Cation distribution in the Bi4-xRExTi3O12 (RE=La, Nd) solid solution and Curie temperature dependence

被引：14

作者：

Arreuin-Zavala, J. ^{[1
]}

Villafuerte-Castrejon, M. E. ^{[1
]}

Gonzaleza, F. ^{[1
]}

Bucio, L. ^{[2
]}

Novelo-Peralta, O. ^{[1
]}

Sato-Berru, R. Y. ^{[3
]}

Ocotlan-Flores, J. ^{[3
]}

机构：

[1] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico

[2] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico

[3] Univ Nacl Autonoma Mexico, Ctr Ciencias Aplicadas & Desarrollo Tecnol, Mexico City 04510, DF, Mexico

来源：

MATERIALS CHARACTERIZATION | 2009年 / 60卷 / 03期

关键词：

Co-precipitation method; Doping effect; Curie temperature; Raman spectroscopy; Aurivillius phase; BISMUTH TITANATE; DISORDER; CRYSTAL;

D O I：

10.1016/j.matchar.2008.09.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bi4-xRExTi3O12 (RE=La, Nd) ferroelectric powders were prepared by a co-precipitation route. Raman spectroscopy and X-ray diffraction were employed to determine the crystal site of La3+ and Nd3+ as well as the effect of their addition on the crystal structure. It was found that La atoms were not only placed preferentially in pseudo-perovskite A sites for concentrations x <= 1.2 but also substituted for Bi3+ in (Bi2O2)(2+) layers for greater concentrations. A similar behavior was observed with the limit value x=0.8 in case of Nd3+. In solid solution La or Nd3+ ions diminish the distortions in the octahedron formed by oxygen atoms, so there is a tendency to undergo a transition in crystal symmetry from orthorhombic to tetragonal. Finally differential scanning calorimetry (DSC) shows a linear dependence of the Curie temperature (T-c) when the amount of La3+ or Nd3+ was increased. (C) 2008 Published by Elsevier Inc.

引用

页码：219 / 224

页数：6

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