Magnetic properties and magnetic entropy change of Ce2Fe16Al near Curie temperature

Abstract

The magnetic properties and magnetic entropy change near Curie temperature TC have been investigated for the Ce2Fe16Al compound with a rhombohedral Th2Zn17type structure. The magnetic behaviour is found to obey the secondorder phase transition laws near TC which is 2758K. The critical indices β＝044±001， γ＝130±001， δ＝383±001 are obtained by calculating the field and temperaturedependences of magnetization. The critical indices satisfy the scaling law γ=β(δ-1), but these values deviate the threedimensional Heisenberg model. The maximum entropy change at TC under a field of 2T is 195J/kgK.