1. Tuning the structural and magnetocaloric properties of Gd5Si2Ge2 with Nd substitution
- Author
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K.G. Suresh, Senoy Thomas, Bhagya Uthaman, G. R. Raji, and Manoj Raama Varma
- Subjects
System ,Phase transition ,Materials science ,Condensed matter physics ,Magnetic Refrigeration ,Gd-5(Si2ge2) ,Compound ,Gd5si4-Gd5ge4 ,Analytical chemistry ,General Physics and Astronomy ,Space group ,Field ,Crystal structure ,Gd5ge2si2 ,Phase (matter) ,Transition ,Magnetic refrigeration ,Alloys ,Curie temperature ,Orthorhombic crystal system ,Phase-Relationships ,Monoclinic crystal system - Abstract
Structural and magnetocaloric properties of Nd substituted Gd5-xNdxSi2Ge2 with x = 0.05, 0.1, and 0.2 have been investigated. The composition with x = 0.05 crystallizes in monoclinic Gd5Si2Ge2 structure with P112(1)/a space group and undergoes a first order phase transition with a Curie temperature of 275 K. With increase in Nd content to x = 0.1, the compound is found to stabilize in orthorhombic Gd5Si4 phase with Pnma space group. The compounds with x = 0.1 and 0.2 undergoes a second order magnetic transition at 300K and 293 K, respectively. Temperature variation of maximum entropy change for Gd5-xNdxSi2Ge2 alloys with x = 0.05, 0.1, and 0.2 are 7.9, 3.7, and 3.2 J/kg K, respectively, for a field change of 20 kOe, and 12.8, 7.6, and 7.2 J/kg K, respectively, for 50 kOe. A large relative cooling power of 295, 205, and 188 J/kg are obtained for x = 0.05, 0.1, and 0.2, respectively, fulfilling the required criteria for a potential magnetic refrigerant in the room temperature regime. (C) 2015 AIP Publishing LLC.
- Published
- 2015