TAILIEUCHUNG - Influence of annealing conditions on structure and critical parameters of Ni50Mn37Sn13 magnetocaloric material

In this paper, we present the influence of annealing conditions on structure and magnetic behavior of Ni50Mn37Sn13 magnetocaloric alloy prepared by arc-melting technique. The results show that the almost single phase of the full Heusler structure of Ni2MnSn 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 Ni2MnSn phase. | Communications in Physics, Vol. 24, No. 1 (2014), pp. 79-84 INFLUENCE OF ANNEALING CONDITIONS ON STRUCTURE AND CRITICAL PARAMETERS OF Ni50 Mn37 Sn13 MAGNETOCALORIC MATERIAL NGUYEN HUY DAN Institute of Materials Science, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam. NGUYEN MANH AN Hong Duc University, 565 Quang Trung St., Thanh Hoa City, Vietnam E-mail: dannh@ Received 17 December 2013 Accepted for publication 22 April 2014 Abstract. In this paper, we present the influence of annealing conditions on structure and magnetic behavior of Ni50 Mn37 Sn13 magnetocaloric alloy prepared by arc-melting technique. The results show that the almost single phase of the full Heusler structure of Ni2 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 Ni2 MnSn phase. By using Arrott-Noaks method, critical parameters were determined to be β = ± , γ = ± and δ = , which lay between mean-field model (β = and γ = 1, δ = 3) with long-range ferromagnetic orders and 3D Heisenberg model (β = , γ = , δ = ) 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. Keywords: Giant magnetocaloric effect, Heusler alloys, Arrott-Noaks Plot, Magnetic transition. I. INTRODUCTION Ni-Mn-Sn Heusler alloys have been attracting a lot of scientists by virtue of their giant magnetocaloric effect (GMCE) and application potential for magnetic refrigeration at room temperature [1-9]. Both the positive (inverse) and negative (normal) GMCEs could be observed in these alloys by changing composition and fabrication conditions. The positive GMCE is believed to relate to a transformation between martensite and austenite phases.

• Vật lý
• Communications in Physics
• Annealing conditions on structure
• Critical parameters of Ni50Mn37Sn13 magnetocaloric material
• Ni50Mn37Sn13 magnetocaloric material
• Multi magnetic phase behavior
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