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High-Figure-of-Merit Thermoelectric La-Doped A-Site-Deficient SrTiO3 Ceramics

Lu, Zhilun; Zhang, Huairuo; Lei, Wen; Sinclair, Derek C.; Reaney, Ian M.

Authors

Zhilun Lu

Huairuo Zhang

Wen Lei

Derek C. Sinclair

Ian M. Reaney



Abstract

The structure and thermoelectric (TE) properties of La-doped, A-site-deficient SrTiO3 (Sr1–3x/2LaxTiO3) ceramics sintered in air and N2/5% H2 have been investigated. Air-sintered ceramics with 0.10 ≤ x < 0.30 appear cubic by X-ray diffraction (XRD) but exhibit superstructure consistent with a tetragonal cell (a0a0c–), according to electron diffraction (ED) studies. 0.30 ≤ x < 0.50 have additional short-range A-site vacancy (VA) ordering, and x ≥ 0.50 are orthorhombic with an a–a–c+ tilt system and long-range VA ordering. 0.10 ≤ x ≤ 0.50 reduced in N2/5% H2 are oxygen-deficient and appear cubic in XRD patterns but exhibit superstructure compliant with an a0a0c– tilt system by ED. For x = 0.50, additional short-range VA order is observed, and x > 0.50 are orthorhombic with an a–a–c+ tilt system and long-range VA ordering. x = 0.15 sintered in N2/5% H2 shows the largest dimensionless TE figure-of-merit ZT = 0.41 at 973 K reported for n-type SrTiO3-based ceramics, suggesting that the accommodation of La through formation of (VSr) coupled with reduction in N2/5% H2 represents a new protocol for the development of oxide-based thermoelectrics.

Journal Article Type Article
Acceptance Date Jan 6, 2016
Online Publication Date Jan 21, 2016
Publication Date Feb 9, 2016
Deposit Date Oct 23, 2021
Publicly Available Date Oct 26, 2021
Journal Chemistry of Materials
Print ISSN 0897-4756
Electronic ISSN 1520-5002
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 28
Issue 3
Pages 925-935
DOI https://doi.org/10.1021/acs.chemmater.5b04616
Public URL http://researchrepository.napier.ac.uk/Output/2815446

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