Abstract
Non-monotonic variation of the magnetocaloric effect (MCE) with a maximal value for the composition x = 0.7 has been observed in the Lu 2Fe 17− x Mn x system by means of isothermal magnetic measurements. The Lu 2Fe 17− x Mn x compounds with x = 0 –0.5 are ferromagnets at low temperatures and antiferromagnets at high temperatures, with a near-constant Néel temperature T N ∼ 278 K . The temperature of the “ferromagnet–antiferromagnet” phase transition, Θ T , increases rapidly with increasing content of Mn, and the compounds from the range x = 0.7 –2 are ferromagnets only, with the practically unchanged Curie temperature, T C ( 0.7 ) = 287 K . Thus, first- and second-order magnetic transitions merge for the composition Lu 2Fe 16.3Mn 0.7, where the associated entropy change | Δ S M | is 3.6 J/kg K at 300 K in a field of 5 T. This is a way of enhancing the MCE in such multicomponent systems.
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