, tais como composição química e granulometria. Foram confeccionadas placas quadradas com dimensões de 10x10 cm² com espessuras entre 2,5mm, 5mm e 8 mm que, quando combinadas, resultaram em 10 medidas irradiadas num estudo quantitativo. No procedimento experimental, as placas foram irradiadas em um equipamento de raios X industrial PANTAK, modelo HF320, a uma distância de 50 cm do ponto focal. As medidas de atenuação do feixe de raios X foram determinadas utilizando câmara de ionização posicionada a uma distância de 1,0 m do ponto focal. As respostas da atenuação em função da espessura de gesso resultaram na obtenção de curvas de atenuação que foram utilizadas para determinar as CSR. Os resultados obtidos possibilitaram a obtenção de curvas de atenuação e camadas semi-redutoras do gesso brasileiro que servirão como base para projetos de blindagem para a área radiológica.
The gypsum (CaSO4) is a material used in large quantities in the Brazilian civil construction as physical structure (walls, roofs and office partitions) to delimit spaces between environments. The gypsum wallboards are not used as shielding, although the application of these has been studied the area radiodiagnostic of low power according to the NCRP (National Council on Radiation Protection and Measurement) report 147. The aim of this work was to use the Brazilian gypsum as shielding material for establishes the attenuation curves and half values layers (HVL). Thus, gypsum characteristics were determined, such as chemical composition and grain measurement. Square plates were prepared with fixed dimensions 10x10 cm² and thickness varying between 2.5mm, 5mm and 8 mm which, when combined, result in the 10 irradiated measures for quantitative analysis. In the experimental procedure, the plates were irradiated in an equipment of industrial machine for X-ray Pantak, Model HF320, at a distance of 50 cm from the focal point. The potential applied to the X-ray tube was 60 kV because of N60 quality which resulted in an average of 45 keV electron energy, the current was sustained constant at 10 mA. The attenuation measurements of the Xray beam were determined using ionization chamber positioned at a distance of 1.0 m from the focal point. The responses of attenuation according to the gypsum thickness resulted in obtaining attenuation curves, used to determine the HVL. The obtained results the attenuation curves of the Brazilian gypsum will serve as a basis for shielding projects in the radiological area.
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9

Freyer, Daniela. "Zur Phasenbildung und -stabilität im System Na2SO4-CaSO4-H2O". Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola&quot, 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-7606881.

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In den Untersuchungen zur Phasenbildung und -stabilität im System Na2SO4 - CaSO4 - H2O wurden die bisher existierenden Phasendiagramme für das wasserfreie System Na2SO4 - CaSO4 korrigiert. Metastabile Mischkristalle wurden bezüglich ihrer Existenzgebiete und Zusammensetzungen charakterisiert. Für den im wässrigen System stabil auftretenden Glauberit, Na2SO4 . CaSO4, wurde die Löslichkeitskonstante bis 250°C bestimmt und ist ab 100°C kleiner als bisher angenommen wurde. Zur Bestimmung der Löslichkeitskonstante wurde die Temperaturabhängigkeit der Freien Standardreaktionsenthalpie für die Zersetzung des Glauberits ermittelt. Dazu wurden die Cp-Funktionen für die an der Reaktion beteiligten Phasen Glauberit und Anhydrit, CaSO4, über Wärmekapazitätsmessungen bis 510°C bestimmt. Eine weitere Möglichkeit zur Bestimmung der Freien Standardreaktionsenthalpie durch die Ermittlung der thermodynamischen Aktivität von Na2SO4 in der Hochtemperaturmischkristallphase mit EMK-Messungen an Festkörperelektroden wurde aufgezeigt. Für das im System Na2SO4 - CaSO4 - H2O metastabile auftretende Natriumpentasalz, Na2SO4 . 5 CaSO4 . 3 H2O, wurde eine Einkristallstrukturanalyse durchgeführt und die strukturelle Verwandtschaft zum Calciumsulfat-Halbhydrtat, CaSO4 . 0,5 H2O, aufgeklärt, sowie die Bildungsbedingungen charakterisiert.
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Freyer, Daniela. "Zur Phasenbildung und -stabilität im System Na2SO4-CaSO4-H2O". [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965898660.

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Libros sobre el tema "CaWO4"

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Services, Dearborn Environmental Consulting. Treatability of wastewaters from high CaO and CaSO4 content FBC wastes. Ottawa, Ont., Canada: Environment Canada, 1986.

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Dorozhkin, Sergey V. Biocomposites and Hybrid Biomaterials of Calcium Orthophosphates (CaPO4) with Polymers. CRC Press, 2018. http://dx.doi.org/10.1201/9780429439377.

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Capítulos de libros sobre el tema "CaWO4"

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özdemir, Furkan, Metehan Erdoğan, Mustafa Elmadağlı y İshak Karakaya. "Production of Tungsten by Pulse Current Reduction of CaWO4". En Rare Metal Technology 2016, 151–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274834.ch15.

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Özdemir, Furkan, Metehan Erdoğan, Mustafa Elmadağlı y İshak Karakaya. "Production of Tungsten by Pulse Current Reduction of CaWO4". En Rare Metal Technology 2016, 151–58. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48135-7_15.

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Liu, Liang y Jilai Xue. "A Green Leaching Method of Decomposing Synthetic CaWO4 by HO-H3PO4 in Tungsten Producing Process". En Ceramic Transactions Series, 157–65. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119190042.ch15.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "CaUO4". En Structure Types. Part 5: Space Groups (173) P63 - (166) R-3m, 510–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-46933-9_397.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk y I. Savysyuk. "CaSO4∙0.5H2O". En Structure Types. Part 8: Space Groups (156) P3m1 – (148) R-3, 432. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-70892-6_233.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk y I. Savysyuk. "CaSO4∙0.5H2O". En Structure Types. Part 8: Space Groups (156) P3m1 – (148) R-3, 446. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-70892-6_245.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk y I. Savysyuk. "CaSO4∙0.5H2O β". En Structure Types. Part 9: Space Groups (148) R-3 - (141) I41/amd, 473. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02702-4_331.

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Holze, Rudolf. "Ionic conductance of CaSO4". En Electrochemistry, 780–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_738.

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Holze, Rudolf. "Ionic conductance of CaSO4 + NaCl". En Electrochemistry, 782–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_739.

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Dorozhkin, Sergey V. "Self-Setting Calcium Orthophosphate (CaPO4) Formulations". En Springer Series in Biomaterials Science and Engineering, 41–146. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-5975-9_2.

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Actas de conferencias sobre el tema "CaWO4"

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Zorenko, Yu, V. Gorbenko, T. Zorenko, V. Savchyn y A. Voloshinovskii. "Luminescent and scintillation properties of CaWO4 and CaWO4:Bi single crystalline films". En 2014 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2014. http://dx.doi.org/10.1109/omee.2014.6912438.

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Mokina, V. M., F. A. Danevich, V. V. Kobychev, R. V. Kobychev, H. Kraus, V. Mykhaylyk y I. M. Solskii. "Optimization of light collection from oxide CaWO4 scintillators". En 2014 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2014. http://dx.doi.org/10.1109/omee.2014.6912437.

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Popovici, Elisabeth-Jeanne, Mihail Nazarov, Duk Young Jeon, Laura Muresan, Tania A. Nazarova, Emil Indrea y Amalia Hristea-Simoc. "Photo- and cathodoluminescence investigation of CaWo4:Eu,Tb phosphors". En SPIE Proceedings, editado por Valentin I. Vlad. SPIE, 2004. http://dx.doi.org/10.1117/12.583062.

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Buryy, Oleh, Dmytro Vynnyk, Nataliya Demyanyshyn, Bohdan Mytsyk, Mykola Melnyk, Ivan Solskyi y Rostyslav Melnyk. "The perspectives of CaWO4 crystals using in acousto-optical modulators". En 2016 13th International Conference on Modern Problems of Radio Engineering. Telecommunications and Computer Science (TCSET). IEEE, 2016. http://dx.doi.org/10.1109/tcset.2016.7452062.

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Danevich, F. A. "Radioactive contamination of CaWO4, ZnWO4, CdWO4, and Gd2SiO5:Ce crystal scintillators". En TOPICAL WORKSHOP ON LOW RADIOACTIVITY TECHNIQUES: LRT 2004. AIP, 2005. http://dx.doi.org/10.1063/1.2060457.

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Kaur, Puneet, Atul Khanna, M. N. Singh y A. K. Sinha. "Investigation of structural and optical characteristics of CaWO4 and BaWO4 nanoparticles". En DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017034.

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Möbert, P. E. A., P. LiKamWa, B. H. T. Chai y G. Hubert. "Laser performance and frequency doubling of Nd3+-doped CaWO4 at 1.06 μm". En Advanced Solid State Lasers. Washington, D.C.: OSA, 1997. http://dx.doi.org/10.1364/assl.1997.sc12.

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Li, C. H. y Y. C. Huang. "Pulsed Intracavity Frequency-doubled CaWO4 Raman Laser for Narrow-line Sodium-yellow Radiation". En Conference on Lasers and Electro-Optics. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/cleo.2010.jtud112.

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Gruszko, Julieta, Wei Zhao y Karoline Schaeffner. "Hands on CRESST: Determining the energy dependence of the alpha band in CaWO4". En Gran Sasso Summer Institute 2014 Hands-On Experimental Underground Physics at LNGS. Trieste, Italy: Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.229.0014.

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Zakharko, Ya, A. Luchechko y I. Solskii. "Oxygen-related defects and luminescence properties of CaMoO4 single crystals and CaMoO4-CaWO4 compounds". En 2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2012. http://dx.doi.org/10.1109/omee.2012.6464887.

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