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

R P H Chang, J. B. WAGNER

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

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 (US)
Pages (from-to)211-213
Number of pages3
JournalJournal of the American Ceramic Society
Volume55
Issue number4
DOIs
StatePublished - Jan 1 1972

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Hematite
Partial pressure
Iron
Temperature
Crystal defects
Activation energy
Semiconductor materials
ferric oxide
Electrons

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "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.",
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Direct‐Current Conductivity and Iron Tracer Diffusion in Hematite at High Temperatures. / Chang, R P H; WAGNER, J. B.

In: Journal of the American Ceramic Society, Vol. 55, No. 4, 01.01.1972, p. 211-213.

Research output: Contribution to journalArticle

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