The Magentocaloric Effect of Gd5Si2Ge2-XZnX Alloy
The structural and magnetic properties of arc-melted alloys of Gd5Si2Ge2-xZnx in vacuum were investigated by powder x-ray diffraction and Vibrating Sample Magnetometer. When the addition amount of Zn substituted for Ge is less than or equal to 0.05, the alloys have monoclinic Gd5Si2Ge2-type phase structure, the magnetic entropy change of Gd5Si2Ge2-xZnx alloys rapidly increase, When x=0.05, the alloy has the excellent magnetic entropy change (|SM|). When the addition amount of Zn substituted for Ge is more than 0.05, the alloys have the orthorhombic Gd5Si4-type phase structure, the magnetic entropy change of Gd5Si2-xGe2-xZnx alloys rapidly decreases. The Curie temperature (Tc) of Gd5Si2Ge2-xZnx alloys linearly increases and the peak of |SM| is broader with the Zn amount substituted for Ge in Gd5Si2Ge2-xZnx alloys in x range from 0-0.15.
Jianzhong Wang and Jingang Qi
X. L. Hou et al., "The Magentocaloric Effect of Gd5Si2Ge2-XZnX Alloy", Advanced Materials Research, Vols. 299-300, pp. 525-529, 2011