The D-C conductivity of barium titanate

The conductivity σ is given by σ =exp(-W/RT) (ohm.cm)^-1, where T is the absolute temperature, R the gas constant and W the activation energy in calories per mole. (There is also a second term of the same form which was not prominent in the present measurements.) It is shown that the activation energy for conduction in barium titanate ceramics containing lead or lithium is about 18.4 kcal/mole (0.8 electron volts), and that this is either equal to or not very different from the activation energy for conduction in the single crystal.