Research Output
Effects of Processing Strategies and La+Sm Co-Doping on the Thermoelectric Performance of A-Site-Deficient SrTiO3-δ Ceramics
  The effect of calcining in either air (VSTO-A) or 5% H2/N2 (VSTO-H) on the thermoelectric performance of La and Sm co-doped A-site-deficient Sr1-3x/2Lax/2Smx/2TiO3-δ ceramics is reported. All calcined powders were sintered 6 h in 5% H2/N2 at 1773 K to ≥96% relative density. All peaks in X-ray diffraction patterns indexed as a cubic perovskite phase. Scanning electron microscopy revealed grain sizes ~14 and ~10 μm for VSTO-A and VSTO-H ceramics, respectively. x = 0.30 showed the lowest k (2.99 W/m.K at 973 K) for VSTO-A, whereas x = 0.20 had the lowest (2.67 W/m. K at 973 K) for the VSTO-H ceramics. x = 0.30 VSTO-A showed a thermoelectric figure of merit, ZT = 0.25 (at 973 K), whereas the maximum ZT = 0.30 (at 973 K) was achieved for x = 0.20 VSTO-H ceramics, demonstrating that thermoelectric properties are optimized when all processing is carried out in 5% H2/N2.

  • Type:

    Article

  • Date:

    12 November 2022

  • Publication Status:

    Published

  • DOI:

    10.3390/cryst12111622

  • Funders:

    Engineering and Physical Sciences Research Council

Citation

Iyasara, A., Lu, Z., Schmidt, W., Sinclair, D., & M. Reaney, I. (2022). Effects of Processing Strategies and La+Sm Co-Doping on the Thermoelectric Performance of A-Site-Deficient SrTiO3-δ Ceramics. Crystals, 12(11), Article 1622. https://doi.org/10.3390/cryst12111622

Authors

Keywords

thermoelectrics; solid-state reaction; particle size; grain structure; thermal conductivity

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