Giant magnetocaloric effect in Tb5Ge2-xSi2-xMn2x compounds |
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Authors: | E Yuzuak B Emre Y Elerman A Yucel |
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Institution: | Department of Engineering Physics, Faculty of Engineering, Ankara
University, 06100 Besevler, Ankara, Turkey; Faculty of Science and Letters, Physics Department, Mugla University,
K\"{otekli 48000 Mugla, Turkey |
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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. |
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Keywords: | magnetic properties magnetocaloric effect isothermal magnetic entropy change |
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