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Magnetic entropy change in La(Fe 0.98 Co 0.02 ) 11.7 Al 1.3

2000; IOP Publishing; Volume: 12; Issue: 46 Linguagem: Inglês

10.1088/0953-8984/12/46/101

1361-648X

Fengxia Hu, Baogen Shen, Jirong Sun, Zhao‐Hua Cheng, Xixiang Zhang,

Magnetic Properties of Alloys

Magnetization of compound La(Fe0.98Co0.02)11.7Al1.3 was measured carefully as functions of temperature and applied field around its Curie temperature of ~198 K. Magnetic entropy change |ΔS|, allowing estimation of the magnetocaloric effect (MCE), was determined based on thermodynamic Maxwell's relation. The achieved magnitude of |ΔS| reaches 10.6 J kg-1 K-1 under a field of 5 T. The considerable entropy change is believed to be due to the high magnetization and the sharp change in magnetization at TC. It is found that the magnetic phase transition is completely reversible in temperature, indicating a nature of second-order phase transition.