Abstract
The electron magnetic resonance (EMR) technique was used to investigate the diffusion of chromium in yttria (Y 2O 3) powders. The EMR absorption intensity was measured for several annealing times and three different temperatures of isothermal annealing: 1273, 1323 and 1373 K. The activation temperature for diffusion, calculated from the experimental data using a theoretical model based on the Fick equation, was found to be E A =342±5 kJ mol −1. This value is larger than the activation energy for the diffusion of chromium in rutile (TiO 2), periclase (MgO) and cobalt monoxide (CoO) and smaller than the activation energy for the diffusion of chromium in chrysoberyl (BeAl 2O 4).
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