Synthesis and characterization of the Aurivillius phases Bi2-xPb(x)Sr(1-x)Nd(x)Nb(2)O(9)

被引：15

作者：

Rentschler, T

Karus, M

Wellm, A

Reller, A

机构：

[1] Univ of Hamburg, Hamburg, Germany

来源：

SOLID STATE IONICS | 1996年 / 90卷 / 1-4期

关键词：

Aurivillius phase; perovskite; lead substitution; EXAFS; ferroelectricity;

D O I：

10.1016/S0167-2738(96)00388-8

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 n=2 Aurivillius phase Bi2-xPbxSr1-xNd2O9 was successfully synthesized as a ceramic material over the whole range of simultaneous, charge compensated substitution x = 0-1.0. Structural investigations were performed by Rietveld refinement applying different space groups Fmmm and A2(1)am, and additionally by X-ray absorption spectroscopy (EXAFS) on the Nd L(III)-edge, confirming the accommodation of Nd on the atomic sites of Sr, which implies the substitution of Bi3+ by the isoelectronic Pb2+. The ferroelectric transition temperature T-c= 270 degrees C of the substituted powders with x = 0.4 and 1.0 is distinctly reduced compared to the unsubstituted sample with T-c= 450 degrees C. In temperature resolved powder X-ray diffraction patterns no structural phase transition could be detected.

引用

页码：49 / 55

页数：7

共 20 条

[1] ATOMIC DISPLACEMENT RELATIONSHIP TO CURIE TEMPERATURE AND SPONTANEOUS POLARIZATION IN DISPLACIVE FERROELECTRICS [J].