The effects of thermal treatment on the physical properties of Sr2FeMo1-xMxO6 perovskite with M = W, Ta and x ≤ 0.3

被引：27

作者：

Burzo, E. ^{[1
]}

Balasz, I. ^{[1
]}

Valeanu, M. ^{[2
]}

Pop, I. G. ^{[3
]}

机构：

[1] Univ Babes Bolyai, Fac Phys, Cluj Napoca 400084, Romania

[2] Natl Inst Mat Phys, Bucharest, Romania

[3] Emmanuel Univ, Oradea, Romania

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 01期

关键词：

Perovskite; Crystal structure; Magnetic moments; Magnetoresistivity; HIGHLY ORDERED SR2FEMOO6; MAGNETIC-PROPERTIES; MAGNETORESISTANCE; MOSSBAUER; DISORDER; OXIDES; FE; SB;

D O I：

10.1016/j.jallcom.2010.08.126

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 Sr2FeMo1-xMxO6 double perovskites with M = W and Ta and x <= 0.3, were obtained by sintering at 1300 degrees C. during 4 and 8 h, respectively. The perovskites crystallize in a tetragonal structure having 14/mmm space group. The grains are more homogeneous when sintering time is increased. The samples sintered longer time show higher values of saturation magnetizations, resistivities and magnetoresistivities than the samples sintered during 4 h. The intergrain tunnelling magnetoresistance as well as the intragrain contributions, respectively were analysed as function of temperature and external field. The changes in the physical properties, when the sintering time is increased, have been correlated with the number of antisite defects as well as the nature of grain boundaries. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：105 / 113

页数：9

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