K8(K5F)U6Si8O40: An Intergrowth Uranyl Silicate

Single crystals of K8(K5F)­U6Si8O40 were grown from a mixed alkali halide flux. K8(K5F)­U6Si8O40 is the first intergrowth uranyl silicate, being composed of alternating slabs related to two previously reported uranyl silicates: Cs2USiO6 and [Na9F2]­[(UO2)­(UO2)2(Si2O7)2]. It exhibits intense luminescence, which is influenced by the [(UO2)2O] dimers present in the structure.采用混合碱金属卤化物熔剂（mixed alkali halide flux）法生长得到K₈(K₅F)‑U₆Si₈O₄₀单晶体。K₈(K₅F)‑U₆Si₈O₄₀是首例互生长型铀酰硅酸盐（uranyl silicate），其结构由两种已有报道的铀酰硅酸盐——Cs₂USiO₆与[Na₉F₂]‑[(UO₂)‑(UO₂)₂(Si₂O₇)₂]——对应的结构片层交替排布构成。该化合物展现出强烈的发光特性，其发光行为受结构中存在的[(UO₂)₂O]二聚体调控。