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Structural and Magnetic Phase Transitions of Shape-Memory Ni50Mn25+xGa25-x Alloys with Excess Mn
Nguyen Phu Thuy,Ngo Van Nong,Yeong Der Yao 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The Mn-excess Ni50Mn25+xGa25-x alloys with 1 < x < 7 were developed to investigate struc- tural transitions and magnetic properties. The martensitic transformation temperature (TM) for the structural transformation from tetragonal to cubic was clearly observed from magnetization, electrical resistivity and X-ray diraction studies as a function of temperature for temperatures be- low 400 K. The TM value increased roughly from 260 K to 355 K with increasing Mn concentration and TM showed an abrupt change at the composition x = 5. For the structural transition, the Curie temperature (TC) decreased slightly from 380 K and was insensitive to variations on the Mn/Ga ratio. During the heating and the cooling processes, the samples showed a temperature hysteresis at and below TM. A magnetic-eld-induced strain (MFIS) of about 0.2 % at an applied magnetic ld of 4.2 kOe was derived by using the martensitic transition temperature for polycrystalline samples. The Mn-excess Ni50Mn25+xGa25-x alloys with 1 < x < 7 were developed to investigate struc- tural transitions and magnetic properties. The martensitic transformation temperature (TM) for the structural transformation from tetragonal to cubic was clearly observed from magnetization, electrical resistivity and X-ray diraction studies as a function of temperature for temperatures be- low 400 K. The TM value increased roughly from 260 K to 355 K with increasing Mn concentration and TM showed an abrupt change at the composition x = 5. For the structural transition, the Curie temperature (TC) decreased slightly from 380 K and was insensitive to variations on the Mn/Ga ratio. During the heating and the cooling processes, the samples showed a temperature hysteresis at and below TM. A magnetic-eld-induced strain (MFIS) of about 0.2 % at an applied magnetic ld of 4.2 kOe was derived by using the martensitic transition temperature for polycrystalline samples.
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