An Oxygen-Rich Pyrochlore with Fluorite Composition
An Oxygen-Rich Pyrochlore with Fluorite Composition
复制标题
一种含有萤石成分的富氧烧绿石
DOI：
10.1006/jssc.1999.8347
复制
发表时间：
1999
影响因子：
5.4
通讯作者：
P. Bruce
中科院分区：
文献类型：
--
作者：
J. Thomson;A. Armstrong;P. Bruce
摘要采用中温加热法在烧绿石Ce_2Zr_2O_7中引入氧。已获得接近萤石（Ce2Zr2O7.97）的组合物，同时保留烧绿石阳离子有序。而在萤石中，所有的氧离子都在四面体位置，富氧烧绿石在一些四面体位置和一个新的三角形位置的占用表现出空缺。后者来自烧绿石阳离子阵列内八面体32e位点的氧离子。
Abstract Oxygen has been intercalated into the pyrochlore Ce2Zr2O7 by heating under oxygen at a moderate temperature. A composition approaching fluorite (Ce2Zr2O7.97) has been obtained while retaining pyrochlore cation ordering. Whereas in flourite 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.