The new ternary silicide Gd5CoSi2: Structural, magnetic and magnetocaloric properties

Abstract : Gd5CoSi2 was prepared by annealing at 1003 K. Its investigation by the X-ray powder diffraction shows that the ternary silicide crystallizes in a tetragonal structure deriving from the Cr5B3-type (I4/mcm space group; a=7.5799(4) and c=13.5091(12) Å as unit cell parameters). The Rietveld refinement shows a mixed occupancy on the (8h) site between Si and Co atoms. Magnetization and specific heat measurements performed on Gd5CoSi2 reveal a ferromagnetic behaviour below TC=168 K. This magnetic ordering is associated to an interesting magnetocaloric effect; the adiabatic temperature change ΔTad is about 3.1 and 5.9 K, respectively, for a magnetic field change of 2 and 4.6 T.
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Submitted on : Friday, February 11, 2011 - 4:33:35 PM
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Charlotte Mayer, Etienne Gaudin, Stéphane Gorsse, Bernard Chevalier. The new ternary silicide Gd5CoSi2: Structural, magnetic and magnetocaloric properties. Journal of Solid State Chemistry, Elsevier, 2011, 184 (2), pp.325-330. ⟨10.1016/j.jssc.2010.11.023⟩. ⟨hal-00565319⟩

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