Effects of Fe substitution on Mn2Sn alloy on its structural, magnetic and magnetocaloric properties

Autor(es)

Felez, Marissol R. ^[1] ; Monteiro, Jose Carlos B. ^{[1, 2]} ; de Florio, Daniel Z. ^[3] ; Gandra, Flavio C. G. ^[1] ; Gama, Sergio ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[2] Univ Fed Maranhao, CCSST, BR-65900410 Imperatriz, MA - Brazil

^[3] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, BR-09210580 Sao Paulo, SP - Brazil

^[4] Univ Fed Sao Paulo, Dept Ciencias Exatas & Terra, BR-09910720 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Magnetism and Magnetic Materials; v. 505, JUL 1 2020.
• Citações Web of Science: 0

Resumo

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. (AU)

• Processo FAPESP: 15/24999-2 - Novos compostos cerâmicos para células a combustível de óxidos sólidos protônicas
• Beneficiário: Daniel Zanetti de Florio
• Linha de fomento: Auxílio à Pesquisa - Regular