Designing strontium titanate-based thermoelectrics: insight into defect chemistry mechanisms
authors Kovalevsky, AV; Aguirre, MH; Populoh, S; Patricio, SG; Ferreira, NM; Mikhalev, SM; Fagg, DP; Weidenkaff, A; Frade, JR
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY A
keywords NB-DOPED SRTIO3; ELECTRONIC TRANSPORT-PROPERTIES; THERMAL-CONDUCTIVITY; POWER-GENERATION; VACANCY CLUSTERS; SINGLE-CRYSTALS; THIN-FILMS; PERFORMANCE; CERAMICS; OXIDE
abstract Driven by a need to develop low-cost and thermally stable materials for thermoelectric applications, donor-substituted strontium titanate is considered as a promising alternative to traditional thermoelectrics. The complex defect chemistry of SrTiO3-based materials imposes various limitations on identifying the relevant effects exerted on the electronic band structure and heat transfer, being a subject of debate and intensive research. Based on combined XRD, SEM/EDS, HRTEM, XPS, and TGA studies and measurements of thermoelectric properties, this work uncovers the particular role of various structural defects in electrical and thermal transport in Sr1 +/- yTi0.9Nb0.1O3 +/-delta, selected as a model system. Introduction of A-site cation vacancies provides a synergistic effect of combining fast charge transport in the perovskite lattice and suppressing the thermal conductivity mostly due to simultaneous generation of oxygen vacancies. The presence of oxygen vacancies promotes more efficient phonon scattering compared to Ruddlesden-Popper-type layers. These findings provide a link between structural and thermoelectric properties, offering further prospects for seeking highly performing SrTiO3-based thermoelectrics by tailoring the defect chemistry mechanisms.
publisher ROYAL SOC CHEMISTRY
issn 2050-7488
year published 2017
volume 5
issue 8
beginning page 3909
ending page 3922
digital object identifier (doi) 10.1039/c6ta09860f
web of science category Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary
subject category Chemistry; Energy & Fuels; Materials Science
unique article identifier WOS:000395309800018
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journal analysis (jcr 2017):
journal impact factor 9.931
5 year journal impact factor 9.531
category normalized journal impact factor percentile 92.768
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