Abstract
Measurements of d.c. electrical conductivity were made on 65TeO2-(35 -x)CuO-xLu2O3 (mol%) glasses with x=0, 1, 2, 3, 4. The experimental results show that whenx is changed from 1 to 2 mol%, the conductivity increases due to the additional electrons obtained by the oxidation of TeO2 as well as due to the Cu+ → Cu2+ transition under the effect of interelectronic repulsion in the 4f shell of the lutetium present in the glass. Whenx is increased to greater than 2 mol%, the conductivity decreases because hopping is inhibited due to the formation of oxygen bridge associates or because of the strong ligand repulsive field of lutetium indicating its non-reactivity in the glassy network. The conductivity has a distinct maximum atx=2.
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Malik, M.S., Hogarth, C.A. Chemical approach to the conduction mechanism in copper tellurite glasses containing lutetium oxide. J Mater Sci 25, 1913–1916 (1990). https://doi.org/10.1007/BF01045742
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DOI: https://doi.org/10.1007/BF01045742