The Effect of Step-Like Martensitic Transformation on the Magnetic Entropy Change of Ni_40.6Co_8.5Mn_40.9Sn₁₀ Unidirectional Crystal Growth with the Bridgman-Stockbarger Technique

Authors

F. Chen, Harbin Engineering University
Y. X. Tong, Harbin Engineering University
L. Li, Harbin Engineering University
J. L. Sánchez Llamazares, Instituto Potosino de Investigación Científica y Tecnológica A.C.
C. F. Sánchez-Valdés, Universidad Nacional Autónoma de México
P. Müllner, Boise State UniversityFollow

Document Type

Article

Publication Date

1-15-2017

Abstract

We report a step-like martensitic transformation and its effect on magnetocaloric properties in Ni_40.6Co_8.5Mn_40.9Sn₁₀ 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 (δT_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 δT_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%.

Publication Information

Chen, F.; Tong, Y. X.; Li, L.; Sánchez Llamazares, J. L.; Sánchez-Valdés, C. F.; and Müllner, P.. (2017). "The Effect of Step-Like Martensitic Transformation on the Magnetic Entropy Change of Ni_40.6Co_8.5Mn_40.9Sn₁₀ Unidirectional Crystal Growth with the Bridgman-Stockbarger Technique". Journal of Alloys and Compounds, 691, 269-274. https://doi.org/10.1016/j.jallcom.2016.08.240