Raman scattering study and electrical properties characterization of elpasolite perovskites Ln2(BB′)O6 (Ln = La, Sm... Gd and B,B′= Ni, Co, Mn)

被引：120

作者：

Bull, CL

McMillan, PF

机构：

[1] UCL Royal Inst Great Britain, Davy Faraday Res Labs, London W1S 4BS, England

[2] UCL, Christopher Ingold Labs, Dept Chem, London WC1H 0AJ, England

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 07期

关键词：

Raman spectroscopy; perovskites; octahedral tilts; electrical properties; magnetism;

D O I：

10.1016/j.jssc.2004.02.022

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Two series of elpasolite perovskites Ln(2)CoMnO(6) and Ln(2)NiMnO(6) (Ln = La, Pr, Nd, Sm, Gd) have been prepared. The electronic band gap and magnetic Curie temperature vary systematically as a function of the rare earth cation size within both series. Here we used Raman scattering spectroscopy along with the results of previous structural studies to show that there is little change in octahedral distortion but significant changes in the octahedral tilting angle upon decreasing lanthanide ionic radius. The data indicate differences in the orbital overlap and bond strengths between the two series of materials that allow us to understand variations in the magnetic and electrical properties within and between the two perovskite series. (C) 2004 Elsevier Inc. All rights reserved.

引用

页码：2323 / 2328

页数：6

共 20 条

[1] Structural and chemical analysis of colossal magnetoresistance manganites by Raman spectrometry -: art. no. 104430 [J].