Al2O3(OR Ga2O3)-Gd2O3-CeO2 POWDER FOR CeO2-BASED OXYGEN IONIC CONDUCTORS DOPED WITH Gd2O3 AND PRODUCTION METHOD THEREOF

摘要

PURPOSE: A production method of Al2O3(or Ga2O3)-Gd2O3-CeO2 powder for CeO2-based oxygen ionic conductors doped with Gd2O3, is provided to form fine particles and lower sintering temperature by coprecipitating oxygen ionic conducting materials and sintering aid materials. CONSTITUTION: The CeO2-based oxygen ionic conductors doped with Gd2O3 are produced by the following steps of: (i) dissolving cerium nitrate, gadolinium nitrate, and aluminum nitrate in water, wherein the raw materials are measured in the proportions corresponding to (Ce0.8Gd0.2O1.9)1-x(Al2O3)x (x=0.01-0.05); (ii) forming coprecipitates by adding (NH4)2C2O4·H2O and NH4OH solution to the mixed solution until the pH of the solution is 10; (iii) washing coprecipitates with water and ethanol; (iv) drying at 120deg.C and calcining at 700deg.C for 1hr; (v) sieving dried powder to be less than 325mesh in size and pressing under pressure of 2000kg/cm2; (vi) sintering pressed compacts at 1400deg.C for 5hrs.