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La 1-z Ndz(Fe 0.88 Si 0.12 ) 13 and their hydrides were investigated to obtain large magnetocaloric effects (MCEs) in a wide temperature range, including room temperature, for applications in magnetic refrigents. Since the magnetization change due to the itinerant-electron metamagentic (IEM) transition for La 1-z Ndz(Fe 0.88 Si 0.12 ) 13 becomes larger with increasing z, the isothermal magnetic entropy change ΔSm and the relative cooling power (RCP) are enhanced. In addition, the Curie temperatrue T C of La 0.8 Nd 0.2 (Fe 0.88 Si 0.12 ) 13 is increased from 193 to 319 K by hydrogen absorption, with the IEM transition. The maximum value of -ΔSm, -ΔSm max , in a magnetic field change of 2 T for La 0.8 Nd 0.2 (Fe 0.88 Si 0.12 ) 13 H 1.1 is about 23 J/kg K at T C = 288 K, which is larger than that of 19 J/kg K at T C = 276 K for La(Fe 0.88 Si 0.12 ) 13 H 1.0 . The value of RCP = 179 J/kg of the former is also larger than 160 J/kg of the latter. It is concluded that the partial substitution of Nd improves MCEs in a wide temperautre range, including room temperature.

journal of magnetics

Control of Working Temperature of Isothermal Magnetic Entropy Change in La0.8Nd0.2(Fe0.88Si0.12)13by Hydrogen Absorption for Magnetic Refrigerants