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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Distribution of the M-M distances in the rare earth oxides
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Distribution of the M-M distances in the rare earth oxides

机译：稀土氧化物中M-M距离的分布

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摘要

A systematic study of the distribution of the M-M distances in all the binary, ternary and quaternary oxides of the rare earth elements (RE = Sc, Y, La-Lu), contained in the Inorganic Crystal Structure Database (ICSD) has been carried out. The results indicate that the RE-RE distances are not distributed uniformly, but present maxima which are close to the corresponding distances in the pure metals. In some of the histograms (Y, Ce, Pr, Sm, Tb, Dy, Ho, Lu) two maxima appear which correspond to the nearest-neighbor (b.c.c., h.c.p.) and second-nearest neighbor (b.c.c.) distances of the elemental phases. As examples of this behavior, the cation arrays of the binary oxides, hydroxides and ternary oxides of both the delafossite and alpha-NaFeO2 type are analyzed. In all of them the cations form aggregates whose topologies and distances can be related to the structure of the parent metals. The size of the metal aggregates seems to decrease with increasing oxygen content. [References: 48]
机译：对无机晶体结构数据库（ICSD）中包含的稀土元素（RE = Sc，Y，La-Lu）的所有二元，三元和四元氧化物中MM距离的分布进行了系统的研究。结果表明，RE-RE距离不是均匀分布，而是呈现出最大值，接近于纯金属中的相应距离。在某些直方图中（Y，Ce，Pr，Sm，Tb，Dy，Ho，Lu），出现两个最大值，分别对应于元素相的最近邻（bcc，hcp）和第二近邻（bcc）距离。作为该行为的示例，分析了铜铁矿和α-NaFeO2型二元氧化物，氢氧化物和三元氧化物的阳离子阵列。在所有这些阳离子中，阳离子形成聚集体，其拓扑结构和距离可能与母体金属的结构有关。金属聚集体的尺寸似乎随着氧含量的增加而减小。 [参考：48]

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