Kinetics of Fe2+ oxidation and Fe3+ reduction in MgO single crystals
- 15 May 1979
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 70 (10) , 4603-4608
- https://doi.org/10.1063/1.437294
Abstract
Electron paramagnetic resonance measurements have been used to determine the rate of change of the Fe3+ concentration in MgO:Fe crystals due to reduction and oxidation with ambient gases at temperatures between 1000 and 1500 K. The results indicate that diffusion of vacancies with an activation energy of 3.23 eV is the rate‐limiting step. There is some evidence that when a diffusion coefficient is obtained from a concentration profile, a contribution due to anomalously high mobility (presumably along dislocations) can be detected.Keywords
This publication has 8 references indexed in Scilit:
- The effect of electric current on the conductivity of MgO single crystals at temperatures above 1300 KJournal of Applied Physics, 1978
- Determination of the Fe2+ and Fe3+ concentration in MgOJournal of Applied Physics, 1977
- Electron paramagnetic resonance of Fe3+in orthorhombic symmetry sites in magnesium oxideJournal of Physics C: Solid State Physics, 1977
- Role of hydrogen and deuterium on the-center formation in MgOPhysical Review B, 1975
- Cation self-diffusion in MgO up to 2350°cPhilosophical Magazine, 1972
- Diffusion in polycrystalline magnesiowüstite determined by reduction kineticsJournal of Solid State Chemistry, 1971
- An e.p.r. study of vacancy-impurity association in MgOJournal of Physics C: Solid State Physics, 1971
- Defects in the alkaline earth oxidesAdvances in Physics, 1968