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Abnormal Grain Growth as a Method To Enhance the Thermoelectric Performance of Nb-Doped Strontium Titanate Ceramics

Abstract : Driven by the need for high-temperature n-type thermoelectrics for energy-harvesting sectors, SrTi0.8Nb0.2O3±δ ceramics are prepared here from powders with average particle sizes of 270 and 800 nm by the conventional sintering in air at 1450 °C and further in H2/N2 at 1400 °C. In contrast to coarse particle powders, the use of fine particle powders under these conditions leads to abnormal grain growth and thereby bimodal grain size distribution in SrTi0.8Nb0.2O3±δ ceramics. As a result, a 3-fold increase in the thermoelectric figure of merit to 0.36 at 970 K is achieved, thus establishing the record value for bulk Nb-doped strontium titanate up to this temperature.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02327407
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Submitted on : Friday, November 8, 2019 - 3:21:56 PM
Last modification on : Monday, July 20, 2020 - 10:06:05 AM

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João Resende, Maria Elisabete Costa, Alexander Tkach, Joao Resende, K. Venkata Saravanan, et al.. Abnormal Grain Growth as a Method To Enhance the Thermoelectric Performance of Nb-Doped Strontium Titanate Ceramics. ACS Sustainable Chemistry & Engineering, American Chemical Society, 2018, 6 (12), pp.15988-15994. ⟨10.1021/acssuschemeng.8b03875⟩. ⟨hal-02327407⟩

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