Results 151 to 160 of about 4,365 (205)

Mesoporous Yttria-Zirconia and Metal-Yttria-Zirconia Solid Solutions for Fuel Cells

Advanced Materials, 2000
Marc Mamak
exaly   +2 more sources

Mechanical, Thermal, And Optical Properties Of Yttria And Lanthana-Doped Yttria

SPIE Proceedings, 1989
Yttria (yttrium sesquioxide, Y203) and lanthana-doped yttria (typically with 9 mole-percent La2O3) are being developed as infrared window materials. This paper presents a comprehensive review of mechanical, thermal, and optical properties.
William J. Tropf, Daniel C. Harris
openaire   +2 more sources

Synthesis of yttria nanopowders for transparent yttria ceramics

Optical Materials, 2006
Abstract This paper describes a precipitation process for synthesizing nanocrystalline yttria powder and sintering transparent yttria ceramics. Hydroxide precursor of Y 2 O 3 with an approximate composition of Y 2 (OH) 5 NO 3  · H 2 O was synthesized by using ammonia water as precipitant and yttrium nitrate as the starting salt.
Lei Wen, Xudong Sun, Qi Lu, Guoxiang Xu, Xiaozhi Hu   +4 more
openaire   +1 more source

Subsurface segregation of yttria in yttria stabilized zirconia

Journal of Applied Physics, 2002
The segregation behavior in 3 and 10 mol % polycrystalline yttria stabilized zirconia (YSZ), calcined at temperatures ranging from 300 to 1600 °C, is characterized using low-energy ion scattering (LEIS). In order to be able to separate the Y and Zr LEIS signals, YSZ samples have been prepared using isotopically enriched Z94rO0 instead of natural ...
M. de Ridder, R. G. van Welzenis, A. W. Denier van der Gon, H. H. Brongersma, S. Wulff, W.-F. Chu, W. Weppner   +6 more
openaire   +1 more source

Hydrothermal Synthesis of Yttria-Stabilized Zirconia Nanocrystals with Controlled Yttria Content

Inorganic Chemistry, 2015
In this study, we demonstrate for the first time the hydrothermal synthesis of yttria-stabilized zirconia (YSZ) nanocrystals with controlled yttria content (x = 3-12 mol %; xYSZ) with negligible aggregation from aqueous solution. The nanocrystals were grown via the hydrothermal treatment of basic Zr(IV) and Y(III) carbonate complex aqueous solutions in
Kazuyoshi, Sato, Kazuya, Horiguchi, Taku, Nishikawa, Sadahiro, Yagishita, Kazuo, Kuruma, Takeshi, Murakami, Hiroya, Abe   +6 more
openaire   +2 more sources

Alumina and Yttria Powder and Yttria Coatings Made by Ultrasonic Spray Pyrolysis

Chemical Vapor Deposition, 2013
AbstractUltrasonic spray pyrolysis is used to produce metal oxide powders (alumina, yttria, and mixtures of these) from nitrate precursors at temperatures below 500 °C. Moreover, yttria powder coatings on soda‐lime glass and fused silica substrates are generated. The as‐prepared powders and coatings are examined using scanning electron microscopy (SEM),
Santos Abreu, Alexandre, Knoll, Matthias, Moosburger-Will, Judith, Konrad, Armin, Tidecks, Reinhard, Horn, Siegfried R.   +5 more
openaire   +1 more source

Yttria concentration dependence of tensile strength in yttria-stabilized zirconia

Journal of Alloys and Compounds, 2004
Abstract Tensile and bending tests were performed for ZrO2 polycrystals stabilized with 2.6–10 mol % Y2O3. There is no significant difference in the isothermal Young’s modulus of all the compositions. Both the tensile and bending strengths of PSZ are markedly higher than those of FSZ.
Junya Kondoh, Hirohisa Shiota, Katsuhiro Kawachi, Toshio Nakatani   +3 more
openaire   +1 more source

Electronic and optical properties of yttria

Physical Review Letters, 1990
The 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
openaire   +2 more sources

Microencapsulation of silicon nitride particles with yttria and yttria-alumina precursors

Journal of Materials Research, 1990
Procedures are described to deposit uniform layers of yttria and yttria-alumina prccursors on fine powders and whiskers of silicon nitride. The coatings were produced by aging at elevated temperatures aqueous systems containing the silicon nitride core particles, yttrium and aluminum nitrates, and urea.
Ajay K. Garg, Lutgard C. De Jonghe
openaire   +1 more source

Influence of yttria content on the preparation of nanocrystalline yttria-doped zirconia

Journal of Materials Research, 1995
Nanocrystalline 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, K.R. Venkatachari, Gregory C. Stangle   +2 more
openaire   +1 more source