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研究了具有菱方Th2Zn17型结构的Ce2Fe16Al化合物在居里温度TC附近的磁性和磁熵变.实验结果表明,在居里温度附近样品的磁特性符合二级相变规律,样品的居里温度为2758K.通过磁化强度与磁场和温度关系的测量,计算出临界指数β=044±001,γ=130±001,δ=383±001,临界指数β,γ,δ基本满足标度率方程γ=β(δ-1),但偏离三维Heisenberg模型的理论值.Ce2Fe16Al化合物的磁熵变在居里温度处达到峰值,2T外磁场下的最大磁熵变为195J/kg K.
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关键词:
- Ce2Fe16Al化合物 /
- 临界指数 /
- 磁熵变
The magnetic properties and magnetic entropy change near Curie temperature TC have been investigated for the Ce2Fe16Al compound with a rhombohedral Th2Zn17type structure. The magnetic behaviour is found to obey the secondorder phase transition laws near TC which is 2758K. The critical indices β=044±001, γ=130±001, δ=383±001 are obtained by calculating the field and temperaturedependences of magnetization. The critical indices satisfy the scaling law γ=β(δ-1), but these values deviate the threedimensional Heisenberg model. The maximum entropy change at TC under a field of 2T is 195J/kgK.-
Keywords:
- Ce2Fe16Al compound /
- critical indices /
- magnetic entropy change







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