The dielectric constant of zinc oxide over a range of frequencies

Abstract

The dielectric constant of a colloidal zinc oxide has been measured by the method of mixtures, using cyclohexanol and ethyl acetate as the suspending liquids. The dielectric constant has been found to be 10.4 over the frequency range 105 kc/s to 10 Mc/s, falling to 9.4 at 25 Mc/s, measurements being made at 25° C with an accuracy of 2.3%. The dielectric constant of an acicular zinc oxide has been found to have an apparent value of about 40, over the frequency range 100 kc/s to 10 Mc/s. Results are given of dielectric constant measurements on mixtures of cyclohexanol and ethyl acetate, which appear to disobey Lichteneker's empirical logarithmic mixing rule.