Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/100/14116
Title: Effect of Si/Ge ratio on resistivity and thermopower in Gd(5)Si(x)Ge(4-x) magnetocaloric compounds
Authors: KUMAR, DMR
RAJA, MM
PRABAHAR, K
CHANDRASEKARAN, V
PODDAR, A
RANGANATHAN, R
SURESH, KG
Keywords: Transport-Properties
Gd-5(Sixge1-X)(4)
Phases
Gd-5(Si2ge2)
Transition
Alloys
Issue Date: 2011
Publisher: ELSEVIER SCIENCE BV
Citation: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,323(13)1750-1754
Abstract: The effect of Si/Ge ratio on resistivity and thermopower behavior has been investigated in the magnetocaloric ferromagnetic Gd(5)Si(x)Ge(4-x) compounds with x = 1.7-2.3. Microstructural studies reveal the presence of Gd(5)(Si, Ge)(4)-matrix phase (5:4-type) along with traces of secondary phases (5:5 or 5:3-type). The x = 1.7 and 2.0 samples display the presence of a first order structural transition from orthorhombic to monoclinic phase followed by a magnetic transition of the monoclinic phase. The alloys with x = 2.2 and 2.3 display only magnetic transitions of the orthorhombic phase. A low temperature feature apparent in the AC susceptibility and resistivity data below 100 K reflects an antiferromagnetic transition of secondary phase(s) present in these compounds. The resistivity behavior study correlates with microstructural studies. A large change in thermopower of -8 mu V/K was obtained at the magneto-structural transition for the x = 2 compound. (C) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jmmm.2011.01.017
http://dspace.library.iitb.ac.in/jspui/handle/100/14116
ISSN: 0304-8853
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