Abstract
The Mn1−x 57Fe x As (x = 0.001, 0.003, 0.005) compounds for magnetic refrigeration application were synthesized by using a solid-vapor reaction method. We have investigated the crystallographic and magnetic properties of Mn1−x 57Fe x As (x = 0.001, 0.003, 0.005) samples by using x-ray diffractometer (XRD), vibrating sample magnetometer (VSM), superconducting quantum interference device (SQUID), and Mossbauer spectrometer. The XRD patterns, revealed that all samples exhibited hexagonal space group P63/mmc below Curie temperature (T C ), while above T C they belong to the orthorhombic space group Pnma. The temperature-dependent magnetization curves under 200 Oe between 4.2 and 320 K showed a large hysteresis in the magnetization as a function of the temperature. To analyze the meagnetocaloric effect, the value of magnetic entropy (−ΔS M ) was calculated from the isothermal initial curves up to 5 T at various temperatures. Mossbauer spectra of Mn0.997 57Fe0.003As sample were taken at various temperatures ranging from 4.2 to 315 K.
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