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Defect Chemistry of Donor Doped and Undoped Strontium Titanate Ceramics between 1000°C and 1400°C

Title data

Moos, Ralf ; Härdtl, Karl Heinz:
Defect Chemistry of Donor Doped and Undoped Strontium Titanate Ceramics between 1000°C and 1400°C.
In: Journal of the American Ceramic Society. Vol. 80 (1997) Issue 10 . - pp. 2549-2562.
ISSN 1551-2916
DOI: https://doi.org/10.1111/j.1151-2916.1997.tb03157.x

Official URL: Volltext

Abstract in another language

The electrical conductivity, sigma, of donor-doped and undoped strontium titanate (SrTiO3) ceramics and, in some cases, single crystals, Sr1-xLaxTiO3 (0 ≤ to x ≤ 0.1), was investigated in the temperature range of 1000°-1400°C under oxygen partial pressures, PO2, of 10^-20 - 1 bar. In conjunction with Hall data and thermopower data from related papers, a set of constants for a defect-chemical model was determined, precisely describing point-defect concentrations and transport properties of these materials. In contrast to former works, temperature-dependent transport parameters and their non-negligible influence on the determination of the constants was considered, as well as the equilibrium restoration phenomena of the cation sublattice, which can be studied only at such high temperatures. It was shown that defects in the cation sublattice completely govern the electrical behavior of donor-doped and undoped SrTiO3. In the latter case, frozen-in strontium vacancies act as intrinsic acceptors, determining the sigma(PO2) curves at lower temperatures. This intrinsic acceptor concentration also can be calculated with this model. The very good agreement between calculation and measurement is shown in many examples.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 03 Feb 2015 09:24
Last Modified: 04 Apr 2016 07:38
URI: https://eref.uni-bayreuth.de/id/eprint/6173