Chemical diffusion in CoO |
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Authors: | JM Wimmer RN Blumenthal I Bransky |
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Institution: | Aerospace Research Laboratory, Metallurgy and Ceramics Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, U.S.A.;College of Engineering, Marquette University, Milwaukee, WI 53233, U.S.A.;State of Israel, Ministry of Defense, Tel Aviv, P.O. Box 7063, Israel |
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Abstract: | Equilibration kinetics of CoO have been studied over the range 1–10?5 atm oxygen pressure and 900–1300°C by both thermogravimetric and electrical conductivity techniques. The former technique gives excellent agreement with theory based on bulk diffusion and results in a chemical diffusion coefficient given by, cm. The defect diffusion coefficient (Dinvinco) is equal to . No dependence of ?tD on defect concentration was observed. The electrical conductivity technique qualitatively supports these results. |
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