TY - JOUR
T1 - Oxygen Release Behavior of CeZrO4Powders and Appearance of New Compoundsκand t*
AU - Otsuka-Yao-Matsuo, Shinya
AU - Omata, Takahisa
AU - Izu, Noriya
AU - Kishimoto, Haruo
N1 - Funding Information:
The authors are grateful to Dr. N. Umesaki and Professor N. Ohtori, who helped us use the Raman scattering apparatus at Osaka National Research Institute, AIST. We also thank Mitsui Metal Co., Ltd., for the supply of CeO2 and ZrO2 powders and H. Miyagishi for his experimental assistance. The authors are grateful for support by Grant-in-Aid for General Scientific Research 08875139 from the Ministry of Education, Science and Culture, Japan.
PY - 1998/6
Y1 - 1998/6
N2 - In order to clarify the chemical properties of the single phases, t′ andκ, in the CeO2-ZrO2system, evolved-oxygen gas analyses (EGA) were performed by heating in a reducing gas and successive oxidations of the resulting pyrochlore phase in O2gas were carried out repeatedly. The rate of oxygen release was analyzed as a function of temperature and time. When the pyrochlore phase was oxidized at 873 K, theκphase appeared. When theκphase was annealed in O2gas at 1323 or 1423 K, a new tetragonal phase, t*, appeared, which released oxygen at the highest temperatures. The oxygen release behavior of theκphase significantly changed, and was dependent on the history of the sample, specifically, whether it had experienced the t*phase. The oxygen release behavior of t′ depended on the temperature where the t′ had gained oxygen after losing a small amount of oxygen. Powder XRD and Raman scattering techniques have been applied to characterize the oxygen release behavior of these t′, t*, andκphases.
AB - In order to clarify the chemical properties of the single phases, t′ andκ, in the CeO2-ZrO2system, evolved-oxygen gas analyses (EGA) were performed by heating in a reducing gas and successive oxidations of the resulting pyrochlore phase in O2gas were carried out repeatedly. The rate of oxygen release was analyzed as a function of temperature and time. When the pyrochlore phase was oxidized at 873 K, theκphase appeared. When theκphase was annealed in O2gas at 1323 or 1423 K, a new tetragonal phase, t*, appeared, which released oxygen at the highest temperatures. The oxygen release behavior of theκphase significantly changed, and was dependent on the history of the sample, specifically, whether it had experienced the t*phase. The oxygen release behavior of t′ depended on the temperature where the t′ had gained oxygen after losing a small amount of oxygen. Powder XRD and Raman scattering techniques have been applied to characterize the oxygen release behavior of these t′, t*, andκphases.
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U2 - 10.1006/jssc.1998.7753
DO - 10.1006/jssc.1998.7753
M3 - Article
AN - SCOPUS:0001846879
VL - 138
SP - 47
EP - 54
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 1
ER -