Ageing of ZrO2-based solid electrolytes
Abstract An investigation has been carried out on the regularities of ageing of ZrO2-based solid electrolytes stabilized with Y2O3, Ho2O3, So2O3 of various concentrations in the single-and two-phase regions of the solid solution phase diagram. For electrolytes pertaining to the two-phase region of the phase diagram, time dependences of electrical conductivity adequately describing its variation in a wide-time interval are proposed. Causes of ageing in single-phase electrolytes are discussed. A noticeable contribution, which can be both positive and negative, to the ageing intensity by the change in elecelectrical conductivity of grain boundaries of polycrystalline solid electrolytes has been established. The effect of high ageing rate on the results of measurement of electrical conductivity of solid electrolytes is noted.