Abstract

Single crystals of novel rare earth–cadmium tellurite halides, [Ln₁₂(TeO₃)₁₂][Cd₆X₂₄] (Ln = La, X = Cl (1); Ln = La, X= Br (2), and Ln = Pr, X = Br (3)), were obtained from melts. All three compounds are isostructural to layered tellurite halides [Ln₁₂(TeO₃)₁₂][Cd₆Cl₂₄] (Ln = Sm, Eu), described earlier, and crystallize in space group P4/nbm with unit cell parameters a ~ 16 Å and c ~ 13 Å. Their crystal structures have been refined to R_obs = 0.052, 0.047, and 0.049, respectively. Bromides adopting this structure have been synthesized for the first time. Crystal-chemical features and prospects for development are discussed for the family of rare earth chalcogenite halides containing [Ln₁₁M_x(ChO₃)₁₂] rare earth–chalcogenite slabs.

中文翻译：

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新型稀土碲化镉镉的合成与结构

摘要

新型稀土-碲化镉碲化物[Ln ₁₂（TeO ₃）₁₂ ] [Cd ₆ X ₂₄ ]（Ln = La，X = Cl（1）; Ln = La，X = Br（2）和从熔体获得Ln ＝ Pr，X ＝ Br（3））。所有三种化合物是同构的层状碲酸盐卤化物[LN ₁₂（的TeO ₃）₁₂ ] [镉₆氯₂₄ ]（LN =钐，铕），前面描述的，并且在空间群结晶P 4 / NBM晶胞参数一〜 16Å和c〜13Å。它们的晶体结构已分别精炼到R _obs = 0.052、0.047和0.049。采用这种结构的溴化物是首次合成。讨论了含[Ln ₁₁ M _x（ChO ₃）₁₂ ]稀土-硫属矿物板的稀土硫属卤化物家族的晶体化学特征和发展前景。