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

作者：Yang X S; Yang L Q; Lv L; Cheng C H; Zhao Y^*

来源：Ceramics International, 2012, 38(3): 2575-2578.

DOI：10.1016/j.ceramint.2011.10.014

• Magnetic properties
• Perovskites
• Composites

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.

• 出版日期2012-4
• 单位西南交通大学