Partial conductivities, oxygen exchange, and diffusion kinetics in SrTiO{sub 3}
- Max-Planch-Inst. fuer Festkoerperforschung, Stuttgart (Germany)
SrTiO{sub 3} is a sensor material of high significance due to its chemical stability and its rapid conductivity response on changes in the oxygen partial pressure. In contrast to most other oxides, the authors now have a quantitative set of the relevant equilibrium constants and mobilities of ionic and electronic charge carriers. In this contribution, the authors show that even subtle changes in ionic and electronic defect concentrations and therefore in ionic and electronic partial conductivity can be measured and calculated as a function of temperature, doping content and oxygen partial pressure. A further development of an optical relaxation experiment allows the detection and analysis of the time evolution of oxygen stoichiometry profiles in iron doped SrTiO{sub 3} single and bicrystals in-situ. Chemical diffusion coefficients can be calculated without fitting parameters by including the influence of internal coupling reactions to ambipolar transport. The influence of different interfaces (grain boundaries, cracks) will be demonstrated. Defect concentrations, conductivities, and chemical diffusion coefficients in grain boundary regions can be interpreted in terms of Schottky-barriers.
- OSTI ID:
- 441269
- Report Number(s):
- CONF-960782-; TRN: 96:006557-0040
- Resource Relation:
- Conference: 6. international meeting on chemical sensors, Gaithersburg, MD (United States), 22-25 Jul 1996; Other Information: PBD: 1996; Related Information: Is Part Of The 6th international meeting on chemical sensors; PB: 313 p.
- Country of Publication:
- United States
- Language:
- English
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