ALaMnBO6 (A = Ca, Sr, Ba; B = Fe, Ru) double perovskites

被引：60

作者：

Ramesha, K

Thangadurai, V

Sutar, D

Subramanyam, SV

Subbanna, GN

Gopalakrishnan, J ^{[1
]}

机构：

[1] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

[3] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India

来源：

MATERIALS RESEARCH BULLETIN | 2000年 / 35卷 / 04期

关键词：

oxides; chemical synthesis; X-ray diffraction; electrical properties; magnetic properties;

D O I：

10.1016/S0025-5408(00)00248-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the synthesis and investigation of electrical and magnetic properties of double perovskites of the formula ALaMnBO(6) for A = Ca, Sr, Ba and B = Fe, Ru. Powder X-ray diffraction (XRD) shows formation of cubic/pseudocubic perovskite structure for all the phases, with no obvious long-range ordering of B-site cations. Electron diffraction, however, reveals an ordering of Mn and Ru in ALaMnRuO(6), showing a doubling of the primitive cubic perovskite cell. While the B = Fe phases are paramagnetic insulators, the B = Ru phases are ferrimagnetic semiconductors. It is likely that in the B = Ru phases, a valence equilibrium exists between Mn-III/Ru-IV and Mn-II/Ru-V states that is biased toward the latter. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：559 / 565

页数：7

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