| Texto completo | |
| 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]
Número total de Autores: 5
|
| 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
Número total de Afiliações: 4
|
| 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 |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |