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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Short and long bonds in liquid tellurium
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Short and long bonds in liquid tellurium

机译：液态碲中的短键和长键

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摘要

Liquid tellurium (Te) is metallic, which is caused by the strong interaction between neighbouring chain-molecules. With decreasing temperature from the melting point (approx 450 deg C) to a supercooled state (approx 250 deg C), liquid Te undergoes a transition from a metal to a semiconductor (M-S transition) being accompanied by volume expansion. Our EXAFS data for supercooled liquid Te were carefully analyzed by adopting a 'model-independent' method. It is found that the short chains in liquid Te with metallic nature are composed of short (approx 2.80 A) and long(approx 2.95 A) covalent bonds and that the long bonds vanish on the M-S transition. The M-S transition described above also occurs by the addition of an alkali to liquid Te. The relation of the existence of long covalent bond and the metallic behavior is explained in term of charge fluctuations in the chain molecule.
机译：液态碲（Te）是金属的，这是由相邻链分子之间的强相互作用引起的。随着温度从熔点（大约450摄氏度）降低到过冷状态（大约250摄氏度），液体Te经历了从金属到半导体的转变（M-S转变），并伴随着体积膨胀。我们采用“模型无关”方法仔细分析了我们的过冷液体Te的EXAFS数据。发现具有金属性质的液体Te中的短链由短的（约2.80 A）和长的（约2.95 A）共价键组成，并且长键在M-S跃迁上消失。上述的M-S转变也通过向液体Te中添加碱而发生。长链共价键的存在与金属行为的关系用链分子中的电荷波动来解释。

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