Crystal and electronic structures of Bi4(Ti,Si) 3O12 ferroelectrics

被引：0

作者：

Idemoto Y. ^{[1
]}

Kotani H. ^{[1
]}

Kitamura N. ^{[1
]}

机构：

[1] Faculty of Science and Technology, Tokyo University of Science, Noda 278-8510

来源：

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy | 2010年 / 57卷 / 04期

关键词：

Bi[!sub]4[!/sub]Ti[!sub]3[!/sub]O[!sub]12[!/sub; Maximum entropy method; Neutron diffraction; Rietveld analysis; Synchrotron X-ray diffraction;

D O I：

10.2497/jjspm.57.191

中图分类号：

学科分类号：

摘要：

In this work, we synthesized Bi4Ti3O12 and Bi4Ti2.85Si0.15O12by means of a conventional solid-state reaction, and investigated their ferroelectric properties. From P-E hysteresis measurement, it was demonstrated that the Bi4Ti3O12 began to show higher remanent polarization and lower coercive field by partially substituting Si for Ti. In order to clarify how the substitution affected the crystal and electronic structures and thus ferroelectric properties, we performed X-ray absorption fine structure spectroscopy, synchrotron X-ray diffraction and neutron diffraction measurements. As a result, it was found by Rietveld analysis using neutron diffractions that local distortions of TiO6 octahedra increased by the partial substitution of Si for Ti. Taking it into account that such a distortion induces a polarization in a crystal, this may be one of the reasons why the substitution improved ferroelectric properties of Bi4Ti 3O12. From electronic density distributions estimated by maximum entropy method, it was also suggested that Ti-O bond became stronger by the substitution.

引用

页码：191 / 197

页数：6

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