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1 2003

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Large magnetocaloric effect in perovskite manganites: magnetic entropy changes above 300 K

Phan M. H., Yu S. C., Ulyanov A. N., Lachowicz H. K.

Materials Science

2003

Vol. 21, No. 1

133-139

We present here, the results of an investigation of the large magnetic entropy change, M S D , above 300 K in a series of La0.65Sr0.35MnO3, La0.6Sr0.2Ca0.2MnO3, La0.6Sr0.2Ba0.2MnO3, La0.7Ba0.3MnO3 and La0.7Ba0.24Ca0.06MnO3 perovskite manganites. Among the studied compositions, La0.6Sr0.2Ba0.2MnO3 exhibits a highest value of 2.26 J/kg/K for |ASMmax| at the Curie temperature, TC = 354 K, when the field is changed from 0 to 10 kOe. The adiabatic temperature change, ATad, of this sample is ~ 1.1 K and ~ 4.95 K in the fields of 10 kOe and 50 kOe, respectively. Since the large magnetocaloric effect was found in the present materials with above 300 K Curie temperature, these materials seem to be attractive for above room temperature magnetic refrigeration applications.