Abstract
The equiatomic intermetallic alloy MnZnSb with a tetragonal Cu2Sb-type crystal structure (space group P4/nmm) was melted in the resistance furnace in the evacuated quartz ampoule. The adiabatic temperature change (ΔTad) and the isothermal variation of the magnetic entropy (ΔSM) of the MnZnSb compound near to the magnetic phase transition were studied. The ΔTad in a magnetic field up to 1.25 T was studied by the direct method. It was found that temperature dependencies of both ΔTad and ΔSM show a sharp peak near room temperature with a maximum at Curie temperature TC = 317 K. It was shown that there is no temperature hysteresis of the ΔTad in MnZnSb, and the maximum of ΔTad when the compound is heated or cooled is detected at the same temperature. The estimated value of ΔTad in a field of 14 T is 4.5 K. It was shown that near the Curie temperature, the field dependence of the maximum of magnetic entropy change is adequately described by the thermodynamic Landau theory for magnetic second-order phase transitions.
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