Low hysteresis and large room temperature magnetocaloric effect of Gd5 Si2.05−x Ge1.95−x Ni2x (2x = 0.08, 0.1) alloys
Zhong, X. C.
Min, J. X.
Liu, Z. W.
Zheng, Z. G.
Zeng, D. C.
Ramanujan, Raju Vijayaraghavan
Date of Issue2013
School of Materials Science and Engineering
Gd5Si2.05− x Ge 1.95− x Ni 2 x (2x = 0.08, 0.1) alloys were prepared by arc melting followed by annealing at 1273 K for 96 h. Mixed monoclinic Gd5Si2 Ge 2-type phase, orthorhombic Gd5Si4-type phase, and a small amount of Gd5Si3-type phase were obtained in these alloys. Gd5Si2.01 Ge 1.91 Ni 0.08 alloy undergoes a second-order transition (T C) around 300 K, whereas Gd5Si2 Ge 1.9 Ni 0.1 alloy exhibits two transitions including a first-order transition (T C ІІ) at ∼295 K and second-order transition (T C І) at ∼301 K. Ni substitution can effectively reduce the thermal hysteresis and magnetic hysteresis while maintaining large magnetic entropy change. The maximum magnetic entropy changes (|ΔSM max|) of Gd5Si2.05− x Ge 1.95− x Ni 2 x alloys with 2x = 0.08 and 0.1 are 4.4 and 5.0 J kg−1 K−1, respectively, for 0–2 T, and are 8.0 and 9.1 J kg−1 K−1, respectively, for 0–5 T. Low hysteresis performance and relatively large magnetic entropy change make these alloys favorable for magnetic refrigeration applications.
Materials Science and Engineering
Journal of applied physics
© 2013 American Institute of Physics. This paper was published in Journal of Applied Physics and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at the following official DOI: [http://dx.doi.org/10.1063/1.4795434]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.