Magnetic properties of Mn3-xFexSn compounds with tuneable Curie temperature by Fe content for thermomagnetic motors

Author(s)

Felez, Marissol R. ^[1] ; Coelho, Adelino A. ^[2] ; Gama, Sergio ^[1]

Affiliation

^[1] UNIFESP, Lab Mat & Mfg Mecan Isaias da Silva, BR-09910720 Diadema, SP - Brazil

^[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Dept Fis Aplicada, Lab Mat & Baixas Temp, BR-13083859 Campinas, SP - Brazil

• Document type: Journal article
• Source: Journal of Magnetism and Magnetic Materials; v. 444, p. 280-283, DEC 15 2017.
• Web of Science Citations: 4

Abstract

Mn3-xFexSn system (0.00 <= x <= 3.00 with Delta x = 0.25) alloys present the Curie temperature (T-C) or transition temperature (T-T) tuneable by the Fe content. A piece-wise linear profile for T-C,T-T as a function of x is observed in a two wide temperature ranges, between 155 K up to 759 K and 259 K up to 155 K. Their equations are T-C,T-T = (59 +/- 15) + (240 +/- 7) . x and T-C,T-T = (257 +/- 1) - (206 +/- 4) . x, respectively. The alloys are low cost and easy manufacturing, rare earth free, with second order magnetic transition (SOMT), and have good magnetic properties. These features suggest an immediate application of the material in cascade thermomagnetic motors that operate with a large temperature range between hot and cold sources. Furthermore, SOMT Mn-Fe-Sn system materials are also reported with advantages that could make alloys of the Mn3-xFexSn system, (0.88 < x < 1.20), promising candidate for magnetic refrigeration. The typical ferromagnetic behaviour is achieved only by samples with x >= 1. The samples with x between 0.00 and 0.75 do not show the saturation magnetization even using fields up to 13 T. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 15/26799-0 - Development of Tesla type Thermomagnetic Motors Driven by Solar Energy or by Industrial Thermal Rejects - Part III
• Grantee: Sergio Gama
• Support Opportunities: Regular Research Grants