Abstract
The dielectric response of zinc oxide particles to applied electric fields in nitrogen has been observed in a microwave cavity designed for this purpose. With phase-sensitive detection it is estimated that, with these zinc oxide samples, densities of one part in 108 (volume ratio) are detectable. Dielectric saturation and relaxation characteristics are observed with particles several microns in length. It is shown that with measurements of sample concentration, change in cavity Q, dielectric relaxation time, and the ratio of absorption to dispersion, these experiments can yield the length, diameter, and conductivity of the particles. These techniques should be useful for determining the conductivity of micron or submicron crystals or polymer units, for nucleation and crystal growth studies, and for obtaining information on nonspherical aerosol particles.
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