Application of Large Magnetocaloric Effects in Itinerant-Electron Metamagnets to Cooling Systems
The La(FexSi1-x)13 compounds exhibit large magnetocaloric effects (MCEs) due to the itinerant-electron metamagnetic (IEM) transition. By hydrogen absorption, the Curie temperature TC increases up to room temperature with retaining the IEM transition. The La(Fe0.90Si0.10)13H1.1 compound indicates a large isothermal magnetic entropy change of ∆Sm = - 28 J/kg K at 287 K in the magnetic field change from 0 to 2 T (∆B = 2 T). In addition, the MCEs are enhanced by partial substitution of Ce for La. The value of TC for La(FexSi1-x)13 is decreased by partial substitution of Mn for Fe, keeping excellent MCEs. Consequently, the La(FexSi1-x)13 and their modified compounds are promising as magnetic refrigerants working at a wide range of temperature covering room temperature.
Yukichi Umakoshi and Shinji Fujimoto
K. Fukamichi et al., "Application of Large Magnetocaloric Effects in Itinerant-Electron Metamagnets to Cooling Systems", Materials Science Forum, Vol. 512, pp. 137-144, 2006