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Electronic band structure and thermoelectric properties of SrTiO3, BaTiO3 and CaTiO3: ab initio approach
Russian version
DOI: 10.21883/PSS.2022.12.54377.383
Zhukov V. P. 1, Chulkov E. V.2,3
1Institute of Solid State Chemistry, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
2St. Petersburg State University, St. Petersburg, Russia
3Dpto. de Poli meros y Materiales Avanzados: Fi sica, Qui mica y Tecnologi a, Facultad de Ciencias Qui micas, Aptdo., Donostia-San Sebastian, Basque Country, Spain
Email: evguenivladimirovich.tchoulkov@ehu.eus
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The calculations of Seebeck's coefficient, conductivity and power functions for the electron-doped SrTiO3, BaTiO3 and CaTiO3 compounds have been performed depending on temperature and current carrier concentration by employing ab initio method based on the electron density functional theory, on the Frohlich's approach for the electron-phonon interaction and on the theory of Boltzmann-Onsager for the thermoelectric properties. The calculated Seebeck's coefficient and conductivity correspond to experimental data. It is shown that for SrTiO3 and BaTiO3 the dependencies of power functions on the carrier concentration have maxima in the range of (200-250)·1019 cm-3 at any temperature, while for CaTiO3 the maxima are typical only at temperatures below 500 K. The temperature dependencies of the power function also confirm that such carrier concentration range is favorable for achieving high values of the SrTiO3 figure of merit, while the maximally possible carrier concentration is necessary for optimal CaTiO3 figure of merit. Keywords: Ca, Sr, Ba titanates, PAW method, electronic structure, thermoelectric properties.
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