Experimental results on the temperature dependence of the internal voltage in aluminum/(alumina) ‐barium‐stearate/tin sandwich structure have been described in the temperature range 50–0 °C. It is observed that the internal voltage, which arises from the asymmetric nature of the electrodes and due to the dipole field in the alumina film, decreases with decrease of temperature. The observed temperature dependence of the internal voltage has been attributed mainly to the thermal excitation of impurities in the insulating alumina film.