The influence of the manganese-alloying on the structure and magnetocaloric properties of the Gd5Si2.05Ge1.95 compound was studied by X-ray powder diffraction and magnetization measurements.The Gd5Si2.05-xGe1.95-xMn2x(2x=0,0.03 and 0.08)compounds crystallized in the Gd5Si2Ge2-type monoclinic structure.In all X-ray powder diffraction patterns,a minor hexagonal Gd5Si3 phase was observed as a second phase.With increasing Mn content,the unit cell volume increased.For the compounds with x=0,0.03 and 0.08,the first order phase transition was observed.The maximum isothermal magnetic entropy change of the Gd5Si2.05-xGe1.95-xMn2x compound with 2x=0.03 at 275 K was found to be-11.6 J/(kg·K)in an applied field of 5 T.
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