中国物理B ›› 2010, Vol. 19 ›› Issue (5): 57501-057501.doi: 10.1088/1674-1056/19/5/057501

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Giant magnetocaloric effect in Tb5Ge2-xSi2-xMn2x compounds

E.Yüzüak1, B.Emre1, Y.Elerman}1, A.Yücel2   

  1. (1)Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Besevler, Ankara, Turkey; (2)Faculty of Science and Letters, Physics Department, Mugla University, K\ötekli 48000 Mugla, Turkey
  • 收稿日期:2009-05-19 修回日期:2009-09-17 出版日期:2010-05-15 发布日期:2010-05-15
  • 基金资助:
    Project supported by the Scientific and Technological Research Council of Turkey under Project No. 104T382.

Giant magnetocaloric effect in Tb5Ge2-xSi2-xMn2x compounds

E. Yüzüaka)†, B. Emrea), Y. Elermana), and A. Yücelb)   

  1. a Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Besevler, Ankara, Turkey; b Faculty of Science and Letters, Physics Department, Mugla University, K?tekli 48000 Mugla, Turkey
  • Received:2009-05-19 Revised:2009-09-17 Online:2010-05-15 Published:2010-05-15
  • Supported by:
    Project supported by the Scientific and Technological Research Council of Turkey under Project No. 104T382.

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摘要： The crystal structure, magnetic and magnetocaloric characteristics of the pseduo ternary compounds of Tb$_{5}$Ge$_{2-x}$Si$_{2-x}$Mn$_{2x}$ (0 $\leq $ 2$x$ $\leq$ 0.1) were investigated by x-ray powder diffraction and magnetization measurements. The x-ray powder diffraction results show that all compounds preserve the monoclinic phase as the majority phase and all the synthesized compounds were observed to be ferromagnetic from magnetization measurements. Magnetic phase transitions were interpreted in terms of Landau theory. Maximum isothermal magnetic entropy change value (20.84~J\,$\cdot$\,kg$^{-1}$\,$\cdot$\,K$^{-1}$) was found for Tb$_{5}$Ge$_{1.95}$Si$_{1.95}$Mn$_{0.1}$ at around 123~K in the magnetic field change of 5~T.

Abstract: The crystal structure, magnetic and magnetocaloric characteristics of the pseduo ternary compounds of Tb$_{5}$Ge$_{2-x}$Si$_{2-x}$Mn$_{2x}$ (0 $\leq $ 2$x$ $\leq$ 0.1) were investigated by x-ray powder diffraction and magnetization measurements. The x-ray powder diffraction results show that all compounds preserve the monoclinic phase as the majority phase and all the synthesized compounds were observed to be ferromagnetic from magnetization measurements. Magnetic phase transitions were interpreted in terms of Landau theory. Maximum isothermal magnetic entropy change value (20.84 J$\cdot$kg$^{-1}$$\cdot$K$^{-1}$) was found for Tb$_{5}$Ge$_{1.95}$Si$_{1.95}$Mn$_{0.1}$ at around 123 K in the magnetic field change of 5 T.

Key words: magnetic properties, magnetocaloric effect, isothermal magnetic entropy change

中图分类号:  (Magnetocaloric effect, magnetic cooling)

  • 75.30.Sg
75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 61.05.cp (X-ray diffraction) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 61.66.Dk (Alloys ) 75.50.Cc (Other ferromagnetic metals and alloys)