Direct‐Current Conductivity and Iron Tracer Diffusion in Hematite at High Temperatures

Robert P. H. Chang, J. B. WAGNER

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)211-213
Number of pages3
JournalJournal of the American Ceramic Society
Issue number4
Publication statusPublished - 1972

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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