Abstract

We have carried out the study of magnetocaloric effect for as-quenched and annealed <TEX>$Fe_{91-x}Y_xZr_9$</TEX> alloys. Samples were prepared by arc melting the high-purity elemental constituents under argon gas atmosphere and by single roller melt spinning. These alloys were annealed one hour at 773 K in vacuum chamber. The magnetization behaviours of the samples were measured by vibrating sample magnetometer. The Curie temperature increases with increasing Y concentration (x=0 to 8). Temperature dependence of the entropy variation <TEX>${\Delta}S_M$</TEX> was found to appear in the vicinity of the Curie temperature. The results show that annealed <TEX>$Fe_{86}Y_5Zr_9$</TEX> and <TEX>$Fe_{83}Y_8Zr_9$</TEX> alloys a bigger magnetocaloric effect than that those in as-quenched alloys. The value is 1.23 J/kg K for annealed <TEX>$Fe_{86}Y_5Zr_9$</TEX> alloy and 0.89 J/kg K for as-quenched alloy, respectively. In addition, the values of <TEX>${\Delta}S_M$</TEX> for <TEX>$Fe_{83}Y_8Zr_9$</TEX> alloy is 0.72 J/Kg K for as-quenched and 1.09 J/Kg K for annealed alloy, respectively.

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