The diffusion of oxygen in ultrafine grained, undoped monoclinic ZrO2 was studied using 18O as tracer and secondary ion mass spectroscopy profiling. Samples with a relative mass density of 97%-99% and average crystallite sizes of 80 or 300 nm were prepared from Zr by sputtering, inert-gas-condensation, oxidation, in situ consolidation of nanocrystalline (n-)ZrO2 powder and subsequent pressureless sintering at 950 or 1050°C in vacuum. Volume and interface diffusivities were directly determined from the 18O diffusion profiles in n-ZrO2 in the type B and type A regime of interface diffusion. The diffusion of 18O in interfaces in undoped n-ZrO2 is 103-104 times faster than in the bulk of the crystallites throughout the temperature range of 450 to 950°C studied. These diffusivities are independent of the crystallite size in the range of 70-300 nm. The activation energies QV=2.29eV and QB=1.95eV for the volume (QV) and interface diffusion (QB) are considerably higher than the diffusion activation energies found in the fast ion conductors Ca- or Y-stabilized ZrO2. Based on the present data on oxygen diffusion in ZrO2, the cation and anion diffusivities of other binary oxides are discussed. © 1999 American Institute of Physics.
CITATION STYLE
Brossmann, U., Würschum, R., Södervall, U., & Schaefer, H. E. (1999). Oxygen diffusion in ultrafine grained monoclinic ZrO2. Journal of Applied Physics, 85(11), 7646–7654. https://doi.org/10.1063/1.370567
Mendeley helps you to discover research relevant for your work.