Magnetism and Mechanical Properties of Mn_1.28Fe_0.67P_0.48Si_0.52 / Cu Composites

Abstract:

This paper reports the effect of Cu doping in first order phase transition material Mn_1.28Fe_0.67P_0.48Si_0.52 on its phase structure, magnetocaloric effect and mechanical properties. The results of XRD, SEM and EDS analysis show that the Mn_1.28Fe_0.67P_0.48Si_0.52 in this composite forms Fe₂P hexagonal structure and the space group is P-62m;Most of Cu exists as a simple substance, and a small amount of Cu and Mn form a solid solution. When the mass ratio of Cu reaches 10:4, the (Mn,Fe)₃Si phase appears in Mn_1.28Fe_0.67P_0.48Si_0.52. The magnetic measurement results show that the saturation magnetization of Mn_1.28Fe_0.67P_0.48Si_0.52 after Cu doping has no obvious change, the Curie temperature decreases, and the thermal hysteresis increases. The maximum magnetic entropy change becomes smaller as the Cu content increases. Under a 1.5 T external magnetic field, the maximum magnetic entropy ΔS_m of the composite decreases rapidly from 11 J/kg·K at x = 0 to 4 J/kg·K at x = 5,the half width of the magnetic entropy change gradually increases. The Vickers hardness of the composite is reduced, the compressive strength has been greatly improved, and the mechanical properties have been significantly enhanced after Cu doping.

• Periodical: Solid State Phenomena (Volume 288)
• Pages: 104-112
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.288.104
• Online since: March 2019
• Authors: Ojiyed Hamt, Hascholu Oimod, Ojiyed Tegus*
• Keywords: Curie Temperature, Magnetic Refrigeration, Magnetocaloric Effect, Mechanical Stability

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