Magnetocaloric properties of DyCo2−xGax alloys |
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Authors: | WQ Ao JQ Li FS Liu YX Jian |
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Institution: | a College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, PR China b Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, PR China c Physics and Electronic Engineering Institute, Guangxi University for Nationalities, Nanning Guangxi, 530006, PR China |
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Abstract: | The influence of the substitution of Ga atoms for Co atoms in DyCo2 compounds on magnetocaloric properties has been investigated. A series of DyCo2−xGax alloys with x=0, 0.03, 0.06, 0.1, 0.15, and 0.2 was prepared by the arc-melting method for this investigation. Experimental results revealed that the Ga substitution for Co in DyCo2 can form a single phase with the cubic Laves phase structure up to x=0.2. As the Ga content x increases, the lattice parameter and the Curie temperature Tc increases from 143 to 196 K linearly. The maximum magnetic entropy changes in a low field change of 0-1.5 T, increasing from 8.24 to 10.61 J/K kg when the Ga content x increases from 0 to 0.03, but decreasing gradually to 3.51 J/K kg as the Ga content further increases to x=0.2. All the samples show a relatively large magnetic entropy change with very small hysteresis loss. |
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Keywords: | 71 20 Eh 71 20 Lp 74 25 Ha 75 30 Sg |
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