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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Lithium-Richest Phase of Lithium Tetrelides Li(17)Tt(4) (Tt = Si, Ge, Sn, and Pb) as an Electride
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Lithium-Richest Phase of Lithium Tetrelides Li(17)Tt(4) (Tt = Si, Ge, Sn, and Pb) as an Electride

机译:锂 - 四锂锂锂阶段Li(17)Tt(4)(Tt = Si,Ge,Sn和Pb)作为电极

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摘要

The lithium-richest phase in the binary Li-Tt system (Tt = Si, Ge, Sn, and Pb) has a stoichiometry of Li(17)Tt(4). In the beginning of this paper, the structural complexity of Li(17)Tt(4) is gradually stripped away using the concept of the M26 cluster found in gamma-brass structures and a Tt-centered polyhedral representation. By means of the first-principles electronic structure calculations, which are followed by the analyses of the electron localization function (ELF), Bader charges, and spin density, we observe non-nuclear maxima of the ELF, electron density, and spin density. Since the electron densities off the atoms are confined in crystalline voids, separated from each other, and behaving as an anion, Li(17)Tt(4) can be identified as a potential zero-dimensional electride. This finding agrees with a simple Zintl picture, which suggests a valence electron count of [(Li+)(17)(Tt(4-))(4)center dot e(-)]. Detailed analyses on the band structures, the projected density of states, and crystal orbitals at the Gamma point in the reciprocal space hint at the potential of forming a bond between the non-nuclear electron density and the neighboring atoms. Signatures of bonding and anti-bonding orbital interactions can be witnessed.
机译:二元Li-TT系统(TT = Si,Ge,Sn和Pb)中最富锂的相位具有Li(17)TT(4)的化学计量。在本文的开始,使用伽牛 - 黄铜结构中发现的M26簇的概念和以中心为中心的多面体表示,Li(17)TT(4)的结构复杂性逐渐剥离。借助于第一原理电子结构计算,其次是电子定位功能(ELF),较糟糕的电荷和旋转密度的分析,我们观察ELF,电子密度和旋转密度的非核最大值。由于原子的电子密度局限于晶体空隙中,因此彼此分开,并且表现为阴离子,因此可以将Li(17)Tt(4)识别为潜在的零尺寸电极。这一发现与简单的Zintl图片同意,这表明[(Li +)(17)(TT(4 - ))(4)中心点E( - )]的价电子计数。在往复空间暗示中,在往复空间提示中的沟槽结构,状态的突出密度和晶体轨道的详细分析在非核电子密度和相邻原子之间形成粘合的电位。可以目睹粘接和抗粘合轨道相互作用的签名。

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