Abstract
La(Fe x Si 1− x ) 13 exhibit an itinerant-electron metamagnetic (IEM) transition at relatively low applied magnetic fields just above the Curie temperature T C. Large magnetocaloric effects (MCEs) in terms of the isothermal temperature change Δ S m and the adiabatic temperature change Δ T ad are followed by the IEM transition. The MCEs increase, while T C decreases with increasing Fe concentration. Therefore, T C of these compounds should be controlled up to room temperature from the viewpoint of practical applications. The working temperature as magnetic refrigerants is extended from about 185 to 330 K by adjusting hydrogen concentration. After hydrogen absorption, the MCEs as well as the thermal conductivity of La(Fe x Si 1− x ) 13 and their hydrides exhibit excellent characteristics in the temperature range mentioned above. Consequently, the present compounds are one of the promising candidates for magnetic refrigerants working in a wide temperature range covering room temperature.
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