Further study of high field dielectric effects in H2O, D2O and ionic solutions

High field dielectric measurements of the Piekara factor ΔIµ/E2 have been carried out for H2O and D2O at 293 K and as a function of temperature, and also in the case of H2O in the presence of small amounts of added electrolyte (KCl). The value of (–ΔIµ/E2) at 293 K for both H2O and D2O was found to be (0.8 ± 0.12)× 10–15 m2 V–2. (–ΔIµ/E2) for both H2O and D2O was found to follow a 1/T3 temperature dependence. Both sets of data indicate agreement between the measured values and the predicted values on the basis of the classical orientational dipolar non-linear effect. The data for the ionic solutions were found to be as expected for low conductivities, but for conductivities above about 5 × 10–4 S m–1 the occurrence of significant heat losses during the pulse and/or electrode polarisation effects is indicated.