Abstract
A range of sodium tetraborate glasses containing lead oxide and copper oxide was prepared. Measurements of the DC conductivity as a function of composition and temperature were made. It was found that the replacement of Pb
3
O
4
by CuO decreased the activation energy linearly with the CuO content of the glasses. 1-V measurements showed an ohmic behaviour with some deviation at high electric field in the temperature range 335-555K for Na
2
B
4
O
7
-Pb
3
0
4
glass sample. Na
2
B
4
0
7
-Pb
3
O
4
-CuO glass samples showed an ohmic behaviour over the same range of measurements.