skip to main content

SciTech ConnectSciTech Connect

Title: Magnetic and magnetocaloric properties of Mn{sub 4–x}Fe{sub x}Ga₂Sn

We investigate the magnetic and magnetocaloric properties of the new Mn{sub 4–x}Fe{sub x}Ga₂Sn compounds (x = 0, 0.1, 0.4, 0.6, and 0.8) from DC magnetization measurements. These phases crystallize in a lacunar form of the η-Fe{sub 2–x}Ge type of structure (P6₃/mmc). They present a second-order paramagnetic to ferromagnetic transition whose temperature increases upon increasing the Fe content from TC=317 K for x=0 up to TC=411 K for x=0.8. The alloys with x≤0.4 further exhibit another transition at lower temperature associated with a spin reorientation. The maximal magnetization and magnetic entropy change are found almost constant throughout the series close to ~7.4 μB/f.u. and ~12 mJ cm³ K⁻¹ (for μ₀ΔH=2.4 T), respectively. The magnetocaloric properties of Mn{sub 4–x}Fe{sub x}Ga₂Sn are compared with those of previously investigated materials with high-temperature magnetic transition and their potential interest for high-temperature magnetocaloric applications is briefly discussed.
Authors:
; ;  [1] ;  [2]
  1. Institut Jean Lamour, CNRS UMR 7198, Université de Lorraine, B.P. 70239, 54506 Vandoeuvre-lès-Nancy (France)
  2. Baotou Research Institute of Rare Earths, Baotou 014030 (China)
Publication Date:
OSTI Identifier:
22305961
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALORIMETRY; ENTROPY; GALLIUM COMPOUNDS; HCP LATTICES; IRON COMPOUNDS; MAGNETIC PROPERTIES; MAGNETIZATION; MANGANESE COMPOUNDS; PARAMAGNETISM; QUATERNARY ALLOY SYSTEMS; SPIN; TIN COMPOUNDS