TY - JOUR
T1 - Magnetic and martensitic transformation properties under ambient and hydrostatic pressures of Ni50Mn25.2Fe2.8Ga22 ferromagnetic shape memory alloy
AU - Xu, Xiao
AU - Kanomata, Takeshi
AU - Yamazaki, Naoya
AU - Nishihara, Hironori
AU - Nagasako, Makoto
AU - Adachi, Yoshiya
AU - Sakon, Takuo
AU - Kainuma, Ryosuke
N1 - Funding Information:
The authors would like to express our sincere thanks to Professor T. Shishido and Mr. K. Obara from Institute for Materials Research, Tohoku University for sample preparation, as well as Professor K.R.A. Ziebeck from Department of Physics, Cavendish Laboratory, University of Cambridge, for reading the manuscript. A part of the experiments was performed at the Center for Low Temperature Science, Institute for Materials Research, Tohoku University. A part of this study was supported by a Grant-in-Aid for Scientific Research, provided by the Japan Society for the Promotion of Science .
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/5/15
Y1 - 2019/5/15
N2 - The magnetic and martensitic transformation properties of Ni50Mn25.2Fe2.8Ga22 ferromagnetic shape memory alloy were systematically investigated. The Curie temperature TC and the martensitic transformation temperature TM were determined. The temperature variations of the lattice parameters were measured by using an in situ X-ray powder diffractometer. This alloy crystallizes in cubic L21-type structure for the parent phase and the martensitic transformation was observed to start at 294 K with a small volume change ΔV. The effect of hydrostatic pressure on TC and TM was investigated by measuring the temperature dependence of the initial permeability at various pressures up to 9.4 kbar. It was found that TM increases with increasing pressure. By use of the Clausius-Clapeyron equation, the values of dTM/dp and ΔV determined in this study were found to be consistent with the result of the entropy change ΔS, which was estimated by thermoanalysis. On the other hand, TC was found to slightly decrease with increasing pressure, which is a unique behavior compared to other Ni2MnZ (Z = Ga, In, Sn, Sb) alloys. On the basis of the experimental results, the exchange mechanism of the Ni50Mn25.2Fe2.8Ga22 alloy is discussed.
AB - The magnetic and martensitic transformation properties of Ni50Mn25.2Fe2.8Ga22 ferromagnetic shape memory alloy were systematically investigated. The Curie temperature TC and the martensitic transformation temperature TM were determined. The temperature variations of the lattice parameters were measured by using an in situ X-ray powder diffractometer. This alloy crystallizes in cubic L21-type structure for the parent phase and the martensitic transformation was observed to start at 294 K with a small volume change ΔV. The effect of hydrostatic pressure on TC and TM was investigated by measuring the temperature dependence of the initial permeability at various pressures up to 9.4 kbar. It was found that TM increases with increasing pressure. By use of the Clausius-Clapeyron equation, the values of dTM/dp and ΔV determined in this study were found to be consistent with the result of the entropy change ΔS, which was estimated by thermoanalysis. On the other hand, TC was found to slightly decrease with increasing pressure, which is a unique behavior compared to other Ni2MnZ (Z = Ga, In, Sn, Sb) alloys. On the basis of the experimental results, the exchange mechanism of the Ni50Mn25.2Fe2.8Ga22 alloy is discussed.
KW - Ferromagnetic shape memory alloy
KW - Heusler alloy
KW - Martensitic transformation
KW - Ni-Mn-Fe-Ga
KW - Pressure effect
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U2 - 10.1016/j.jallcom.2019.01.101
DO - 10.1016/j.jallcom.2019.01.101
M3 - Article
AN - SCOPUS:85060314175
SN - 0925-8388
VL - 785
SP - 484
EP - 490
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -