Structure and Inverse Magnetocaloric Effect of Mn_1.2Co_0.8Si_0.2P_0.8 Compound Prepared by SPS

Abstract:

The single-phase Mn_1.2Co_0.8Si_0.2P_0.8 compound was fabricated by the spark plasma sintering (SPS) technology followed by vacuum annealing. The microstructure, Néel temperature (T_N) and “inverse” magnetocaloric effect of this compound were investigated. The results show that the structure of Mn_1.2Co_0.8Si_0.2P_0.8 compound prepared by SPS is a single phase with precise stoichiometric proportion. Increasing the magnetic field from 0.05 T to 1 T, the T_N of the material reduces gradually from 110 k to 45 k, and a splitting of T_N appears. The splitting of the antiferro-to-ferromagnetic transition is an intrinsic feature rather than the secondary phase. Though the maxima entropy changes is about 0.6 Jkg^-1K^-1 at B=5T, the Mn_1.2Co_0.8Si_0.2P_0.8 phase synthesized by SPS is more favorable, more overall magnetic moment. In addition to the magnetic refrigeration applications, this compound may be used in thermomagnetic generators.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 860-864
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.860
• Online since: March 2016
• Authors: Lei Ma*, Liang Zhou, Lin Li, Zheng Fei Gu, Gang Cheng
• Keywords: Magnetic Refrigeration, Magnetocaloric Effect, Spark Plasma Sintering

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