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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >A new ternary silicide GdFe1?xSi2 (x=0.32): preparation, crystal and electronic structure
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A new ternary silicide GdFe1?xSi2 (x=0.32): preparation, crystal and electronic structure

机译:新的三元硅化物GDFE1?XSI2(x = 0.32):制备,晶体和电子结构

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摘要

The title compound was prepared from the elements by arc-melting. The crystal structure was investigated by means of single-crystal X-ray diffraction. It crystallizes in the TbFeSi2 structure type, orthorhombic space group Cmmm, a?=?4.0496(8), b?=?16.416(2), c?=?3.9527(6) ?, Z?=?4, R1?=?0.041, wR2?=?0.11 for 207 unique reflections with Io?>?2 σ(Io) and 19 refined parameters. The Fe position is not fully occupied and the refinement results in a composition GdFe0.68Si2 in agreement with a chemical analysis. The structure consists of zig-zag chains of Si(1) atoms which are terminally bound to additional Si(2) atoms. For an ordered variant GdFe0.5Si2 the Zintl concept can be applied which results in formal oxidation states Gd3+(Fe2+)0.5Si(1)1?Si(2)3?. The electronic structure of this variant GdFe0.5Si2 was analyzed using the tight-binding LMTO method and the results confirm the simple bonding picture.
机译:通过熔融由元素制备标题化合物。 通过单晶X射线衍射研究晶体结构。 它在TBFESI2结构型,正交空间组CMMM中结晶,a?= 4.0496(8),B?=α16.416(2),C?= 3.9527(6)?,z?=?4,R1?= ?0.041,WR2?= 0.11,对于207个独特的IO唯一反射,有IO?>?2σ(IO)和19个精制参数。 Fe位置未完全占用,细化结果与化学分析一致的成分GDFE0.68SI2。 该结构由Si(1)原子的Zig-Zag链组成,其是终端结合到另外的Si(2)原子。 对于有序变量GDFE0.5SI2,可以应用ZINTL概念,其导致正式氧化状态GD3 +(FE2 +)0.5SI(1)1?Si(2)3?。 使用紧密结合的LMTO方法分析该变体GDFE0.5SI2的电子结构,结果证实了简单的粘接图像。

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