首页> 外文期刊>Journal of chemical crystallography >Hydrothermal synthesis and single crystal structures of new thorium fluorides: A _3Ba _2Th _3F _(19) (A = Na, K, Rb)
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Hydrothermal synthesis and single crystal structures of new thorium fluorides: A _3Ba _2Th _3F _(19) (A = Na, K, Rb)

机译:新氟化s的水热合成和单晶结构:A _3Ba _2Th _3F _(19)(A = Na,K,Rb)

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摘要

A new family of mixed alkali-alkaline earth metal thorium fluorides based on the formulation A _3Ba _2Th _3F _(19) (A = Na, K, Rb) has been synthesized and structurally characterized. The compounds crystallize in the cubic space group Im-3m with a = 12.1222 (14) and 12.3052 (14) ? for the K and Rb end members, respectively. This is only the second thorium fluoride reported as a single crystal structure to incorporate alkali and alkaline earth metals into the same structure. Crystals were obtained from the equimolar reaction of Ba(OH) _2·H _2O, ThF _4 and ABF _4 in a 2 M AF solution under hydrothermal conditions (545 °C and 1 kbar). Barium atoms substitute at the alkali metal sites and preferential site substitution is supported by the crystallographic analysis. Additional substitution at the alkali metal site has also been shown for K _(2·2)Na _(0·8)Ba _2Th _3F _(19) and K _(1·85)Rb _(1·15)Ba _2Th _3F _(19) using dissimilar alkali tetrafluoroborate and fluoride mineralizers in the reaction.
机译:合成了一个新的混合碱-碱土金属氟化s族,其配方为A _3Ba _2Th _3F _(19)(A = Na,K,Rb),并对其结构进行了表征。该化合物在立方空间群Im-3m中结晶,其a = 12.1222(14)和12.3052(14)?分别用于K和Rb末端成员。这只是第二个氟化a以单晶结构报道,将碱金属和碱土金属掺入同一结构中。在水热条件下(545°C和1 kbar),在2 M AF溶液中,Ba(OH)_2·H _2O,ThF _4和ABF _4的等摩尔反应获得了晶体。钡原子在碱金属位点取代,并且通过晶体学分析支持优先位取代。还显示了在碱金属位点上的其他取代为K _(2·2)Na _(0·8)Ba _2Th _3F _(19)和K _(1·85)Rb _(1·15)Ba _2Th _3F _(19)使用不同的碱金属四氟硼酸盐与氟化物矿化剂反应。

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