LF, HF, and microwave techniques for studying superionic conductors

Automated equipment was developed for determining the admittance of solid electrolytes over the frequency range from 10 to 10/sup 11/ Hz. A four-electrode technique was used at audio- and low radio-frequencies up to 10/sup 6/ Hz. At wavelengths in the meter and centimeter band, coaxial lines were used to determine the complex reflection coefficients. At wavelengths in the millimeter band, complex reflection coefficients were measured by determining the field strengths in a few points of the standing wave. The methods developed were used to determine the admittance and dielectric permittivities of solid electrolytes: Na/sub 2/O x 10Al/sub 2/O/sub 3/, Na/sub 3/Fe/sub 2/(PO/sub 4/)/sub 3/, and Ag/sub 4/RbI/sub 5/.