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Tuning the structural and magnetocaloric properties of Gd5Si2Ge2 with Nd substitution

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Title Tuning the structural and magnetocaloric properties of Gd5Si2Ge2 with Nd substitution
 
Creator UTHAMAN, B
RAJI, GR
THOMAS, S
SURESH, KG
VARMA, MR
 
Subject MAGNETIC REFRIGERATION
PHASE-RELATIONSHIPS
TRANSITION
ALLOYS
GD-5(SI2GE2)
COMPOUND
GD5SI4-GD5GE4
GD5GE2SI2
SYSTEM
FIELD
 
Description 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.
 
Publisher AMER INST PHYSICS
 
Date 2016-01-15T07:38:33Z
2016-01-15T07:38:33Z
2015
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 117(1)
0021-8979
1089-7550
http://dx.doi.org/10.1063/1.4905544
http://dspace.library.iitb.ac.in/jspui/handle/100/18070
 
Language en