Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 12, Pages 15988-15994Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b03875
Keywords
Perovskite oxide electroceramics; Donor doping; Submicrometer particles; Two-step sintering; Microstructure engineering; Thermoelectric figure of merit
Categories
Funding
- FCT/MEC [POCI-01-0145-FEDER-007679, UID/CTM/50011/2013]
- FEDER
- FCT [IF/00602/2013]
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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.
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