Electron mobility of Sr1-xLaxTiO3 ceramics between 600°C and 1300°C

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Moos, Ralf ; Schöllhammer, Sylvia ; Härdtl, Karl Heinz:
Electron mobility of Sr1-xLaxTiO3 ceramics between 600°C and 1300°C.
In: Applied Physics A. Bd. 65 (1997) Heft 3 . - S. 291-294.
ISSN 1432-0630
DOI: https://doi.org/10.1007/s003390050581

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Abstract

The conductivities of differently reduced n-type conducting Sr1−xLaxTiO3 ceramics (0.003<x<0.40) were measured between 600°C and 1300°C. The density of electrons in the conduction band was determined from Hall and thermopower measurements. A chemical approach (Ti3+-titration) confirmed these results. The electron mobility was calculated by combining charge carrier density and conductivity data. The temperature dependence of the mobility obeys a power law. Its exponent varies from -1.5 for slightly doped samples (x=0.003) to -2.74 for lanthanum-rich samples (x=0.4) indicating a phonon scattering controlled transport behavior. The mobility data obtained from slightly doped ceramic samples agree very well with Hall mobilities found in undoped SrTiO3 single crystals.