STUDY ON THE BONDING NATURES, STRUCTURES AND DYNAMICAL PROPERTIES IN MOLTEN METAL AND NON-METAL MIXTURES

本研究的目的是了解熔融态材料的结构、动力学行为和电子性质是如何随成键性质而变化的，特别是熔融态的铊-硫族化合物体系是一个很好的例子，因为该体系随着组成的变化，呈现出从金属键到离子键再到共价键的连续变化。在结构研究中，Tl和Tl_2Se的熔融结构基本相同，这表明虽然混合物保持了一定的局部有序性，但Se原子可能被Tl原子取代。但是，从金属化合物Tl_2Se到离子化合物Tl_2Se，电子电导率变化很大。这些关联表明，在金属-非金属过渡区，该体系的交叉电导率变化很大，从Tl_2Se到熔融Se，过渡区的交叉电导率随温度的升高而增大，过渡区的交叉电导率随温度的升高而增大，过渡区的交叉电导率随温度的升高而增大。结构研究表明，该溶液是由Se链和Tl离子部分组成的局域团簇的混合溶液。本文还对卤化亚铜在熔融状态下的结构和磁性进行了研究，发现卤化亚铜中存在部分的共价键，并对卤化亚铜在熔融状态下的磁性进行了测量。特征，并且该特征倾向于在熔融状态下形成四面体构型。

This study was aimed to see how the structures, dynamical behaviours and several electronic properties in molten materials varied incorporating with their bonding natures.In particular, molten thallium-chalcogen system is a very good example to study the above facts, because its system exhibit continuously from the metallic bonding to ionic and finally to covalent bonding with the change of composition. In the structural investigation, the molten structures of Tl to Tl_2Se are nearly the same, which indicates that the Se atoms may be replaced with Tl atoms although the mixtures maintain a kind of local order. However, the electronic conductivity changes drastically on going from metallic to ionic compound Tl_2Se. In connection with this change the mobility of ion increases drastically.These cross correlation may suggest that the cross conductivities in this system are varied largely in the region of metal-non metal transition.From Tl_2Se to molten Se, the structural investigation suggests a kind of mixed solution of local clusters composed of Se chains and ionic part of Tl_2Se.This implies that an amalgamation between the ionic compound and the covalent bonding material was not maintained.The structural studies and measurements of the magnetic susceptibilities for cuprous halides in their molten states were also carried out.These materials involved partly a covalent character and this character tends to from a tetrahedral configuration in the molten state.