La4(Si5.2Ge2.8O18)(TeO3)4 and La2(Si6O13)(TeO3)2: Intergrowth of the lanthanum(III) tellurite layer with the XO4 (X=Si/Ge) tetrahedral layer

La4(Si5.2Ge2.8O18)(TeO3)4 and La2(Si6O13)(TeO3)2: Intergrowth of the lanthanum(III) tellurite layer with the XO4 (X=Si/Ge) tetrahedral layer
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La4(Si5.2Ge2.8O18)(TeO3)4 和 La2(Si6O13)(TeO3)2:亚碲酸镧 (III) 层与 XO4 (X=Si/Ge) 四面体层的共生

DOI:
10.1016/j.jssc.2007.11.031
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发表时间:
2008-02
影响因子:
3.3
通讯作者:
--
中科院分区:
化学3区
文献类型:
--
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通过固相反应合成了两种新型硅酸镧(III)碲酸盐,即La{sub 4}(Si{sub 5.2}Ge{sub 2.8}O{sub 18})(TeO{sub 3}){sub 4}和La{sub 2}(Si{sub 6}O{sub 13})(TeO{sub 3}){sub 2},并通过单晶X射线确定了它们的结构衍射。 La{sub 4}(Si{sub 5.2}Ge{sub 2.8}O{sub 18})(TeO{sub 3}){sub 4} 的结构具有由 [(Ge{sub 2.82}Si{sub 5.18})O{sub 18}]{sup 4-} 四面体层和 [La{sub 4}(TeO{sub) 组成的三维 (3D) 网络3}){sub 4}]{sup 4+} 层沿 b 轴交替。锗酸盐-硅酸盐层由共享角的 XO{sub 4} (X=Si/Ge) 四面体组成,形成四元环和六元环。 La{sub 2}(Si{sub 6}O{sub 13})(TeO{sub 3}){sub 2}的结构是由沿a轴交替的[Si{sub 6}O{sub 13}]{sup 2-}双层和[La{sub 2}(TeO{sub 3}){sub 2}]{sup 2+}层组成的3D网络。 [Si{sub 6}O{sub 13}]{sup 2-}双层由共享角的硅酸盐四面体构成,形成四元环、五元环和八元环。两种化合物中的TeO{sub 3}{sup 2-}阴离子仅参与与La{sup 3+}离子配位形成亚碲酸镧(III)层。 La{sub 4}(Si{sub 5.2}Ge{sub 2.8}O{sub 18})(TeO{sub 3}){sub 4}是一种宽带隙半导体。 - 图解摘要:第一个镧(III)硅酸盐/锗酸盐亚碲酸盐,即La{sub 4}[(Si{sub x}Ge{sub 8-x})O{sub 18}](TeO{sub 3}){sub 4} (x=5.18)和La{sub 2}(Si{sub 6}O{sub 13})(TeO{sub 3}){sub 2},已被通过单晶X射线衍射合成并确定结构。这两种化合物均具有复杂的 3D 网络结构,由硅酸盐/锗酸盐四面体层与 [LaTeO{sub 3}] 层交替组成。
Two novel lanthanum(III) silicate tellurites, namely, La{sub 4}(Si{sub 5.2}Ge{sub 2.8}O{sub 18})(TeO{sub 3}){sub 4} and La{sub 2}(Si{sub 6}O{sub 13})(TeO{sub 3}){sub 2}, have been synthesized by the solid state reactions and their structures determined by single crystal X-ray diffraction. The structure of La{sub 4}(Si{sub 5.2}Ge{sub 2.8}O{sub 18})(TeO{sub 3}){sub 4} features a three-dimensional (3D) network composed of the [(Ge{sub 2.82}Si{sub 5.18})O{sub 18}]{sup 4-} tetrahedral layers and the [La{sub 4}(TeO{sub 3}){sub 4}]{sup 4+} layers that alternate along the b-axis. The germanate-silicate layer consists of corner-sharing XO{sub 4} (X=Si/Ge) tetrahedra, forming four- and six-member rings. The structure of La{sub 2}(Si{sub 6}O{sub 13})(TeO{sub 3}){sub 2} is a 3D network composed of the [Si{sub 6}O{sub 13}]{sup 2-} double layers and the [La{sub 2}(TeO{sub 3}){sub 2}]{sup 2+} layers that alternate along the a-axis. The [Si{sub 6}O{sub 13}]{sup 2-} double layer is built by corner-sharing silicate tetrahedra, forming four-, five- and eight-member rings. The TeO{sub 3}{sup 2-} anions in both compounds are only involved in the coordination with La{sup 3+} ions to form a lanthanum(III) tellurite layer. La{sub 4}(Si{sub 5.2}Ge{sub 2.8}O{sub 18})(TeO{sub 3}){sub 4} is a wide band-gap semiconductor. - Graphical abstract: The first lanthanum(III) silicate/germanate tellurites, namely, La{sub 4}[(Si{sub x}Ge{sub 8-x})O{sub 18}](TeO{sub 3}){sub 4} (x=5.18) and La{sub 2}(Si{sub 6}O{sub 13})(TeO{sub 3}){sub 2}, have been synthesized and structurally determined by single crystal X-ray diffraction. Both compounds feature complicated 3D network structures composed of the silicate/germanate tetrahedral layers alternating with the [LaTeO{sub 3}] layers.
DOI: 10.1524/zkri.1977.145.16.321
发表时间: 1977
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H. Mayer;G. Pupp
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