Frequency‐Dependent Conductivities of RbAg4I5 and Na‐β″‐Alumina from Radio to FIR Frequencies

• DOI: 10.1002/bbpc.19910950914
• Publication Date: 2012-07-26T14:47:50Z
• Authors: R. Hoppe; T. Kloidt; K. Funke
• Keywords: 02 engineering and technology; 0210 nano-technology

AbstractThe electric conductivities of the two fast ionic conductors RbAg4I5 and Na‐β″‐alumina have been determined at various temperatures and frequencies from 4 MHz to 105 GHz. – The conductivity of RbAg4I5 is found to display a dispersion as expected by the so‐called “universal dynamic” response, a high‐frequency plateau in the range of 100 GHz and an Arrhenius behaviour at both low and high frequencies. – The spectra of Na‐β″‐alumima show a different behaviour. In addition to the “universal dynamic” response dispersion, a faster and thermally less activated relaxation process is observed at high frequencies and low temperatures. Up to 60 GHz, a high‐frequency plateau has not been encountered.