Crystal structure and ferroelectric properties of mixed bismuth layer-structured Bi7Ti4+x/2Nb1-xWx/2O21 ceramics

被引：16

作者：

Yokoi, A ^{[1
]}

Ogawa, H ^{[1
]}

机构：

[1] Meijo Univ, Fac Sci & Technol, Tempaku Ku, Nagoya, Aichi 4688502, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2006年 / 129卷 / 1-3期

关键词：

layer structures; titanium oxide; tungsten oxide; electron microscopy;

D O I：

10.1016/j.mseb.2005.12.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of Ti and W substitutions for Nb on the ferroelectric properties and the crystal structure of Bi7Ti4+x/2Nb1-xWx/2O21 ceramics were investigated in this study. From the XRPD patterns, no impurity phase was observed in the composition range from 0 to 1. The solid solutions have orthorhombic symmetry, with 12cm space group. The curve representing the relationship between composition x and remanent polarization (P,) passes through a maximum at approximately x = 0.75; therefore, the maximum P-r value of 12.4 mu C/cm(2) was obtained for this composition. The variation in the structural distortion of oxygen octahedra in the pseudo-perovskite block showed the same tendency as that of the P-r values. On the other hand, the coercive field (E-c) of the samples at the composition range from 0 to 1 remained the approximately constant value of 90 kV/cm. Moreover, the Curie temperature (T,) of the samples was decreased from 840 to 715 degrees C by the increase of the structural distortion of the pseudo-perovskite block, which was caused by the Ti and W substitutions for Nb. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：80 / 85

页数：6

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