Faculty Publications

Crystal Structure, Magnetism And Magnetocaloric Properties Of Mn2−Xsn0.5Ga0.5 (X = 0, 0.3, 0.5, 0.8) Alloys

Document Type

Article

Journal/Book/Conference Title

Journal of Magnetism and Magnetic Materials

Volume

471

First Page

411

Last Page

415

Abstract

Magnetic refrigeration based on the magnetocaloric effect has attracted recent attention due to advantages such as high efficiency and environmental friendliness. We have investigated the structural, magnetic and magnetocaloric properties of Mn2−xSn0.5Ga0.5 (x = 0, 0.3, 0.5, 0.8) alloys prepared using arc-melting and melt-spinning techniques with prospects for magnetic refrigeration. The Mn2−xSn0.5Ga0.5 alloys, except for Mn1.2Sn0.5Ga0.5, have a single-phase hexagonal crystal structure. The Mn1.2Sn0.5Ga0.5 alloy also contains a small amount of MnSn2 impurity phase. The Curie temperature and high-field (30 kOe) magnetization at 55 K decrease with increasing Mn concentration from 306 K and 64.1 emu/g (1.07 µB/Mn) for Mn1.2Sn0.5Ga0.5 to 262 K and 46.7 emu/g (0.85 µB/Mn) for Mn2Sn0.5Ga0.5, respectively. The peak values of magnetic entropy change are relatively small with ΔSM,max=1.7 Jkg−1K−1 for Mn1.5Sn0.5Ga0.5 at 30 kOe. Despite this, these materials show considerable relative cooling power (RCP) along with a wide working temperature range near room temperature and negligible magnetic and thermal hysteresis, where Mn1.2Sn0.5Ga0.5 shows a highest RCP of 102.3 Jkg−1 at 30 kOe.

Department

Department of Physics

Original Publication Date

2-1-2019

DOI of published version

10.1016/j.jmmm.2018.09.123

Repository

UNI ScholarWorks, Rod Library, University of Northern Iowa

Language

en

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