Magnetic and magnetocaloric properties of Mn{sub 4–x}Fe{sub x}Ga₂Sn
- Baotou Research Institute of Rare Earths, Baotou 014030 (China)
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.
- OSTI ID:
- 22305961
- Journal Information:
- Journal of Applied Physics, Vol. 116, Issue 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Phase transitions and magnetocaloric and transport properties in off-stoichiometric GdNi{sub 2}Mn{sub x}
The crystal and magnetic structure of the magnetocaloric compound FeMnP{sub 0.5}Si{sub 0.5}