| 摘要 |
PURPOSE:To make the subject electrolyte free from dimensional change caused by heating or cooling, by specifying the solid electrolyte composition comprising mainly Y2O3 and ZrO2 in its composition molar ratio, particle phase of the crystal grains and the average particle size to improve the deterioration with the passage of time in a certain temperature range. CONSTITUTION:In a zirconia ceramic solid electrolyte mainly consisting of ZrO2 and Y2O3, the molar ratio of Y2O3/ZrO2 is specified in a range from 2/98 to 7/93, the crystal particles are mainly tetragonal or tetragonal and cubic, and the average particle size is adjusted to less than 2 microns so that the elctrolyte are reduced in deterioration in its strength in a specific temperature range from 200 to 300 deg.C and no dimension change is caused by heating and cooling in a temperature range from room temperature to 800 deg.C. The solid electrolyte is preferably prepared by mixing ZrO2 of less than 1,000Angstrom particle sizes which has been formed by pyrolysis of Zr(OH), with Y2O3 at an above- stated specific molar ratio, molding and calcining the molded products at 1,000 to 1,550 deg.C. |
