Abstract
Abstract The interdiffusion coefficients \ ildeD of Zn2+ ions in aluminium cobalt(II) oxide (cobalt aluminate) and aluminium nickel(II) oxide (nickel aluminate) were measured. In the former \ ildeD is independent of the concentration of the composition-dependent cation vacancies, while in the latter it decreases with increase in the concentration of cation vacancies. The difference in the distribution of cations and cation vacancies in the spinel lattice has a great effect on the interdiffusion coefficients of Zn2+ ions. The results were interpreted by means of the vacancy mechanism for Co2+ and Ni2+ ions and the interstitial or interstitialcy mechanism for Zn2+ ions. The activation energy is independent of the concentration of Zn2+ ions or cation vacancies; 355 kJ mol−1 for cobalt aluminate and 364 kJ mol−1 for nickel aluminate.
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