On the Nature of Bi in Molten Bi-BiI_3 Mixtures and In in Molten In-InI_3 Mixtures
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概要
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The nature of Bi in moltem Bi-BiI_3 mixtures and In in molten In-InI_3 mixtures is surveyed on the basis of static properties and macroscopic transport coefficient (phase diagram and d. c. conductivity). It is shown that information at the microscopic level due to techniques of pulsed neutron scattering, Raman scattering and NMR can account for their nature. From pulsed neutron scattering data preferred Bi-Bi pair-correlation or polybismuth species is proposed for Bi_xI_<1-x> melts even at the I-rich side below about 40 at% Bi. The localized electronic states around the Fermi level may be established and conduction takes place via hopping of electrons from one trapping site to another for these solutions. The strong concentration-dependence of the first peak distance, which is related to preferred Bi-Bi distance and observed over the range of 0.4<x>0.6, means substantial change of the structural and bonding pattern in polybismuth clusters. Since delocalization of valence electrons concerns the chemical bonding in these clusters consisting of Bi, the continuous MNM transition as well as microscopic inhomogeneity can be observed over the range of 0.4<x>0.6. For In_xI_<1-x> melts there exist two distinct valence-states In^+ and In^<3+>, over the range of 0.25<x>0.5. The existence of two stable ionic-states causes shour-tange orger associated with ionic or unlike configuration and thus these solutions are of conduction-electron deficient insulator.
- 理論物理学刊行会の論文
- 1982-12-20
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関連論文
- On the Nature of Bi in Molten Bi-BiI_3 Mixtures and In in Molten In-InI_3 Mixtures
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