LaMn2Ge2室温附近的磁相变与磁热性能

稀有金属材料与工程, 2006, 35(11): 1803-1805.

LaMn2Ge2室温附近的磁相变与磁热性能

张铁邦 ^1, , 陈云贵 ^2, , 唐永柏 ^3, , 涂铭旌 ^4,

1.四川大学,四川,成都,610065

2.四川大学,四川,成都,610065

3.四川大学,四川,成都,610065

4.四川大学,四川,成都,610065

基金项目: 国家高技术研究发展计划(863计划)(2002AA324010)

关键词： LaMn2Ge2 , 磁相变 , 磁熵变 , 居里温度

Magnetic Phase Transition and Magneticocaloric Effect of LaMn2Ge2 at Near Room Temperature

用非自耗真空电弧炉制备LaMn2Ge2合金,采用X射线衍射研究了合金的结构,LaMn2Ge2在常温下具有ThCr2Si2-型晶体结构,空间群为I4/mmm.利用振动样品磁强计测量合金的磁性能,根据升降温的磁化曲线所确定的合金发生反铁磁-铁磁相变温度有4.3 K的滞后,居里温度约320 K,具有一级相变的典型特征.通过不同温度的磁化曲线结果,计算得LaMn2Ge2在1.43×106A/m外场变化下居里温度附近的最大磁熵变为1.42 J/kg·K.

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材料期刊网

LaMn2Ge2室温附近的磁相变与磁热性能

Magnetic Phase Transition and Magneticocaloric Effect of LaMn2Ge2 at Near Room Temperature

参考文献