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

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 Field Value Title Influence of Annealing Conditions on Structure and Critical Parameters of Ni50Mn37Sn13 Magnetocaloric Material Creator Dan, Nguyen Huy An, Nguyen Manh Subject Giant magnetocaloric effect, Heusler alloys, Arrott-Noaks Plot, Magnetic transition — Description 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. Publisher Publishing House for Science and Technology, Vietnam Academy of Science and Technology Contributor — Date 2014-03-23 Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — — Format application/pdf Identifier http://vjs.ac.vn/index.php/cip/article/view/2862 10.15625/0868-3166/24/1/2862 Source Communications in Physics; Vol 24, No 1 (2014); 79 Communications in Physics; Vol 24, No 1 (2014); 79 0868-3166 0868-3166 Language eng Relation http://vjs.ac.vn/index.php/cip/article/view/2862/3896 http://vjs.ac.vn/index.php/cip/article/downloadSuppFile/2862/631