Low hysteresis and large room temperature magnetocaloric effect of Gd5Si2.05−xGe1.95−xNi2x (2x = 0.08, 0.1) alloys | Zendy

Xichun Zhong | Zendy; J.X. Min | Zendy; Liu Hon | Zendy; Z.G. Zheng | Zendy; Dechang Zeng | Zendy; V. Franco | Zendy; R.V. Ramanujan | Zendy

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Low hysteresis and large room temperature magnetocaloric effect of Gd5Si2.05−xGe1.95−xNi2x (2x = 0.08, 0.1) alloys

Author(s) -

Xichun Zhong,

J.X. Min,

Liu Hon,

Z.G. Zheng,

Dechang Zeng,

V. Franco,

R.V. Ramanujan

Publication year - 2013

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4795434

Subject(s) - magnetic refrigeration , materials science , orthorhombic crystal system , arc melting , thermal hysteresis , alloy , magnetic hysteresis , annealing (glass) , condensed matter physics , monoclinic crystal system , hysteresis , phase transition , magnetization , crystallography , thermodynamics , crystal structure , magnetic field , metallurgy , chemistry , physics , quantum mechanics

Gd5Si2.05-xGe1.95-xNi2x (2x ¼ 0.08, 0.1) alloys were prepared by arc melting followed by annealing at 1273 K for 96 h. Mixed monoclinic Gd5Si2Ge2-type phase, orthorhombic Gd5Si4-type phase, and a small amount of Gd5Si3-type phase were obtained in these alloys. Gd5Si2.01Ge1.91Ni0.08 alloy undergoes a second-order transition (TC) around 300 K, whereas Gd5Si2Ge1.9Ni0.1 alloy exhibits two II I transitions including a first-order transition (TC ) at rv295 K and second-order transition (TC ) at rv301 K. Ni substitution can effectively reduce the thermal hysteresis and magnetic hysteresis while max maintaining large magnetic entropy change. The maximum magnetic entropy changes (|DSM |) of 1 -1 Gd5Si2.05-xGe1.95-xNi2x alloys with 2x ¼ 0.08 and 0.1 are 4.4 and 5.0 J kg-K, 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

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