Abstract
Glasses in the system CaO–SiO2 were prepared with the composition varying from 40 to 55 mole % CaO. The Na2O impurity content ranged from 0.01 to 1.30 mole %. The electrical resistivity was insensitive to the Na2O content but decreased with increasing CaO concentration. The activation energy for conduction ranged from 33.54 to 31.23 kcal/mole as the CaO concentration increased. The conduction mechanism was considered in terms of three arbitrary parameters: (1) equivalent oxygen packing density, (2) ionic radius, and (3) ion‐oxygen attraction.
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