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

本研究旨在了解熔融材料的结构、动力学行为和几种电子性质随其成键性质的变化，特别是熔融Tl-硫系就是研究上述事实的一个很好的例子，因为它的体系随着组成的变化不断地表现出从金属键到离子键再到共价键的过程。在结构研究中，Tl和Tl2Se的熔体结构基本相同，这表明尽管混合物保持了一种局域有序，但Se原子可能被Tl原子取代。而从金属化合物Tl_2Se到离子化合物Tl_2Se，电子电导率变化很大。与此相对应，离子的迁移率急剧增加。这种相互关联可能表明，该体系的交叉电导在金属-非金属过渡区变化很大。从Tl_2Se到熔融Se，结构研究表明，一种由Se链和Tl_2Se的离子部分组成的局部团簇的混合溶液。这意味着离子化合物和共价键材料之间没有保持融合。还对卤化亚铜在熔融状态下的结构和磁化率进行了研究和测量。这些材料部分涉及共价性质，这一特征在熔融状态下倾向于四面体构型。

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.