Metals 2013, 3(2), 225-236; doi:10.3390/met3020225
Article

Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys

1 Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan 2 Faculty of Engineering, Tohoku Gakuin University, Tagajo 985-8537, Japan 3 Research Institute for Engineering and Technology, Tohoku Gakuin University, Tagajo 985-8537, Japan 4 Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan 5 Faculty of Science, Shinshu University, Matsumoto 390-8621, Japan 6 Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
* Author to whom correspondence should be addressed.
Received: 10 April 2013; in revised form: 20 May 2013 / Accepted: 23 May 2013 / Published: 3 June 2013
(This article belongs to the Special Issue Shape Memory Alloys)
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Abstract: In order to investigate the Fe substituted effects on the magnetic properties of the Ni-Mn-Sn metamagnetic shape memory alloys, magnetization and the Mössbauer spectroscopy measurements were carried out with using 57Fe-doped specimens of Ni2Mn1.48−x57FexSn0.52 (x = 0.02, 0.04 and 0.08). Singlet-type Mössbauer spectra were clearly observed for x = 0.02 and 0.04 just below the martensitic transformation temperature, TM, and above the Curie temperature, TC, in the austenite phase. It was clear that the magnetic state in the martensite phase just below TM was paramagnetic for x = 0.02 and 0.04. In further doped 57Fe to Ni2Mn1.48Sn0.52, TC in the austenite phase slightly increased. However, the value of TM significantly decreased. As a result, martensite phase with small spontaneous magnetization directly transformed to the ferromagnetic austenite phase during heating for x = 0.08. These results obtained from the Mössbauer spectra were consistent with the results of the magnetic measurements in this study and the phase diagram reported by Fukushima et al. for normal Fe-doped Ni2Mn1.48−xFexSn0.52 alloys. The breakdown of the general rule, in which the ferromagnetic shape memory alloys with larger value of the valence electrons per atom, e/a, showed higher TM, was also appeared in Ni2Mn1.48−xFexSn0.52 alloys, being similar to Ni2Mn1−xFexGa alloys.
Keywords: metamagnetic shape memory alloy; mössbauer spectroscopy; heusler alloy; martensitic transformation; austenite phase

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MDPI and ACS Style

Umetsu, R.Y.; Sano, K.; Fukushima, K.; Kanomata, T.; Taniguchi, Y.; Amako, Y.; Kainuma, R. Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys. Metals 2013, 3, 225-236.

AMA Style

Umetsu RY, Sano K, Fukushima K, Kanomata T, Taniguchi Y, Amako Y, Kainuma R. Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys. Metals. 2013; 3(2):225-236.

Chicago/Turabian Style

Umetsu, Rie Y.; Sano, Kenji; Fukushima, Kouji; Kanomata, Takeshi; Taniguchi, Yusuke; Amako, Yasushi; Kainuma, Ryosuke. 2013. "Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys." Metals 3, no. 2: 225-236.

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