Influence of Annealing Conditions on Structure and Critical Parameters of Ni50Mn37Sn13 Magnetocaloric Material

Authors

  • Nguyen Huy Dan
  • Nguyen Manh An Hong Duc University, 565 Quang Trung, Dong Ve, Thanh Hoa.

DOI:

https://doi.org/10.15625/0868-3166/24/1/2862

Keywords:

Giant magnetocaloric effect, Heusler alloys, Arrott-Noaks Plot, Magnetic transition

Abstract

In this paper, we present the influence of annealing conditions on structure and magnetic behavior of Ni\(_{50}\)Mn\(_{37}\)Sn\(_{13}\) magnetocaloric alloy prepared by arc-melting technique. The results show that the almost single phase of the full Heusler structure of Ni\(_{2}\)MnSn could be achieved by appropriate annealing. The transformation between martensite and austenite phases, and multi-magnetic phase behavior are observed more clearly with higher fraction of Ni\(_{2}\)MnSn phase. By using Arrott-Noaks method, critical parameters were determined to be \(\beta   0.464 \pm  0.021\), \(\gamma  = 1.117 \pm  0.073\) and \(\delta  = 3.41\), which lay between mean-field model (\(\beta  = 0.5\) and \(\gamma = 1\), \(\delta  = 3\)) with long-range ferromagnetic orders and 3D Heisenberg model (\(\beta  = 0.365\), \(\gamma = 1.336\), \(\delta {\rm g}= 4.66\)) with short-range ferromagnetic orders. The calculated results are in good accordance with the experimentally observed coexistence of weak-ferromagnetic martensite and strong-ferromagnetic austenite phases.

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Author Biography

Nguyen Huy Dan

Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi.

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Published

23-03-2014

How to Cite

Dan, N. H., & An, N. M. (2014). Influence of Annealing Conditions on Structure and Critical Parameters of Ni50Mn37Sn13 Magnetocaloric Material. Communications in Physics, 24(1), 79. https://doi.org/10.15625/0868-3166/24/1/2862

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Papers