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Issue 38, 2016
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Tuning the thermoelectric properties of A-site deficient SrTiO3 ceramics by vacancies and carrier concentration

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Abstract

Ceramics based on Sr0.8La0.067Ti0.8Nb0.2O3−δ have been prepared by the mixed oxide route. The La1/3NbO3 component generates ∼13.4% A-site vacancies; this was fixed for all samples. Powders were sintered under air and reducing conditions at 1450 to 1700 K; products were of high density (>90% theoretical). Processing under reducing conditions led to the formation of a Ti1−xNbxO2−y second phase, core–shell structures and oxygen deficiency. X-ray diffraction (XRD) confirmed a simple cubic structure with space group Pm[3 with combining macron]m. Transmission electron microscopy revealed a high density of dislocations while analytical scanning transmission electron microscopy at atomic resolution demonstrated a uniform distribution of La, Nb and vacancies in the lattice. X-ray photoemission spectroscopy and thermogravimetry showed the oxygen deficiency (δ value) to be ∼0.08 in reduced samples with enhanced carrier concentrations ∼2 × 1021 cm−3. Both carrier concentration and carrier mobility increased with sintering time, giving a maximum figure of merit (ZT) of 0.25. Selective additional doping by La or Nb, with no additional A site vacancies, led to the creation of additional carriers and reduced electrical resistivity. Together these led to enhanced ZT values of 0.345 at 1000 K. The contributions from oxygen vacancies and charge carriers have been investigated independently.

Graphical abstract: Tuning the thermoelectric properties of A-site deficient SrTiO3 ceramics by vacancies and carrier concentration

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Publication details

The article was received on 09 Aug 2016, accepted on 07 Sep 2016 and first published on 07 Sep 2016


Article type: Paper
DOI: 10.1039/C6CP05523K
Citation: Phys. Chem. Chem. Phys., 2016,18, 26475-26486
  • Open access: Creative Commons BY license
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    Tuning the thermoelectric properties of A-site deficient SrTiO3 ceramics by vacancies and carrier concentration

    D. Srivastava, C. Norman, F. Azough, M. C. Schäfer, E. Guilmeau, D. Kepaptsoglou, Q. M. Ramasse, G. Nicotra and R. Freer, Phys. Chem. Chem. Phys., 2016, 18, 26475
    DOI: 10.1039/C6CP05523K

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