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 language | English (US) |
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Pages (from-to) | 405-411 |
Number of pages | 7 |
Journal | Journal of Physics and Chemistry of Solids |
Volume | 53 |
Issue number | 3 |
DOIs | |
State | Published - Mar 1992 |
Funding
t Work supported by the U.S. Department of Energy, BES-Materials Sciences, under contracts W-31-109-ENG-38 and FGO2-84ER45097. (1P resent address: Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.
Keywords
- Cobalt monoxide
- diffusion
- electrical conductivity
- non-stoichiometry
- point defects
- small polaron
- thermoelectric power
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics