Abstract
Electrotransport mobilities and diffusion coefficients were obtained for radiotracer impurities of Fe, Co, and Ag in Ce. The iron and cobalt moved toward the anode with mobilities of ∼10−3 cm2/v-s in the range of 550° to 650°C. The silver moved to the cathode with mobilities of ∼10−5 cm2/v-s in the range of 600° to 700°C. The, diffusion coefficients obtained fit an Arrhenius equationD=D o e −ΔH/RT with the following parameters: Fe:D o=3.3×10−4, ΔH=4.6 kcal/mole Co:D o=10−2, ΔH=11 kcal/mole Ag:D o=1.4, ΔH=28 kcal/mole The results are compared with other rare-earth diffusion data, and the possibility of a substitutional-interstitial diffusion mechanism, is considered.
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