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NaZn13型La(Fe,Si)13化合物随Si含量增加,相变性质由一级过渡为二级,化合物晶胞体积收缩,饱和磁化强度降低,居里温度升高.其居里温度与晶胞体积之间的关系不能用Bethe-Slater曲线给出合理的解释.本文利用添加间隙原子碳调节La(Fe,Si)13化合物晶胞体积和居里温度的方法,系统研究了该化合物居里温度与晶胞体积之间的关系.结果发现二者之间的变化规律遵循Jaccarino-Walker模型,即仅有5%甚至更少的3d电子被认为是真正的巡游电子,其余的3d电子仍是局域的.以极化的巡游电子为媒介,局域电子之间产生类似于Ruderman-Kittel-Kasuya-Yosida的长程相互作用,相互作用的符号和大小与距离呈周期性震荡.随Si含量的增加,La(Fe,Si)13化合物巡游电子数目增加,化合物的居里温度由晶胞体积和巡游电子的浓度共同决定.
With the increase of Si content, the phase transition properties of the NaZn13 La (Fe, Si) 13 compound change from first order to second order, the unit cell volume shrinks, the saturation magnetization decreases and the Curie temperature increases, The relationship between volume and volume can not be explained by Bethe-Slater curve.In this paper, the cell volume and Curie temperature of La (Fe, Si) 13 compound were adjusted by adding interstitial carbon atoms, the Curie temperature And the cell volume.The results show that the variation between them follows the Jaccarino-Walker model, that is, only 5% or less of the 3d electrons are considered as true cruising electrons and the remaining 3d electrons are still Domain.With polarimetric cruising electrons as a medium, long-range interactions between local electrons similar to Ruderman-Kittel-Kasuya-Yosida are generated, and the sign and the size of the interaction and the distance are cyclical oscillations.With the increase of Si content , La (Fe, Si) 13 compounds increased the number of cruise electrons. The Curie temperature of the compounds was determined by the combination of cell volume and cruising electron concentration.