Agradecimentos: The authors are grateful to UNICAMP and Multiuser Central Facilities from UFABC, for the experimental support. M.R. Felez acknowledge to CNPq (153708/2018-2) for scholarship. D.Z. Florio acknowledge to FAPESP (2015/24999-2) and CNPq (309600/2018-9). J.C. B. Monteiro would like to thank CAPES support (88882.315473/2019-01) Ver menos

Abstract: The effects of Fe substitution on Mn site of Mn2Sn compound was investigated by means of scanning electron microscopy with X-ray energy dispersive spectrometer, X-ray diffraction, magnetization and magnetocaloric measurements. The produced Mn2-yFeySn series (0.50 <= y <= 1.75) presented two phases, a major non-stoichiometric Mn2-xSn and a minor Mn3Sn, respectively, with Fe content replacing Mn in each phase. The lattice parameters a and c of Mn2-xSn and Mn3Sn phases decrease approximately linearly with Fe concentration while their transition temperatures increase covering a wide temperature range from 177 K to 546 K (major phase T-C1) and 260 K to 704 K (minor phase T-C2) resulting in alloys with two distinct values of T-C. The magnetization measurements show a ferromagnetic coupling and saturation magnetization increases along the series. The heat flux analyses determined second order of magnetic transitions and magnetocaloric effect was calculated with vertical bar Delta S vertical bar around 1 J/kg.K. The cooling power was estimated in 85 J/kg. Both values were for mu(0)Delta H = 2 T. Thereby, for technological devices which have their efficient improved using layered materials, Mn2-yFeySn alloys are valid candidates since the association of its properties allow to yield a powerful magnetic and magnetocaloric material, and, besides, they are low cost, non-toxic, absent of rare-earth and easy to manufacture Ver menos