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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ba _2AgInS _4 and Ba _4MGa _5Se _(12) (M = Ag, Li): Syntheses, structures, and optical properties
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Ba _2AgInS _4 and Ba _4MGa _5Se _(12) (M = Ag, Li): Syntheses, structures, and optical properties

机译:Ba _2AgInS _4和Ba _4MGa _5Se _(12)(M = Ag,Li):合成,结构和光学性质

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摘要

The first two members in alkaline-earth/group XI/group XIII/chalcogen system, namely Ba _2AgInS _4 and Ba _4AgGa _5Se _(12), were synthesized along with a Li analogue Ba _4LiGa _5Se _(12). Ba _2AgInS _4 crystallizes in space group P2 _1/c. It contains 2~∞[AgInS _4] ~(4-) layers built from AgS _3 triangles and InS _4 tetrahedra with Ba ~(2+) cations inserted between the layers. Ba _4AgGa _5Se _(12) and Ba _4LiGa _5Se _(12) adopt two closely-related structure types in space group P42 _1c with structural difference originating from the different positions of Ag and Li in them. The three-dimensional framework in Ba _4AgGa _5Se _(12) is composed of GaSe _4 tetrahedra with the Ba and Ag atoms occupying the large and small channels respectively, whereas that in Ba _4LiGa _5Se _(12) is built from LiSe _4 and GaSe _4 tetrahedra with channels to accommodate the Ba atoms. As deduced from the diffuse reflectance spectra measurement, the optical band gaps were 2.32 (2) eV, 2.52 (2) eV, and 2.65 (2) eV for Ba _2AgInS _4, Ba _4AgGa _5Se _(12), and Ba _4LiGa _5Se _(12), respectively
机译:与碱类似物Ba _4LiGa _5Se _(12)一起合成了碱土/ XI族/ XIII /硫族元素体系中的前两个成员Ba _2AgInS _4和Ba _4AgGa _5Se _(12)。 Ba _2AgInS _4在空间群P2 _1 / c中结晶。它包含由AgS _3三角形和InS _4四面体构成的2〜∞[AgInS _4]〜(4-)层,层之间插入Ba〜(2+)阳离子。 Ba _4AgGa _5Se _(12)和Ba _4LiGa _5Se _(12)在空间群P42 _1c中采用两种密切相关的结构类型,其结构差异源自Ag和Li在其中的不同位置。 Ba _4AgGa _5Se _(12)中的三维框架由GaSe _4四面体组成,其中Ba和Ag原子分别占据大通道和小通道,而Ba _4LiGa _5Se _(12)中的三维框架是由LiSe _4和GaSe构建的_4四面体具有容纳Ba原子的通道。从漫反射光谱测量得出,Ba _2AgInS _4,Ba _4AgGa _5Se _(12)和Ba _4LiGa _5Se _的光学带隙分别为2.32(2)eV,2.52(2)eV和2.65(2)eV。 (12)分别

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