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

Magnetic phase transition in La0.7Sr0.3MnO3/Ta2O5 ceramic composites
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La0.7Sr0.3MnO3/Ta2O5陶瓷复合材料的磁相变

DOI:
10.1016/j.ceramint.2011.10.014
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发表时间:
2012-04
影响因子:
5.2
通讯作者:
Zhao Y
Zhao Y
中科院分区:
材料科学1区
文献类型:
--
作者:
Yang XS;Yang LQ;Lv L;Cheng CH;Zhao Y

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研究了不同晶粒尺寸La0.7Sr0.3MnO3/ ta2o5复合材料的磁相变特性。在较低温度下烧结时间较短的100 ~ 200nm范围内的复合材料,其|dM/dT| -T曲线出现了双极大值,表明发生了两次顺磁-铁磁(PM-FM)转变。tc1和tc2的PM-FM转变温度分别是晶界和晶粒的贡献。tc1随ta2o5含量和烧结条件的变化而变化,而tc2基本保持不变。对于晶粒尺寸大于500nm的复合材料,经长时间高温烧结,观察到单磁相变行为。
Magnetic phase transition characteristic in La0.7Sr0.3MnO3/Ta2O5composites with different grain size was investigated in this work. There were double maxima in |dM/dT|–T curves for the composites with grain size in the range of 100–200nm sintered at relative low temperature for short time, which indicated that two paramagnetic–ferromagnetic (PM–FM) transitions happened. The PM–FM transition temperatures of Tc1and Tc2were the contribution of grain boundary and grain, respectively. Tc1varied with Ta2O5content and sintering condition, whereas Tc2remained almost the same value. For the composites with grain size larger than 500nm sintered at high temperature for long time, single magnetic phase transition behavior was observed.
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