Abstract
The electrical conductivity, σ , and the thermoelectric power, S , have been measured for molten CuCl-Cu2 Se mixtures as a function of composition and temperature. The electrical conductivity of their mixtures decreases rapidly with the addition of CuCl to liquid Cu2 Se. The thermoelectric power of molten CuCl-Cu2 Se mixtures shows a steady increase with increasing the composition of CuCl. The experimental results suggest that the dominant transport process in the molten CuCl-Cu2 Se mixtures changes from electronic to ionic conduction. The composition dependence of σ and S was analyzed by using the fundamental equation of electrical current densities due to the electrons and the ions. According to this analysis, the conductivity gap increases gradually on the addition of CuCl to liquid Cu2 Se and the conductivity gap is about 0.68 eV for molten (CuCl)0.3 (Cu2 Se)0.7 mixture.
Highlights
A decade ago Hamilton et al 1 have determined the structure of liquid Cu2Se by neutron diffraction with isotopic substitution
Electrical conductivity and thermoelectric power measurements were made on molten CuCl-Cu2Se mixtures simultaneously using a quartz cell system as described previously 7
The value of for liquid Cu2Se reported in refs. 9, 10, 2 and 3 is 117, 131, 158 and 162 -1 cm-1 at the melting point, respectively [2,3,9,10]
Summary
A decade ago Hamilton et al 1 have determined the structure of liquid Cu2Se by neutron diffraction with isotopic substitution. They have indicated that the structure of liquid Cu2Se is characterized as an ionic melt consisting of the disordered Cu+ ions and a more ordered Se2- sub-structure. Liquid Cu2Se has a significant electronic conductivity of about 158 -1 cm-1 that originates from the small energy gap 2. This electronic conductivity dominates the relative small contribution of the ionic conductivity of about 7 -1 cm-1 to the total conductivity 3. At sufficiently high halide compositions the electronic conduction becomes comparable and less than the ionic conduction so that the mixture begins to show electrical properties more typical of a normal molten salt
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