期刊
SOLID STATE IONICS
卷 174, 期 1-4, 页码 15-18出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2004.04.039
关键词
oxide-ion conductor; Bi7WO13.5; solid solubility extension; sluggish decomposition; Bi14WO24
In the system Bi2O3-WO3, a phase Bi7WO13.5 (22.22 mol% WO3) with high oxide-ion conduction exists stably above 670 degreesC, although this phase was thought to be the central composition of a solid solution and stable even in room temperature. Below 670 degreesC, Bi7WO13.5 decomposes sluggishly to yield a mixture of a bismuth-rich limit of the solid solution and a small quantity of Bi14WO24 with far lower electrical conduction. The stable solid solubility region expands from 20 to 27 mol% WO3 at 850 degreesC and from 23 to 25.5 mol% WO3 below 500 degreesC. (C) 2004 Elsevier B.V. All rights reserved.
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