Bibliographies thématiques / ZrO2, SiO2, Bi2O3

Littérature scientifique sur le sujet « ZrO2, SiO2, Bi2O3 »

Auteur : Grafiati

Publié le 1 avril 2023

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Articles de revues sur le sujet "ZrO2, SiO2, Bi2O3"

Akiyama, Yuji, Masayuki Takada, Ai Fukumori, Yuuki Sato et Shinzo Yoshikado. « Effect of Zr-Addition on Electric Degradation Characteristics of ZnO Varistors ». Key Engineering Materials 421-422 (décembre 2009) : 209–12. http://dx.doi.org/10.4028/www.scientific.net/kem.421-422.209.

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ZnO varistors of the excellent tolerance characteristics for electrical degradation were made by adding Bi2O3-MnO2-Co3O4-Cr2O3-SiO2-Sb2O3-NiO in ZnO. The tolerance characteristics for electrical degradation were evaluated by changing amount of ZrO2-additive. The evaluation methods are voltage-current characteristics, X-ray diffraction, scanning electron microscope, and energy dispersion X-ray spectroscopy. Monoclinic and tetragonal ZrO2 and the compounds originated in Zr were observed at both grain boundaries and triple points. Moreover, the compounds originated in both Zr and Sb improved the tolerance characteristics for electrical degradation. On the other hand, especially monoclinic ZrO2 deteriorated the tolerance characteristics for electrical degradation. It is one key factor of the improvements of the tolerance characteristics for electrical degradation that the mobility of oxide ions or interstitial Zn2+ ions was hindered by forming the compounds contained Zr, Sb, Si, and, Bi atoms.

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Alférez Vega, Fabio Leonardo, J. J. Olaya et Jorge Bautista Ruiz. « Synthesis and corrosion resistance of SiO2-TiO2-ZrO2-Bi2O3 coatings spin-coated on Ti6Al4V alloy ». Ceramics International 44, n^o 2 (février 2018) : 2123–31. http://dx.doi.org/10.1016/j.ceramint.2017.10.161.

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Kumar, G. Ravi, et M. C. Rao. « Structural and photoluminescence investigations of Cr3+ mixed Li2O—Bi2O3—ZrO2—SiO2 glass ceramics for optoelectronic device application ». Optik 181 (mars 2019) : 721–31. http://dx.doi.org/10.1016/j.ijleo.2018.12.110.

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Crum, J. V., M. J. Schweiger, P. Hrma et J. D. Vienna. « Liquidus Temperature Model for Hanford High-Level Waste Glasses with High Concentrations of Zirconia ». MRS Proceedings 465 (1996). http://dx.doi.org/10.1557/proc-465-79.

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ABSTRACTA study was conducted on glasses based on a simulated transuranic waste with high concentrations of ZrO2and Bi2O3 to determine the compositional dependence of primary crystalline phases and liquidus temperature (TL). Starting from a baseline composition, glasses were formulated by changing mass fractions of Al2O3, B2O3, Bi2O3, CeO2, Li2O, Na2O, P2O5, SiO2, and ZrO2, one at a time, while keeping the remaining components in the same relative proportions as in the baseline glass. Liquidus temperature was measured by heat treating glass samples for 24 h in a uniform temperature furnace. The primary crystalline phase in the baseline glass and the majority of the glasses was zircon (ZrSiO4). A change in the concentration of certain components (Al2O3, ZrO2, Li2O, B2O3 and SiO2) changed the primary phase to baddeleyite (ZrO2), while cerium oxide (CeO2) precipitated from glasses with more than 3 wt% CeO2. Zircon TL was strongly increased by Al2O3, Zrb2 and CeO2, and slightly by P2O5 and SiO2; decreased strongly by Li2O and Na2O and moderately by B2O3. A first-order model was constructed for TL as a function of composition for zircon primary crystalline phase glass.

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Seo, Dongho, Sangsun Park, Byeong-Mu Lim, Yong-Soo Cho et Yong-Gun Shul. « Multicomponent Proton Conducting Ceramics of SiO2–TiO2–ZrO2–P2O5–Bi2O3 for an Intermediate Temperature Fuel Cell ». Journal of Fuel Cell Science and Technology 8, n^o 1 (4 novembre 2010). http://dx.doi.org/10.1115/1.4002313.

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The multicomponent proton conducting ceramics SiO2–TiO2–ZrO2–P2O5 (STZP) and SiO2–TiO2–ZrO2–P2O5–Bi2O3 with three different compositions (STZPBi3, STZPBi10, and STZPBi15) were synthesized via a wet chemical route. These prepared materials showed good thermal stability up to around 900°C by TG/DTA analyses. Introduction of optimum quantity of bismuth as a sintering aid into the samples contributed to enhance the densification of microstructure, which is essential for the utilization of proton conducting ceramics in fuel cells operated at elevated temperature. The proton conductivity of STZP was 3.6×10−5 S/cm at 80°C and that of STZPBi10 was 4.6×10−3 S/cm at 180°C. The fuel cell performances using STZP and STZPBi10 were implemented at 80°C and up to 230°C, respectively. The maximum power density was 0.03 mW/cm2 at 80°C for the STZP sample and 2.5 mW/cm2 at 150°C for the STZPBi10 sample under wet hydrogen and dry oxygen. The reduction of CO poisoning on platinum catalyst was demonstrated in fuel cell operating at temperatures of 180°C, 200°C, and 230°C.

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El-Shall, M. Samy, W. Slack, D. Hanley et D. Kane. « Characterization of Nanoscale Particles Produced by Laser Vaporization / Condensation in a Diffusion Cloud Chamber ». MRS Proceedings 351 (1994). http://dx.doi.org/10.1557/proc-351-369.

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ABSTRACTNanoscale metal oxide particles have been synthesized by using a novel method which combines laser vaporization of metal targets with controlled condensation in a diffusion cloud chamber. The following oxides have been synthesized: ZnO, SiO2, Fe2O3, Bi2O3, PdO, NiO, AgO, TeO, Sb2O3, TiO2, ZrO2, A12O3, CuO, In203, SnO2, V2O5 and MgO. With this method, the size of the particles can be conveniently controlled by careful control of the degree of supersaturation which is accomplished by adjusting the temperature gradient, total pressure, and partial pressure of the metal vapor generated by laser vaporization in a diffusion cloud chamber. The microscale structures of the SiO2 and A1203 particles exhibit interesting web-like matrices with a significant volume of vacancies. These materials may have special applications in catalysis and as reinforcing agents for liquid polymers.

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Xu, Chong, Qin Zhou, Wei-Ya Huang, Kai Yang, Yong-Cai Zhang, Tong-Xiang Liang et Zhao-Qing Liu. « Constructing Z-scheme β-Bi2O3/ZrO2 heterojunctions with 3D mesoporous SiO2 nanospheres for efficient antibiotic remediation via synergistic adsorption and photocatalysis ». Rare Metals, 21 janvier 2022. http://dx.doi.org/10.1007/s12598-021-01897-9.

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