Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 691, Issue -, Pages 269-274Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.08.240
Keywords
Ni-Co-Mn-Sn; Ferromagnetic shape memory alloy; Step-like martensitic transformation; Magnetic entropy change; Magnetic hysteresis losses
Categories
Funding
- National Natural Science Foundation of China [51101040]
- Fundamental Research Funds for the Central Universities [HEUCF20151002]
- State Scholarship Fund of China [201303070335]
- National Science Foundation [DMR-1207192]
- CONACYT, Mexico [CB-2010-01-156932, 157541]
- Laboratorio Nacional de Investigaciones en Nanociencias y Nanotecnologia (LINAN), IPICYT
- CTIC-UNAM
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1207192] Funding Source: National Science Foundation
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We report a step-like martensitic transformation and its effect on magnetocaloric properties in Ni40.6Co8.5Mn40.9Sn10 unidirectional crystal grown using the Bridgman-Stockbarger technique followed by vacuum annealing at 1173 K for 72 h. This alloy undergoes successive first-order phase transitions which are attributed to the monotonic compositional variation along the crystal growth direction; the latter results in the increase of the full-width at half-maximum of the magnetic entropy change as a function of temperature (delta T-FWHM). For a magnetic field change of 2 and 5 T, the maximum magnetic entropy change are 9.7 and 16.0 J kg(-1) K-1 with an extended delta T-FWHM of 11 and 23 K, respectively. The average hysteresis loss for a field change of 2 T is 19 J kg(-1) reducing the refrigerant capacity by 17%. (C) 2016 Elsevier B.V. All rights reserved.
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