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Non-Monotonic Variation of Magnetocaloric Effect in the Tm2(Fe,Mn)17 and Tm2Fe16-Tm2Fe19 Systems

The magnetocaloric effect (MCE) of the Tm2Fe17-xMnx (x = 0, 0.2, 0.5, 1, 1.5) and Tm2Fe16, Tm2Fe17, Tm2Fe18, Tm2Fe19 compounds has been investigated by means of magnetic measurements. The MCE exhibits two peaks near the temperatures of ferromagnetic ordering ΘT and TN for Tm2Fe17, Tm2Fe18, Tm2Fe19 compositions or one peak near TC for the Tm2Fe16 and Tm2Fe17-xMnx (x ≥ 0.2) ferromagnets. The peak entropy change -ΔSM varies non-monotonically in the systems, with the maximal values-3.25 J/kg K at T = 310 for Tm2Fe16.8Mn0.2 and-3.5 J/kg K at T = 290 K for Tm2Fe17 in a field of 5 T. On the contrary, the relative cooling power decreases monotonically with decrease of Fe content because of contraction of the -ΔSM peaks.