定性地说明了在金属间化合物La0.8Ce0.2Fe11.4Si1.6中用少量Ce代替La,可以增加合金体系ac/b^2的值和临界磁场Bc(T),降低合金体系顺磁态和铁磁态间的能垒,增强IEMT特性,并使该化合物在居里温度处低磁场下的磁化系数发生了剧烈的变化。上述原因使化合物La0.8Ce0.2Fe11.4Si1.6在居里温度附近获得了巨大的等温磁熵变。此化合物在1T的低磁场下居里温度Tc~186K附近的最大等温磁熵变为74.79J(kg·K)。
The substitution of Ce for part of La in La0.8Ce0.2Fe11.4Si1.6 increases the ratio of Landau coefficients (a(T)c(T)/b(T)^2) and the critical field Be(T), reduces the energy bar between ferromagnetic state and paramagnetic state, enhances the property of IEM, and leads to a sharp change of susceptibility in the vicinity of the curie temperature, which induces giant values of the isothermal magnetic entropy change ASM around the curie temperature Tc-186K in the compound. And the maximum value |△SM|max-74.79J(kg·K) under a field change of 0-1T.