Results 161 to 170 of about 4,365 (205)
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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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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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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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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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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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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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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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Journal of The Electrochemical Society, 1951
The phase relationships in the zirconia‐yttria system have been established up to 2000°C. The addition of 0 to 5 mole per cent yttria lowers the temperature at which zirconia transforms from the tetragonal to the monoclinic form. From 7 to 55 mole per cent yttria is soluble in zirconia and this solid solution is cubic (stabilized zirconia). A two‐phase
Pol Duwez, Frank H. Brown, Francis Odell
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The phase relationships in the zirconia‐yttria system have been established up to 2000°C. The addition of 0 to 5 mole per cent yttria lowers the temperature at which zirconia transforms from the tetragonal to the monoclinic form. From 7 to 55 mole per cent yttria is soluble in zirconia and this solid solution is cubic (stabilized zirconia). A two‐phase
Pol Duwez, Frank H. Brown, Francis Odell
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Dense and High Purity Yttria Coatings by APS with a New Yttria Powder
International Thermal Spray Conference, 2013Abstract This study compares the morphology, porosity, and purity of yttria powders produced by spray drying, spray drying and sintering (SDS), and spray drying and plasma fusion (SDPF). The surface morphology of each type of powder is examined by SEM.
A. Allimant, D. Billières, H. Wallar
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Journal of the American Ceramic Society, 1975
Phase equilibria in the yttria‐hafnia system were investigated by high‐temperature and room‐temperature X‐ray diffraction. The HfO 2 transformation, solid solution limits, and liquidus temperatures are given. A tentative phase diagram is proposed.
D. W. STACY, D. R. WILDER
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Phase equilibria in the yttria‐hafnia system were investigated by high‐temperature and room‐temperature X‐ray diffraction. The HfO 2 transformation, solid solution limits, and liquidus temperatures are given. A tentative phase diagram is proposed.
D. W. STACY, D. R. WILDER
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