Effects of Heat Treatment on the Magnetic Phase Transition and Magnetocaloric Properties of Mn1+δAs1-xSbx

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  • Effects of Heat Treatment on the Magnetic Phase Transition and Magnetocaloric Properties of Mn<SUB>1+δ</SUB>As<SUB>1−<I>x</I></SUB>Sb<I><SUB>x</SUB></I>
  • Effects of Heat Treatment on the Magnetic Phase Transition and Magnetocaloric Properties of Mn1 デルタ As1 xSbx
  • Effects of Heat Treatment on the Magnetic Phase Transition and Magnetocaloric Properties of Mn<SUB>1+&delta;</SUB>As<SUB>1&minus;<I>x</I></SUB>Sb<I><SUB>x</SUB></I>

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We studied effects of heat treatment on the magnetic transition and the magnetocaloric effects (MCEs) of Mn1+δAs1−xSbx with x=0.1 and 0.25. It is found that sintering at an appropriate temperature gives a sharp magnetic transition and hence giant MCEs for Mn1+δAs1−xSbx. In the bulk samples slowly cooled from a liquid state, free Sb was precipitated, which gives rise to compositional deviation. Quenching from a liquid state suppresses the precipitation of Sb. Subsequent annealing is effective to improve homogeneity, as a result, the sample undergoes a sharp magnetic transition. The optimum conditions of heat treatments of the present system for a sharp magnetic transition are discussed.

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