Results 191 to 200 of about 18,795 (238)
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Electronic and optical properties of yttria
Physical Review Letters, 1990The electronic structure and bonding in the ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$ crystal is completely elucidated by first-principles self-consistent band-structure and optical calculations. Results agree well with experiments. The unique type of bonding in ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$ is emphasized; it does not support the fully ionic picture ...
, Ching, , Xu
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Influence of yttria content on the preparation of nanocrystalline yttria-doped zirconia
Journal of Materials Research, 1995Nanocrystalline zirconia doped with 0–10 mol % Y2O3 has been prepared by a combustion synthesis process, followed by a rapid densification process. The concentration of Y2O3 in the as-reacted zirconia appeared to have a significant influence on the reduction of the crystallite size, in the combustion temperature range studied (450 °C–550 °C), as well ...
Dai Huang +2 more
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Luminescent enhancement in europium-doped yttria nanotubes coated with yttria
Applied Physics Letters, 2006Europium-doped yttria nanotubes were coated with yttria by a simple two-step hydrothermal method, forming the Y2O3:Eu3+∕Y2O3 core-shell composite. Remarkable improvement of photoluminescence was observed in the core-shell composite under both violet and ultraviolet excitations.
Xue Bai +9 more
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Solid State Ionics, 1992
Abstract The degree of solid solubility between yttria and calcia was measured, in the yttria-rich region, over the temperature range 1200 to 2000°C. X-ray diffraction results indicate that as much as 12.4 mol% calcia can be dissolved in yttria at 2000°C. No solid solution between the two oxides was observed below 1400°C.
J BROWN, T ETSELL
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Abstract The degree of solid solubility between yttria and calcia was measured, in the yttria-rich region, over the temperature range 1200 to 2000°C. X-ray diffraction results indicate that as much as 12.4 mol% calcia can be dissolved in yttria at 2000°C. No solid solution between the two oxides was observed below 1400°C.
J BROWN, T ETSELL
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Combustion synthesis of yttria
Journal of Materials Chemistry, 1995Fine-particle, sinter-active yttria has been prepared by combustion of a redox compound, Y(N2H3COO)3·3H2O and mixtures of Y(N2H3COO)3·3H2O–NH4NO3 or NH4ClO4 as well as yttrium nitrate and hydrazine-based fuels. The fineparticle nature of the combustion-derived yttria has been investigated using powder density, particle size and BET surface area ...
Sambandan, Ekambaram, Patil, Kashinath C
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Thermal expansion coefficient of yttria stabilized zirconia for various yttria contents
Solid State Ionics, 2005Abstract Thermal expansion coefficients of yttria stabilized zirconia(YSZ) with the Y 2 O 3 content of 3, 6, 8 and 10 mol% were measured using a push-rod type dilatometer in the temperature range from 103 to 876 K. The thermal expansion coefficient of YSZ decreased with the increase of the Y 2 O 3 content.
H HAYASHI +5 more
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Optics and Spectroscopy, 2008
Pulsed cathodoluminescence of samples of nominally pure yttria—commercially available powder, nanopowder prepared from it, and ceramics sintered from this nanopowder—is studied in the range 380–850 nm. The luminescence spectra at room temperature exhibit broad bands at λ ≈ 437 and 487 nm and series of narrow bands that are located in the blue (435–510 ...
V. V. Osipov +2 more
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Pulsed cathodoluminescence of samples of nominally pure yttria—commercially available powder, nanopowder prepared from it, and ceramics sintered from this nanopowder—is studied in the range 380–850 nm. The luminescence spectra at room temperature exhibit broad bands at λ ≈ 437 and 487 nm and series of narrow bands that are located in the blue (435–510 ...
V. V. Osipov +2 more
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Phase relationships in the yttria-rich part of the yttria-zirconia system
Journal of Materials Science, 1977Phase equilibria in yttria-zirconia mixtures containing not less than 50 mol % YO1.5 have been studied between 1200 and 2200° C. The solubility of zirconia in yttria is shown to decrease with increasing temperature: the miscibility gap between the zirconia (fluorite) and yttria (type C rare earth) solid solutions extends from 64 to 75 mol % YO1.5 at ...
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Polymeric Precursors for Yttria
MRS Proceedings, 1994ABSTRACTPolymers that can be easily processed into fibers, films, or bodies are excellent precursors for ceramics with useful morphologies. The ideal preceramic polymer not only has proper physical properties (e.g. solubility or fusibility) for processibility but also decomposes at
Allen W. Apblett +5 more
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Interaction of NiO with yttria-stabilized zirconia
Solid State Ionics, 1997 As-prepared and heat treated plasma-produced 8 and 10 mol% yttria-stabilized zirconia (YSZ) powders doped with 0, 5, 10 and 75 mol% NiO have been investigated by XRD. The as-prepared powders are mixtures of metastable tetragonal and cubic phases but they
Linderoth, Søren, Kuzjukevics, A.
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