Ordering and grain boundary effects on ionic conductivity in ZrO2-Gd2O3 and ZrO2-Nd2O3 ceramics / Theo van DijkElectrical conductivity and interface properties of oxygen ion conducting materials / door Maarten Johannes VerkerkThe potassium conductance in frog nodal membrane : a kinetic study / Gerrit de BruinOn the fluorine ionic motion in some solid electrolytes / Albert Ferdinand AaldersThe ionic conductivity and defect structure of fluorite-type solid solutions Ba1-xUxF2+2x / Martin OuwerkerkIonic conduction and dielectric loss in fluorite-type solid solutions / Koenraad Eldert Dirk Wapenaar