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Atomic Structure and Sound Wave in Liguid Alloys incorporating with Metal-Nonmetal Transition

金属-非金属转变液态合金中的原子结构和声波

基本信息

批准号：
60460030
负责人：
TAMAKI Shigeru
金额：
$ 4.93万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60460030/
关键词：
Phase transition in Liquid Alloys Sound Wave in Liquid Alloys Specific Heat of Liquid Schotty-type Specific Heat 液体の構造相転移金属-非金属転移液体の構造液体の音速と吸收液体の比熱 So-Teの性質液体Te化合物の物性

项目摘要

A large temerature dependence of the electronic properties, heats and structure factors in liquid tellurium and their alloys has been observed. These anomalies are due to the transition from non-metallic to metallic state incorporating to the recombination of bonding in the system. The large specific heats in liquid Se-Te and IIIb-Te alloys are fully explained in terms of Schottky-sype specific heat based on a gradual transition. Using this thermodynamic data, the structure factors of these systems can be analysed in the atomic scale. In particular, the temperature dependence of measured structural functions of liquid Se-Te alloys could be explained by a gradual transition from two-fold coordinate component (non-metallic) to the three-fold one (metallic)The compressibilities obtained from the sound velocity for these system show a large excess value which is expressed by a kind of lorezian curve. We also found that this excess value is phenomenologically propotional to a product of volume difference (V_M-V_N) between metallic and nonmetallic state and the differentiation of the metallic fraction with the pressure. The ration of the dulk viscosity and the shear viscosity of these system also shows a minimum at the transition temperatureIn conclusion this kind of transition is classified a higher order transition.

在液态碲及其合金中观察到了电子性质、热和结构因子的温度依赖性。这些反常现象是由于体系中非金属态向金属态的转变以及成键的重组所致。本文用Schottky型相变比热充分解释了液态Se-Te和IIIb-Te合金的大比热。利用这些热力学数据，可以在原子尺度上分析这些系统的结构因子。特别地，液态Se-Te合金的结构函数的温度依赖性可以用从二次坐标分量（非金属）到三次坐标分量（金属）的逐渐过渡来解释。由声速得到的压缩系数显示出一个很大的过剩值，用一种Lorezian曲线来表示。我们还发现，这个过量值与金属态和非金属态的体积差（V_M-V_N）和金属分数对压力的微分的乘积成正比。在转变温度处，体系的粘滞系数与剪切系数之比也有一个极小值，因此，这种转变属于一种高阶转变。