LATTICE AND GRAIN-BOUNDARY DIFFUSION OF CA IN POLYCRYSTALLINE YTTRIA-STABILIZED ZRO2 DETERMINED BY EMPLOYING SIMS TECHNIQUE

Diffusion profiles of Ca in highly densified polycrystalline yttria-st abilized (10 mol %) ZrO2 were investigated by secondary ion mass spect roscopy (SIMS). Lattice diffusion coefficient in temperature range of 1073 to 1273 K was determined: D-Lattice = 0.458 exp[-393.3 (kJ/mol)/R T] (cm(2)/sec). Grain boundary diffusion was estimated based on the Wh ipple's analysis. As a result, values of D(Boundary)delta s can be rep resented by D(Boundary)delta s = 4.85 X 10(-1)3 exp[-185.8 (kJ/mol)/RT ] (cm(3)/sec), where D-Boundary is the grain boundary diffusion coeffi cient, delta the grain boundary width and s the segregation factor. (C ) 1998 Elsevier Science B.V. All rights reserved.