Chinese Science Bulletin

, Volume 50, Issue 16, pp 1811–1814 | Cite as

The giant magnetocaloric effect in Gd5Si2Ge2 with low purity gadolinium

  • Tiebang Zhang
  • Yungui Chen
  • Hao Fu
  • Baohua Teng
  • Yongbai Tang
  • Mingjing Tu
Brief Communications

Abstract

The giant magnetocaloric effect Gd5Si2Ge2 alloy was prepared with 99wt% low purity commercial Gd. Powder XRD and magnetic measurements showed that the Gd5Si2Ge2 alloy annealed at 1200°C for 1 h had a significant magneticcrystallographic first order phase transition at about 270 K. The maximal magnetic entropy change is 17.55 J · kg−1 · K−1 under a magnetic field change of 0–5 T. The distinct increase of magnetic entropy change belongs to the first-order phase transition from the orthorhombic Gd5Si4-type to the monoclinic Gd5Si2Ge2-type after high temperature heat-treatment.

Keywords

magnetic refrigerant Gd5Si2Ge2 magnetocaloric effect 

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Copyright information

© Science in China Press 2005

Authors and Affiliations

  • Tiebang Zhang
    • 1
  • Yungui Chen
    • 1
  • Hao Fu
    • 1
  • Baohua Teng
    • 2
  • Yongbai Tang
    • 1
  • Mingjing Tu
    • 1
  1. 1.School of Materials Science and EngineeringSichuan UniversityChengduChina
  2. 2.Department of PhysicsNational University of SingaporeSingaporeRepublic of Singapore

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