Giant magneto-caloric effect near room temperature in Ni-Mn-Sn-Ga alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:503

Article

Chatterjee, S.^1,2  Giri, S.^1,2  De, S. K.³  Majumdar, S.^1,2 

[1] Indian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India

[2] Indian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India

[3] Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, India

关键词: Ferromagnetic shape memory alloys;    Martensitic transition;    Magneto-caloric effect;   

DOI  :  10.1016/j.jallcom.2010.05.026

来源: Elsevier

【 摘 要 】

We report the observation of giant magneto-caloric effect (MCE) in ferromagnetic shape memory alloys (FSMAs) of nominal compositions Ni2Mn1.36Sn0.64-xGax (x = 0.24, 0.28 and 0.32). Irrespective of the Ga doping, all the samples undergo long range magnetic ordering below around 330 K. However, the martensitic transition temperature (T-MS) of the samples varies strongly with Ga concentration. Clear signature of field-induced transition around T-MS is visible for all the samples. The observed MCE (Delta S = 13.6J/(kg K) for field changing from 0 to 50 kOe) is found to be highest for x = 0.28 with peak near 249K, while x = 0.32 shows Delta S = 12.8J/(kg K) at 274K. This series of Ga-doped alloys are found to be interesting materials with high value of Delta S over a varied range of temperature. (C) 2010 Elsevier B.V. All rights reserved.

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