Role of PbO in lithium ion transport in Li2O-PbO-B2O3 glasses

A wide range of compositions of grasses in the ternary Li2O-PbO-B2O3 glass system was prepared, and de and ac conductivity measurements were carried o ut on these glasses. The presence of lead leads to a decrease in de conduct ivities and an increase in the activation energies. This is likely to be du e to the increase of the partial charges on the oxygen atoms and to the pre sence of the lone pair on the Pb atom; both of these factors impede lithium ion motion. The ac conductivity and dielectric behavior of these glasses s upport such a conjecture. (C) 2000 Elsevier Science Ltd.