首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Single-crystal structure and solid-state NMR of ga2-xsc xo3 (x = 0.83)
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Single-crystal structure and solid-state NMR of ga2-xsc xo3 (x = 0.83)

机译:ga2-xsc xo3(x = 0.83)的单晶结构和固态NMR

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摘要

Colorless needles of Ga_(2-x)Sc_xO_3 (x = 0.83) were isolated during the crystal growth of La_3Ga3_Sc _2O_(12) in a K_2WO_4 flux. The structure was refined from X-ray single-crystal data: β-Ga_2O_3 type,C2/m, Z = 4, a = 12.716(4), b = 3.1566(6), c = 5.928(5) ? β = 102.57(3)?V = 232.2 ?A~3, wR2 = 0.0618, 429 F~2 values, 32 variables. The structure is based on infinite double chains of edge-sharing Sc/GaO_6 octahedra running along the b axis. The GaO _4 tetrahedra connect these chains by sharing corners and form a three-dimensional framework. The oxygen atoms form a distorted ccp pattern. The ~(45)Sc NMR spectra confirm the presence of a single scandium site, while ~(71)Ga NMR data clearly prove the partial occupancy of the scandium site by gallium atoms. The nuclear electric quadrupolar parameters of ~(45)Sc and ~(71)Ga are discussed in relation to the crystallographic atomic environments.
机译:在K_2WO_4助熔剂中La_3Ga3_Sc _2O_(12)的晶体生长过程中,分离出无色的Ga_(2-x)Sc_xO_3(x = 0.83)针。从X射线单晶数据细化结构:β-Ga_2O_3型,C 2 /m,Z=4,a=12.716(4),b=3.1566(6),c=5.928(5)? β= 102.57(3)?V = 232.2?A〜3,wR2 = 0.0618,429 F〜2值,32个变量。该结构基于沿b轴延伸的边缘共享Sc / GaO_6八面体的无限双链。 GaO_4四面体通过共享角连接这些链,并形成三维框架。氧原子形成扭曲的ccp模式。 〜(45)Sc NMR光谱证实存在单个scan位点,而〜(71)Ga NMR数据清楚地证明镓原子对the位点的部分占有。讨论了〜(45)Sc和〜(71)Ga的核四极电参数与晶体学原子环境的关系。

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