Supported by the American Iron and Steel Institute as Project No. 35–135.
Direct-Current Conductivity and Iron Tracer Diffusion in Hematite at High Temperatures
Article first published online: 2 JUN 2006
Journal of the American Ceramic Society
Volume 55, Issue 4, pages 211–213, April 1972
How to Cite
CHANG, R. H. and WAGNER, J. B. (1972), Direct-Current Conductivity and Iron Tracer Diffusion in Hematite at High Temperatures. Journal of the American Ceramic Society, 55: 211–213. doi: 10.1111/j.1151-2916.1972.tb11261.x
- Issue published online: 2 JUN 2006
- Article first published online: 2 JUN 2006
- Received September 22, 1971.
The dc conductivity of natural single-crystal α-Fe2O3 was measured as a function of O partial pressure from 10−4 to 1 atm at 950° to 1422°C. The conductivity was independent of O2 partial pressure, indicating that hematite is an intrinsic semiconductor with lattice defect concentrations much lower than the concentration of intrinsic electrons (holes). The activation energy of the dc conductivity was 1.18 eV. The iron tracer (55Fe) diffusion coefficients, measured as a function of O2 partial pressure at 1200° and 1300°C, increased as the O2 partial pressure decreased, with a pressure dependence of -0.75; the iron therefore migrates interstitially.