CRYSTAL-STRUCTURES OF GADOLINIUM-DOPED AND YTTRIUM-DOPED BARIUM CERATE

被引：50
作者：
KNIGHT, KS [1 ]
SOAR, M [1 ]
BONANOS, N [1 ]
机构：
[1] BP RES CO,SUNBURY RES CTR,SUNBURY TW16 7LN,MIDDX,ENGLAND
来源：
JOURNAL OF MATERIALS CHEMISTRY | 1992年 / 2卷 / 07期
关键词：
NEUTRON DIFFRACTION; POWDER DIFFRACTION; PEROVSKITE; SOLID ELECTROLYTE; IONIC CONDUCTIVITY;
D O I：
10.1039/jm9920200709
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The crystal structures of two doped, oxide ion and protonic conducting perovskites, BaCe0.9M0.1O2.95 with M = Gd or Y, have been refined from room-temperature neutron powder diffraction data. Both compounds are orthorhombic, space group Pmcn, Z = 4, with lattice constants a = 8.7705(4) angstrom, b = 6.2233(3) angstrom, c = 6.2393(3) angstrom for BaCe0.9Y0.1O2.95 and a = 8.7728(16) angstrom, b = 6.2219(12) angstrom, c = 6.2443(14) angstrom for BaCe0.9Gd0.1O2.95. The lattice constants and fractional coordinates of both compounds are shifted only slightly from the undoped compound indicating the good lattice match of Y3+/Gd3+ for Ce4+ . For Y-doping, the extrinsic anion vacancy has been found to lie on only one of the two crystallographically distinct oxygen sites but the extreme absorption cross-section of Gd precluded refinement of the oxygen site occupancies in BaCe0.9Gd0.1O2.95.
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页码：709 / 712
页数：4
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