An Oxygen-Rich Pyrochlore with Fluorite Composition

✍ Scribed by James B. Thomson; A. Robert Armstrong; Peter G. Bruce

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 231 KB
• Volume: 148
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8347

✦ Synopsis

Oxygen has been intercalated into the pyrochlore Ce 2 Zr 2 O 7 by heating under oxygen at a moderate temperature. A composition approaching 6uorite (Ce 2 Zr 2 O 7.97 ) has been obtained while retaining pyrochlore cation ordering. Whereas in 6ourite all oxide ions are in tetrahedral sites, the oxygen-rich pyrochlore exhibits vacancies in some tetrahedral sites and occupancy of a new trigonal site. The latter arises from oxide ions in octahedral 32e sites within the pyrochlore cation array.