Theoretical work on magnetocaloric effect in La0.75Ca0.25MnO3

Abstract

In this work, a phenomenological model is applied to describe the magnetocaloric effect for the La0.75Ca0.25MnO3 system near a second-order phase transition from a ferromagnetic to a paramagnetic state. Based on this model, it can predict the values of the magnetocaloric properties from calculation of magnetization as a function of temperature under different external magnetic fields. The magnetic entropy change reaches a peak of about 5.39 J/(kg·K) at 257 K upon 4 T applied field variation. The ΔSM distribution is much more uniform than that of gadolinium, which is desirable for an Ericson-cycle magnetic refrigerator.

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Correspondence to Mahmoud Aly Hamad.

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Hamad, M.A. Theoretical work on magnetocaloric effect in La0.75Ca0.25MnO3. J Adv Ceram 1, 290–295 (2012). https://doi.org/10.1007/s40145-012-0027-8

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Key words

  • magnetocaloric effect
  • model
  • magnetic entropy change
  • heat capacity change
  • relative cooling power