Results 191 to 200 of about 3,128 (236)
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Self-diffusion of yttrium in monocrystalline yttrium oxide: Y2O3
Journal of Solid State Chemistry, 1980Abstract Yttrium self-diffusion in monocrystalline yttrium oxide (Y2O3) is studied by means of the classical radio tracer technique. The few reliable diffusion data obtained in the temperature range 1600–1700°C lead to the following diffusion coefficient D=3.5×10 −9 exp − 72 RT ( kcal/mole ) m 2 sec −1 ...
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Infrared Properties of Yttrium Oxide
Journal of the Physical Society of Japan, 1971By using a large solar furnace, yttrium oxide crystals were made by a fusion process, and their reflectivity was measured in the spectral region 700 to 10 cm -1 , Several reststrahlen bands extending from 600 to 240 cm -1 were found. From the reflectivity curve, the parameters of seven lattice vibrations were analysed, and the optical constants in a ...
Yutaka Nigara +2 more
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Air oxidation of yttrium and some yttrium-base alloys
Journal of the Less Common Metals, 1964Abstract An investigation was made of the air oxidation behavior of yttrium metal of 99.9% purity at temperatures between 500° and 1400°C. An oxide layer formed on the metal surface affords excellent protection against oxidation up to about 875°C but this film breaks down at higher temperatures, resulting in complete failure of the specimen within a ...
J.A. Haefling +2 more
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Compressive Properties of Yttrium Oxide
Journal of the American Ceramic Society, 1996Compressive properties of polycrystalline yttrium oxide (Y 2 O 3 ) were studied by slow‐strain‐rate experiments (ε= 5.7 × 10 –6 s −1 ) between room temperature and 1600°C ...
Özer Ünal, Mufit Akinc
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Transparent yttrium oxide ceramics
Materials Research Bulletin, 1967Abstract Transparent discs of yttrium oxide, one centimeter in diameter by several millimeters thick, have been produced by hot forging under vacuum at 950°C and 10,000–12,000 psi for 48 hours. Lithium fluoride, required to produce full transparency, is eliminated during the sintering process.
R.A. Lefever, John Matsko
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Electrochemical deposition of yttrium oxide
Journal of Materials Chemistry, 2000Thin films of yttrium hydroxide were obtained from aqueous Y(NO3)3 and YCl3 salt solutions via cathodic electrodeposition. The electrodeposition yield was studied under various experimental conditions. By varying the current density, deposition time and yttrium salt concentration, the amount of the deposited material could be controlled ...
Igor Zhitomirsky, Anthony Petric
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Sintering zirconia with yttrium oxide
Refractories, 1975An investigation was carried out of the sintering of zirconia containing 4–15 mole % yttrium oxide in which it was confirmed that the sintering of the materials begins at 500°C.
A. G. Karaulov, I. N. Rudyak
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The Gel Route to Yttrium Oxide
MRS Proceedings, 1988ABSTRACTSynthesis of pure Y2O3 Powders have been performed through the sol-gel process. Stable colloids in the range of 500 Å to 2000 Å have been obtained by hydroxylation of yttrium-aquo ions performed through an anion exchange resin.The chemical nature of these sols and gels investigated by GTA, DTA and EXAFS is in close agreement with Y(OH)3nH2O ...
F. Ribot, C. Sanchez, J. Livage
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The Kinetics of the Chlorination of Yttrium Oxide
Metallurgical and Materials Transactions B, 2009The chlorination kinetics of Y2O3 with chlorine to produce YOCl was studied by thermogravimetry over a temperature range from 575 °C to 975 °C. The influence of convective mass transfer into the boundary layer surrounding the sample, gaseous diffusion into the sample pores, partial pressure of chlorine, and temperature on the reaction rate were ...
J.P. Gaviría, A.E. Bohé
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Oxidation of Zirconium-Yttrium Alloys
Advances in X-ray Analysis, 1964AbstractThe phase and elemental distributions on zirconium alloys containing 5, 10, 25, 35, and 50 at.%. yttrium, oxidized in dry air at 1200 and 1600°C, have been studied by X-ray diffraction, fluorescence, and electron-microprobe techniques. Zirconium-yttrium alloys, which are entirely solid at 1200°C, and zirconium 5 and 25 at.% yttrium alloys ...
D. I. Phalen +2 more
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