Investigations of the "tungsten-bronze"-type (Ba1-αSrα)6-xLa8+2x/3Ti18O54 (0≤ x ≤3) solid solutions

被引:5
|
作者
Mercurio, D [1 ]
Abou-Salama, M [1 ]
Mercurio, JP [1 ]
机构
[1] Univ Limoges, Fac Sci, UMR 6638, F-87060 Limoges, France
关键词
dielectric properties; titanates; X-ray methods;
D O I
10.1016/S0955-2219(01)00350-8
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A study of the Ba/La/Sr ordering in the (Ba1-alphaSralpha)(6-x)La8+2x,3Ti18O54 (0 less than or equal tox less than or equal to3) solid solutions was carried out by X-ray diffractometry and dielectric measurements. The maximum of substitution is obtained for x=0 and alpha =0.33, i.e. for Ba4Sr2La8Ti18O54 composition. The crystal structure is closely related to the tungsten-bronze-type structure with 3 x 3 octahedral units of perovskite columns (orthorhombic symmetry, s.g. Pnma, a approximate to 22.4 Angstrom, b approximate to7.7 Angstrom, c approximate to 12.2 Angstrom). The A2 sites (pentagonal channels) and the Al sites (rhombic channels within the perovskite-like columns) are occupied by Ba and La respectively. Sr always occupies the particular rhombic Al' sites located at the junction of two perovskite-like columns which can also accept excess Ba and La. The A2 and Al' sites may be cation deficient. The structure of Ba-4(Sr2La6)Ti18O54 with structural composition A2(4)(Al'Al-2(8))Ti18O54, is fully ordered. The thermal behaviour of the permittivity and, for some compositions, the occurrence of a strong dispersion in a wide temperature range, would likely be connected both to a cationic disorder (Sr, Ba and/or La) and vacancies in the rhombic Al' sites. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2713 / 2716
页数:4
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