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Glasses have been made in the systems normalBaO‐V2O5‐P2O5 and Na2O‐normalBaO‐V2O5‐P2O5 with V2O5 contents ranging between 50 and 87 mole%. The glasses were found to be semiconductors, those with the highest V2O5 contents having a specific conductivity of the order of 10−5 ohm−1 cm−1 at room temperature. The relationship between the specific conductivity, σ, and the temperature was determined, and it was found that the slope of the logσ—1/T plots was equivalent to an activation energy in the range 0.35–0.40 ev for all the glasses. The value of logσ normalat 25°C plotted against the mole percent V2O5 gave a straight line relationship for each series of glasses. Conductivity values obtained could be easily reproduced and were not sensitive to variations in melting conditions.

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