Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 20, Pages 28992-28999Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.07.060
Keywords
Strontium titanate solid solutions; Thermoelectric oxide materials; Mechanochemical activation
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Funding
- Russian Science Foundation [19-72-00097]
- Russian Science Foundation [19-72-00097] Funding Source: Russian Science Foundation
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The properties of Sr1-xSmxTiO3 solid solutions are significantly influenced by the preliminary mechanochemical activation, with samples reduced in hydrogen showing the highest thermoelectric power factor within a specific concentration range. Increasing the annealing temperature of mechanically activated samples leads to a further increase in electrical conductivity and power factor.
The Sr1-xSmxTiO3 (x = 0.025, 0.05, 0.075, 0.1, 0.2) strontium titanate solid solutions were prepared from oxides and carbonates using a conventional ceramic technology based on the mechanochemical activation. The electrical conductivity and Seebeck coefficient of the synthesized compounds were measured in the temperature range from 300 to 800 K. We found that the properties of the samples significantly depend on the preliminary mechanochemical activation. The thermoelectric power factor attains maximum value in the hydrogen reduced samples with concentration of x = 0.05 and 0.075 obtained from nanoparticles: 5.5 mu W/(cm.K-2) for Sr0.95Sm0.05TiO3 (580 K) and 4.10 mu W/(cm.K-2) for Sr0.925Sm0.075TiO3 (650 K). An increase in the annealing temperature of mechanically activated samples leads to an even greater increase in electrical conductivity and power factor: 9.2 mu W/(cm.K-2) for Sr0.925Sm0.075TiO3 (650 K).
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