Ultrasonic attenuation studies of solid electrolytes

Oxygen Ion Conductors

“…An associated pair can act as both an electric and elastic dipole and the relevant theory has been discussed by Nowick (6). A variety of techniques have been used to probe an elastic and dielectric relaxations and the reader should consult the relevant literature (6,19,20) for further information on these in vestigations including ultrasonic attenuation, and ionic thermocurrent techniques which can provide additional information about the details of the ionic transport mechanism.…”

Analysis of acoustic attenuation spectra due to ion transport processes in glassy electrolytes

“…In fact all the investigated relaxation peaks are much broader than Debye peak that can be interpreted as arising from the existence of a distribution of relaxation times due to random deviations in the local arrangement of the system. According to this hypothesis when the relaxation losses are not too large one can write for the acoustic attenuation a distribution f(τ) of relaxation times [3]. As a consequence, the τ distribution can be connected with a distribution of activation energies f(E), representing the heights of the barriers that the ions must surmount to go into the near allowed positions.…”

“…However, in solid electrolytes the mobile ion concentrations are large and conduction mechanisms are thought to be cooperative. The relaxation phenomena observed in a wide variety of materials exhibit a double power-law type of frequency dependence, the relationship to Debye behaviour can be then expressed in the form [3] where m and n are power-law exponents, which take values between 0 and 1. When m = 1 and n = 1, equation (1) reduces to the equation for a single Debye-like process.…”

“…Acoustical measurements made over a wide range of frequencies and temperatures can characterize different relaxation processes according to corresponding transport mechanisms due to a strong acoustoionic interaction [1][2][3]. In glassy electrolytes, the mobile ions encounter different kinds of sites so that ionic hopping motion and relaxation processes connected with charge mobility can be obviously explained by modified jump relaxation model and suitable response function for transport mechanisms and relaxation processes description, respectively [3,4].…”

“…Acoustical measurements made over a wide range of frequencies and temperatures can characterize different relaxation processes according to corresponding transport mechanisms due to a strong acoustoionic interaction [1][2][3]. In glassy electrolytes, the mobile ions encounter different kinds of sites so that ionic hopping motion and relaxation processes connected with charge mobility can be obviously explained by modified jump relaxation model and suitable response function for transport mechanisms and relaxation processes description, respectively [3,4].In this contribution we present experimental results obtained by acoustic investigation of the set of glasses prepared in the system CuI-CuBr-Cu 2 O-P 2 O 5 and their theoretical description with the purpose to study ion transport mechanisms in these ion conductive glasses and to find the role of cuprous halides producing Cu + ions. An analysis of the acoustical spectra using various theoretical models for the simulations with application of genetic algorithm was provided to fit the experimental data.…”