Bi2La4O9: A monoclinic phase in the system Bi2O3-La2O3

被引：17
|
作者：
Chen, XL
Eysel, W
Li, JQ
机构：
[1] UNIV HEIDELBERG,INST MINERAL,D-69120 HEIDELBERG,GERMANY
[2] MAX PLANCK INST FESTKORPERFORSCH,D-70569 STUTTGART,GERMANY
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 1996年 / 124卷 / 02期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1006/jssc.1996.0240
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The binary system Bi2O3-La2O3 with La2O3 greater than or equal to 50 mole% has been investigated at 950-1000 degrees C, The results revealed three compounds: Bi8La10O27, Bi2.4La3.6O9, and Bi2La4O9. Bi2.4La3.6O9 has a rhombohedral subcell with hexagonal lattice parameters a = 3.96017(5) Angstrom, c = 9.9691(2) Angstrom, and space group R3m. It is probably the same phase which was reported previously as Bi2La4O9 (Refs. 5 and 6). Bi2La4O9 has a monoclinic structure with the subcell lattice parameters a = 6.8290(3) Angstrom, b = 3.9887(1) Angstrom, c = 4.0524(1) Angstrom and beta = 125.094(3)degrees and subcell space group C2/m. Its average structure has been determined by X-ray powder diffraction and refined by the Rietveld method. The average structure can be described as an oxygen deficient fluorite structure of the delta-Bi2O3 type with La and Bi randomly distributed on the cation site. In addition, a superstructure has been observed by TEM. (C) 1996 Academic Press, Inc.
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收藏
页码：300 / 304
页数：5
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