Oxygen Release Behavior of CeZrO4Powders and Appearance of New Compoundsκand t*

Shinya Otsuka-Yao-Matsuo, Takahisa Omata, Noriya Izu, Haruo Kishimoto

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)47-54
Number of pages8
JournalJournal of Solid State Chemistry
Volume138
Issue number1
DOIs
Publication statusPublished - 1998 Jun 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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