Akademik Veri Yönetim Sistemi
Chinese Physics B, cilt.19, sa.3, 2010 (SCI-Expanded)
The magnetocaloric properties of the Gd5Ge 2.025Si1.925In0.05 compound have been studied by x-ray diffraction, magnetic and heat capacity measurements. Powder x-ray diffraction measurement shows that the compound has a dominant phase of monoclinic Gd5Ge2Si2-type structure and a small quantity of Gd5(Ge,Si)3-type phase at room temperature. At about 270 K, this compound shows a first order phase transition. The isothermal magnetic entropy change (ΔSM) is calculated from the temperature and magnetic field dependences of the magnetization and the temperature dependence of MCE in terms of adiabatic temperature change (ΔTad) is calculated from the isothermal magnetic entropy change and the temperature variation in zero-field heat-capacity data. The maximum ΔSM is -13.6 Jkg-1K-1 and maximum ΔTad is 13 K for the magnetic field change of 0-5 T. The Debye temperature (θD) of this compound is 149 K and the value of DOS at the Fermi level is 1.6 states/eVatom from the low temperature zero-field heat-capacity data. A considerable isothermal magnetic entropy change and adiabatic temperature change under a field change of 0-5 T jointly make the Gd5Ge2.025Si1.925In0.05 compound an attractive candidate for a magnetic refrigerant. © 2010 Chinese Physical Society and IOP Publishing Ltd.