Synthesis, structure and ferroelectric property of a new niobate: Sr6CrNb9O30

被引：30

作者：

Liang, Fang ^{[1
]}

Hui, Zhang ^{[1
]}

Bolin, Wu ^{[1
]}

Runzhang, Yuan ^{[1
]}

机构：

[1] State Key Lab. A. T. M. S./P., Wuhan University of Technology, Wuhan 430070, China

来源：

Progress in Crystal Growth and Characterization of Materials | 2000年 / 40卷 / 01期

关键词：

Crystal growth - Crystal structure - Ferroelectricity - Permittivity - Phase transitions - Strontium compounds - Synthesis (chemical) - X ray crystallography;

D O I：

10.1016/S0960-8974(00)00037-1

中图分类号：

学科分类号：

摘要：

A new niobate Sr6CrNb9O30 was found in the ternary system SrO-Cr2O3-Nb2O5. The transparent crystal which has a green color and a need-like shape can be grown by the flux method. The crystal structure was determined by x-ray diffraction analysis and dielectric measurement, and it belongs to the orthorhombic tungsten bronze structure at room temperature with space group Cmm2, and unit cell parameters a = 1.7505(4) nm, b = 1.7510(1) nm, c = 7.768(4) nm, Z = 4. Dielectric constant measurement show that Sr6CrNb9O30 has two phase transitions, paraelectric to ferroelectric at 110 °C and ferroelectric to ferroelastic at 205 °C.

引用

页码：161 / 165