Non-stoichiometry, electrical properties, and cation diffusion in highly non-stoichiometric Co1-xO-I. Experimental†

K. Persels Constant, Thomas O Mason, S. J. Rothman, J. L. Routbort

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Non-stoichiometry and mass and electrical transport properties were measured in pure, single crystal Co1-xO with 0.003 ≤ x ≤ 0.044. Electrical conductivity and thermopower were measured at temperatures from 1000°C to 1200°C in a range of oxygen partial pressures, Po2 , of 0.21 to 32atm. The cation tracer diffusion coefficient was measured at 1200°C in the same pressure range, and at 3.7 atm from 1064°C to 1200°C. Electrical properties were used to locate the Co1-xO/Co3O4 phase boundary. All properties show a stronger po2 , dependence than predicted by a point defect theory based on ideal solutions. Analysis of the temperature dependence of hole mobility produced an activation energy for small polaron hopping of 0.37 ± 0.04 eV.

Original languageEnglish
Pages (from-to)405-411
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume53
Issue number3
DOIs
Publication statusPublished - 1992

Keywords

  • Cobalt monoxide
  • diffusion
  • electrical conductivity
  • non-stoichiometry
  • point defects
  • small polaron
  • thermoelectric power

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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