THE INFLUENCE OF THE SIZE FACTOR ON THE POLYALKALI EFFECT IN SOLID ELECTROLYTES WITH THE GAMMA-KFEO2 STRUCTURE

Electroconductivity of solid solutions with the structure gamma-KFeO2 is studied in the systems: (1-y)K1-xRbxAlO2 . yTiO(2) (y = 0.20, 0.30) , (1-y)K1-xRbxFeO2 . yGeo(2) (y = 0.10, 0.15, 0.20), 0.9Rb(1-x)Cs(x)Ga O(2) . 0.05GeO(2) . 0.05TiO(2), and (1-y)Rb1-xCsxFeO2 . yGeO(2) (y = 0 .10, 0.15, 0.20, 0.30). Dependences of ionic conductivity and activati on energy on the ratio between the amounts of different alkali cations are found to be of an extreme nature (the polyalkali effect). The res ults obtained are compared with the study of other similar systems. It is established that the concentration of EO(2) (E = Si, Ti, Ge) and t he nature of cations of the rigid lattice do not noticeably affect the polyalkali effect. The principal factor governing the magnitude of th e latter in the above systems is the volume of an elementary cell.