Dielectric properties and structure of Bi4NbO8Cl and Bi4TaO8Cl

被引：61

作者：

Kusainova, AM

Stefanovich, SY

Dolgikh, VA

Mosunov, AV

Hervoches, CH

Lightfoot, P ^{[1
]}

机构：

[1] Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland

[2] Karpov Inst Phys Chem, Moscow 103064, Russia

[3] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2001年 / 11卷 / 04期

关键词：

D O I：

10.1039/b008492l

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The layered intergrowth phases Bi4MO8Cl (M = Nb, Ta), structurally related to the well-known Aurivillius phase ferroelectrics, have been studied using SHG and a.c. impedance techniques. Both undergo a polar to centrosymmetric phase ferroelectric-type transition (T-c = 765 and 640 K for M = Nb and Ta, respectively). The crystal structure of the low temperature phase of Bi4NbO8Cl has been re-analysed, and a tentative structure for Bi4TaO8Cl determined, from powder neutron diffraction data. The basic structural features are confirmed, but significant details differ from the previously reported X-ray structure of Bi4NbO8Cl.

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页码：1141 / 1145

页数：5

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