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- Publisher
- Springer Journals
- Copyright
- Copyright © 2010 by Springer-Verlag
- Subject
- Chemistry; Condensed Matter Physics; Optical and Electronic Materials; Renewable and Green Energy; Electrochemistry
- ISSN
- 0947-7047
- eISSN
- 1862-0760
- DOI
- 10.1007/s11581-010-0477-3
- Publisher site
- See Article on Publisher Site
Abstract
The present work reports semiconducting properties of high purity TiO2 determined in the gas/solid equilibrium, as well as during controlled heating and cooling in the range 300–1,273 K. The activation energy of the electrical conductivity is considered in terms of the activation enthalpy of the formation of ionic defects and the activation enthalpy of the mobility of electronic defects. These data, determined from the dynamic electrical conductivity experiments, are compared to the electrical conductivity data determined in equilibrium. It is shown that only the equilibrium electrical conductivity data for high-purity TiO2 are well defined. It is shown that the activation energy of the electrical conductivity determined in equilibrium differs substantially from that for the dynamic electrical conductivity data during cooling and heating. It is concluded that the formation enthalpy term determined from the dynamic conductivity data is determined by the heating/cooling rate rather than materials’ properties.
Journal
Ionics – Springer Journals
Published: Oct 6, 2010