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The study of magnetic entropy change in Dy(Co1− XMX)2(M=Al, Si, Ga, Ge) compounds

Authors
Journal
Materials Letters
0167-577X
Publisher
Elsevier
Publication Date
Volume
57
Identifiers
DOI: 10.1016/s0167-577x(03)00234-9
Keywords
  • Magnetic Materials
  • Metals And Alloys
  • Dy(Co1− Xmx)2(M=Al Si
  • Ga
  • Ge) Compounds
  • First-Order Phase Transition
  • Second-Order Phase Transition
  • Metamagnetic
  • Magnetic Entropy Change

Abstract

Abstract A series of Dy(Co 1− X M X ) 2 (M=Al Si, Ga, Ge) compounds has been prepared by arc melting method. The X-ray diffraction analysis reveals that all samples are in the MgCu 2-type structure. After the substitution, the Curie temperature increases remarkably. A first-order phase transition changes into a second-order one with increasing X. The magnetic entropy changes as a function of the temperature in a magnetic field of 1 T for Dy(Co 1− X M X ) 2 has been calculated. The origin of the large magnetic entropy change and the potential application of Dy(Co 1− X M X ) 2 as a working material for magnetic refrigerants have been discussed.

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