Crystal structure of the ferroelectric mixed Aurivillius phase Bi7Ti4NbO21

被引：40

作者：

Mercurio, D

Trolliard, G

Hansen, T

Mercurio, JP

机构：

[1] Univ Limoges, UMR 6638, Fac Sci, F-87060 Limoges, France

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

INTERNATIONAL JOURNAL OF INORGANIC MATERIALS | 2000年 / 2卷 / 05期

关键词：

crystal structure; Aurivillius phases; intergrowths;

D O I：

10.1016/S1466-6049(00)00090-8

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The crystal structure of Bi7Ti4NbO21 has been solved by X-ray and neutron diffraction data analysis on single crystals. Bi7Ti4NbO21 crystallizes with orthorhombic symmetry, I2cm space group with a = 5.4420(10) Angstrom, b = 5.4040(10) Angstrom, c = 57.990(12) Angstrom and Z=2. The structure can be regarded as a mixed Aurivillius phase resulting of a regular intergrowth along the c-axis of one half the unit cell of Bi4Ti3O12 and one half the unit cell of Bi3TiNbO9 parent Aurivillius phases by sharing (Bi2O2)-Bi-*' common sheets. Perovskite-like slabs with BiTiNbO7 and Bi2Ti3O10 compositions are distorted in a way close to that observed in Bi3TiNbO9 and Bi4Ti3O12 ones respectively. (C) 1000 Elsevier Science Ltd. All rights reserved.

引用

页码：397 / 406

页数：10

共 19 条

[1]

AURIVILLIUS B, 1951, ARK KEMI, V2, P519

[2]

AURIVILLIUS B, 1949, ARK KEMI, V0001

[3] BOND-VALENCE PARAMETERS OBTAINED FROM A SYSTEMATIC ANALYSIS OF THE INORGANIC CRYSTAL-STRUCTURE DATABASE [J].