Electrical Properties of Molten Agl-Ag_2S Mixtures : Condensed Matter: Electronic Properties, etc.

概要

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The conductivity, σ, of molten (AgI)_<1-c>(Ag_2S)_c mixtures decreases rapidly on the addition of AgI to Ag_2S. The σ of molten Ag_3_SI is 13 ohm^<-1>・cm^<-1> at the melting point. It is suggested that a deep pseudogap is caused by the addition of AgI to Ag_2S. The thermoelectric power, S*, of liquid Ag_2S is -77μV/K at the melting point. The S* of molten (AgI)_<1-c>(Ag_2S)_c mixtures decreases gradually with increasing AgI component and reaches a minimum value of -135 μV/K at the composition c = 0.5. Moreover, the sign of S* on the AgI-rich side changes gradually from negative to positive with increasing AgI composition. This p-n transition was found to occur near the composition c = 0.36. The change in sign of S* may be closely related to a gradual transition from predominantly electronic conduction to ionic one. The behaviour of σ and S* for molten (AgI)_<1-x>(Ag_2S)_c. mixtures was analysed by using a model of conduction processes due to both electrons and silver ions.
社団法人日本物理学会の論文
2000-05-15