Effect of Nd Substitution on the Structural and Magnetocaloric Properties of Gd5Si2Ge2

Bhagya Uthaman; Manoj Raama Varma

doi:10.4028/www.scientific.net/MSF.830-831.501

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HomeMaterials Science ForumMaterials Science Forum Vols. 830-831Effect of Nd Substitution on the Structural and...

Effect of Nd Substitution on the Structural and Magnetocaloric Properties of Gd₅Si₂Ge₂

Abstract:

In the present work, Nd substituted Gd_5-xNd_xSi₂Ge₂ with x = 0.05, 0.1 and 0.2 have been synthesized by arc melting and the effect of Nd substitution on the structural and magnetocaloric properties of Gd₅Si₂Ge₂ has been investigated. The composition with x=0.05 undergoes a first order phase transition with a Curie temperature of 275 K. With the increase in Nd content to x=0.1 and x=0.2, the compounds undergo a second order magnetic transition at 300 K and 293 K respectively. Maximum entropy changes (-ΔS_M) for Gd_5-xNd_xSi₂Ge₂ alloys with x = 0.05, 0.1 and 0.2 are 12.8, 7.6 and 7.2 J/kg K, respectively, for 50 kOe. The critical exponent analysis of the paramagnetic to ferromagnetic transition and the scaling behaviour of field dependence of MCE for x=0.1 and 0.2 compositions is also carried out.