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以周期表中各元素与稀土形成的化合物组成与结构为依据,讨论了化合物组成范围与组元X的d、S、SP电子组态的关系、化合物的稳定性及镧系收缩现象。对某一给定化合物类型,化合物单胞体积的立方根与三价稀土离子半径存在着线性关系。由化合物生成时的体积收缩找到化合物稳定性和组元X在周期表中位置的关系,与电子组态的影响一致。总结了铈、铕、镱的价态行为与组元X在周期表中的位置的关系。
Based on the composition and structure of the compounds formed by the elements in the periodic table and the rare earths, the relationship between the compound composition range and the d, s, SP electronic configuration of the element X, the stability of the compound and the lanthanide shrinkage were discussed. For a given compound type, there is a linear relationship between the cubic root of the unit cell volume and the radius of the trivalent rare earth ions. The relationship between the stability of the compound and the position of the component X in the periodic table, as determined by the volume shrinkage at the time of compound formation, is consistent with the effect of the electronic configuration. The relationship between the valence behavior of cerium, europium and ytterbium and the position of element X in the periodic table is summarized.