Solid electrolyte for use in oxygen concentration sensor

摘要

A solid electrolyte for an oxygen concentration sensor is provided by mixing ZrO2 and about 6.5 to about 8% by mol of a stabilizer such as Y2O3, grinding the mixture to give a BET specific surface area of about 9 to 20 m2/g, adding to the ground mixture a forming aid, forming the mixture into a predetermined configuration and firing the formed mixture at about 1420 DEG to 1570 DEG C. The electrolyte has a surface-average grain size of about 5 microns or less and a structure of a cubic phase alone at the surface thereof and, furthermore, may contain about 5% or less of a monoclinic phase per the total of the cubic and monoclinic phases, in a finely ground state.