Magnetic phase transition in La0.7Sr0.3MnO3/Ta2O5 ceramic composites

被引：9
作者：
Yang, X. S. [1 ]
Yang, L. Q. [1 ]
Lv, L. [1 ]
Cheng, C. H. [2 ]
Zhao, Y. [1 ,2 ]
机构：
[1] SW Jiaotong Univ, Superconductor & New Energy R&D Ctr, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Peoples R China
[2] Univ New S Wale, Sch Mat Sci & Engn, Superconduct Res Grp, Sydney, NSW 2052, Australia
来源：
CERAMICS INTERNATIONAL | 2012年 / 38卷 / 03期
基金：
美国国家科学基金会;
关键词：
Magnetic properties; Perovskites; Composites; ROOM-TEMPERATURE; MAGNETORESISTANCE;
D O I：
10.1016/j.ceramint.2011.10.014
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Magnetic phase transition characteristic in La0.7Sr0.3MnO3/Ta2O5 composites with different grain size was investigated in this work. There were double maxima in vertical bar dM/dT vertical bar-T curves for the composites with grain size in the range of 100-200 nm sintered at relative low temperature for short time, which indicated that two paramagnetic-ferromagnetic (PM FM) transitions happened. The PM FM transition temperatures of T-c1 and T-c2 were the contribution of grain boundary and grain, respectively. T-c1, varied with Ta2O5 content and sintering condition, whereas T-c2 remained almost the same value. For the composites with grain size larger than 500 nm sintered at high temperature for long time, single magnetic phase transition behavior was observed. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：2575 / 2578
页数：4
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