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The effect of the short milling times on R5(Si,Ge)4 R =Gd, Tb magnetocaloricmaterial properties was investigated. In particular, the effect of milling onatomic structure, particles size and morphology, magnetic, and magnetocaloriceffect was studied. With short milling times (< 2.5h), a reduction of theGd5Si1.3Ge2.7 and Tb5Si2Ge2 particles size was achieved down to approximately3.5 DSm. For both compositions the main differences are a consequence of themilling effect on the coupling of the structural and magnetic transitions. Inthe Gd5Si1.3Ge2.7 case, a second-order phase transition emerges at hightemperatures as a result of ball milling. Consequently, there is a decrease inthe magnetocaloric effect of 35% after 150 minutes of milling. Interestingly,an opposite effect is observed in Tb5Si2Ge2 where a 23% increase of themagnetocaloric effect was achieved, driven by the enhancement of the couplingbetween magnetic and structural transitions arising from internal strainpromoted by the milling process.

Influence of short time milling in R5(Si,Ge)4, R =Gd and Tb, magnetocaloric materials