Indexed on: 01 May '03Published on: 01 May '03Published in: Glass Physics and Chemistry
The temperature–concentration dependence of the electrical conductivity of glasses in the Li2O–LiPO3 and Li2S–LiPO3 systems is investigated. With the use of the Tubandt method, it is demonstrated that the electric current in glasses of these systems is provided by migration of lithium ions. The concentration dependence of the electrical conductivity is interpreted using the obtained data on the IR absorption spectra, density, microhardness, ultrasonic velocity, etc. It is found that the electrical conductivity of glasses in the Li2S–LiPO3 system is more than 103 times higher than that in pure LiPO3. The observed increase in the electrical conductivity is explained by the formation of sulfur-containing polar structural–chemical groupings of the Li+[S–PO3/2] type, whose dissociation energy is lower than that of similar oxide polar structural fragments. This results in an increase in the number of lithium ions involved in the electricity transport due to an increase in the degree of dissociation of polar structural–chemical units.