Jump to main content
Jump to site search

Issue 8, 2017
Previous Article Next Article

Designing strontium titanate-based thermoelectrics: insight into defect chemistry mechanisms

Author affiliations

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 SryTi0.9Nb0.1Oδ, 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.

Graphical abstract: Designing strontium titanate-based thermoelectrics: insight into defect chemistry mechanisms

Back to tab navigation

Article information


Submitted
14 Nov 2016
Accepted
03 Jan 2017
First published
03 Jan 2017

J. Mater. Chem. A, 2017,5, 3909-3922
Article type
Paper

Designing strontium titanate-based thermoelectrics: insight into defect chemistry mechanisms

A. V. Kovalevsky, M. H. Aguirre, S. Populoh, S. G. Patrício, N. M. Ferreira, S. M. Mikhalev, D. P. Fagg, A. Weidenkaff and J. R. Frade, J. Mater. Chem. A, 2017, 5, 3909
DOI: 10.1039/C6TA09860F

Social activity

Search articles by author

Spotlight

Advertisements