Abnormal Grain Growth as a Method To Enhance the Thermoelectric Performance of Nb-Doped Strontium Titanate Ceramics
authors Tkach, A; Resende, J; Saravanan, KV; Costa, ME; Diaz-Chao, P; Guilmeau, E; Okhay, O; Vilarinho, PM
nationality International
journal ACS SUSTAINABLE CHEMISTRY & ENGINEERING
author keywords Perovskite oxide electroceramics; Donor doping; Submicrometer particles; Two-step sintering; Microstructure engineering; Thermoelectric figure of merit
keywords SRTIO3; MICROSTRUCTURE; OXIDE
abstract Driven by the need for high-temperature n-type thermoelectrics for energy-harvesting sectors, SrTi0.8Nb0.2O3 +/-delta ceramics are prepared here from powders with average particle sizes of 270 and 800 nm by the conventional sintering in air at 1450 degrees C and further in H-2/N-2 at 1400 degrees 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 +/- 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.
publisher AMER CHEMICAL SOC
issn 2168-0485
year published 2018
volume 6
issue 12
beginning page 15988
ending page 15994
digital object identifier (doi) 10.1021/acssuschemeng.8b03875
web of science category Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Engineering, Chemical
subject category Chemistry; Science & Technology - Other Topics; Engineering
unique article identifier WOS:000452344900010
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