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首页> 外文期刊>Journal of synchrotron radiation >Local structures of (Ge_4/Si_4)_5 monolayer strained-layer supperlattice probed by fluorescence XAFS
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Local structures of (Ge_4/Si_4)_5 monolayer strained-layer supperlattice probed by fluorescence XAFS

机译:荧光XAFS探测(Ge_4 / Si_4)_5单层应变层超晶格的局部结构

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摘要

Local structures of (Ge_4/Si_4)_5 monolayer stained-layer supperlattice (MSLS) have been studied by fluorescence XAFS. The distortion of local lattice around Ge atoms is evidenced by the compressed Ge-Ge and Ge-Si bond lengths, R_(Ge-Ge) (0.243 nm)and R_(Ge-Si) (0.238 nm) in (Ge_4/Si_4)_5 MSLS are 0.002 nm shorter than those of c-Ge (R_(Ge-Ge)=0.245 nm) and the sum of covalent radii (R_(Ge-Si)=0.240 nm), respectively, The determined Si coordination number (2.2) is slightly larger than the Ge coordination number (1.8). A simple mechanism of site-exchange between particular sites and theadjacent several layers is proposed to interpret the interface structure for the (Ge_4/Si_4)_5 MSLS.
机译:通过荧光XAFS研究了(Ge_4 / Si_4)_5单层染色层超晶格(MSLS)的局部结构。 Ge原子周围的局部晶格畸变由(Ge_4 / Si_4)中压缩的Ge-Ge和Ge-Si键长,R_(Ge-Ge)(0.243 nm)和R_(Ge-Si)(0.238 nm)证明。 _5 MSLS分别比c-Ge(R_(Ge-Ge)= 0.245 nm)和共价半径之和(R_(Ge-Si)= 0.240 nm)短0.002 nm,确定的Si配位数(2.2 )略大于Ge配位数(1.8)。提出了一种在特定站点和相邻几层之间进行站点交换的简单机制,以解释(Ge_4 / Si_4)_5 MSLS的接口结构。

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