The impedance of cells consisting of blocking electrodes and PbSnF4 fluoride-ion-conducting solid electrolyte was investigated. At temperatures below 20-degrees-C the components of electrolyte impedance were found to be determined by the superposition of geometric capacitance, grain-boundary impedance, and resistive impedance of the grains of polycrystalline material. It was shown by X-ray phase analysis that depending on gas-phase composition, the solid-state reaction between lead fluoride and tin fluoride yields the beta-phase, the alpha'-phase, or a mixture of these phases of PbSnF4 as the reaction products. It was seen when determining the conductivity of the polycrystalline two-phase mixture that the bulk conductivity of the grains is close to that of the radiographically pure beta-phase, while the grain-boundary conductivity is close to the conductivity of the alpha-phase. It was suggested that oxygen influences the phase composition of PbSnF4 at low temperatures.

The impedance of the electrochemical solid-state cell Pt \ Ce(SO4)2.4H2O \ Pt was measured in argon at temperatures between -20 and +60-degrees-C over the frequency range from 0.11 to 100 kHz. It was shown that the frequency dependence of impedance is in good agreement with the model of adsorptive double-layer relaxation at reversible electrodes. The double-layer capacitance, electrolyte conductivity, exchange current density of the charge transfer reaction, and Warburg constant for diffusional relaxation were determined. The results obtained were interpreted in terms of concepts that charge transport in the electrolyte is accomplished by virtual protons arising from dynamical dissociation of water. Large exchange current densities were determined at the platinum electrodes; these may be due to the Ce(IV) = Ce(III) redox reaction. It was suggested that double-layer relaxation is due to the diffusion of SO42- ions.

The impedance of the electrode/solid electrolyte interface was calculated for the case where the double-layer charge depends on adsorption. It was assumed that adsorption follows the Henry isotherm, and that its rate is diffusion-controlled. It was shown that the experimental data for double-layer impedance of the Ag/alpha-AgI interface correspond to I- ion adsorption, those for the Ag or C/Ag4RbI5 interface correspond to Rb+ adsorption.

The behavior of solid-state sensor cells Ag, Ag2SO4\MNaPW12O40.16H2O\Pt, H2, O2 (where M = Co, Ni, Cu) was investigated as a function of electrolyte composition and of hydrogen concentration in the gas phase. It was shown that the Nernst equation is obeyed by the cells in hydrogen-argon mixtures. In hydrogen-air mixtures the platinum electrode acquires a mixed hydrogen-oxygen potential the value of which depends on the degree of oxidation of the platinum and on the limitting current of hydrogen ionization. It was shown that the relaxation time of potential of the platinum increases in the order of Co < Ni < Cu, and the development of potential following a chemical pulse can be described by the Fouletier-Seinera-Kleitz equation.

In the electrochemical system: Ag + AgI \ (NH4)2HPW12O40.11H2O \ Ag + AgI, the baro-emf were measured as functions of time when pressure was applied to one of the electrodes. It was shown that when dry silver iodide is used, quasi-steady baro-emf develop which have values corresponding to the volume change which occurs when protons in the ammonium hydrogen tungstophosphate are replaced by silver ions and hydrogen iodide is formed. With moist silver iodide, it was not possible to measure steady baro-emf values; this was attributed to the dissolution of hydrogen iodide in water.

The ac impedance of the interface between beta-alumina membrane and molten mixtures CO(NH2)2+NaI+I2 or (C4H9)4Ni+I2 can be represented by parallel combination of a charge transfer resistance RF and Warburg impedance ZW=(1−j)Wω−12. The value of RF depends on electronic state of solid electrolyte. The Warburg impedance can be connected with slow diffusion of interstitial oxygen ions in the conducting planes between spinel blocks of beta-alumina.

Protonic conductivity of heteropoly compounds (HPC) A3PM12O40·nH2O, where A=H, Li, Na, K, Rb, Cs or NH4 and M=Mo or W, have been studied in dependence on the degree of hydration and temperature. The greatest conductivity is discovered for the salts of large cations Cs+, Rb+, K+ and NH+4. For sodium salts with the least hydration degrees the electronic conduction predominates. It is assumed that ionic conduction of HPC is connected with dynamic intracrystalline dissociation of water molecules and formation of virtual protons.

Longitudinal ultrasonic wave velocity and attenuation and also complex electric conductivity temperature and frequency dependencies have been measured in superionic Na 3 Zr 2 Si 2 PO 12 . At phase transition near T c =450 K the minimum of ultrasonic velocity and attenuation peak as well as two regions of ultrasonic relaxation in room temperature phase have been observed. The comparison of acoustic and electric measurements indicated that one of the relaxations is caused by acoustoionic interaction inside crystallites and the other by modulation of intercrystalline barriers.

The intercalation compounds Ag x TiS 2 have been both obtained by chemical synthesis and by electrochemical injection of the silver ions into TiS 2 from the solid electrolyte RbAg 4 I 5 . The impedance of the interface Ag x TiS 2 /RbAg 4 I 5 has been investigated. High reversibility of the intercalated electrodes is found. The exchange current density is equal to 10–20 mA/cm 2 at ambient temperature.