Oxygen Release Behavior of CeZrO4Powders and Appearance of New Compoundsκand t
Oxygen Release Behavior of CeZrO4Powders and Appearance of New Compoundsκand t
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CeZrO4粉末的释氧行为及新化合物的出现κ和t
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
H. Kishimoto
中科院分区：
文献类型：
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作者：
S. Otsuka;T. Omata;N. Izu;H. Kishimoto
为了阐明单相 t' 和 κ 的化学性质，在 CeO2-ZrO2 体系中，通过在还原性气体中加热进行析出氧气分析 (EGA)，并在氧气中反复进行所得烧绿石相的连续氧化。分析氧气释放速率随温度和时间的变化。当烧绿石相在873 K被氧化时，出现κ相。当κ相在1323或1423 K的氧气中退火时，出现了新的四方相t*，它在最高温度下释放出氧气。 κ相的氧释放行为显着改变，并且取决于样品的历史，特别是它是否经历过t*相。 t'的释氧行为取决于t'在失去少量氧气后获得氧气的温度。粉末 XRD 和拉曼散射技术已用于表征这些 t'、t* 和 κ 相的氧释放行为。
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.