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Optimizing Thermoelectric Properties of In Situ Plasma-Spray-Synthesized Sub-stoichiometric TiO2-x Deposits
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SYSNO ASEP 0507465 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Optimizing Thermoelectric Properties of In Situ Plasma-Spray-Synthesized Sub-stoichiometric TiO2-x Deposits Author(s) Lee, H. (US)
Seshadri, R. (US)
Pala, Zdeněk (UFP-V) RID
Sampath, S. (US)Number of authors 4 Source Title Journal of Thermal Spray Technology. - : Springer - ISSN 1059-9630
Roč. 27, č. 6 (2018), s. 968-982Number of pages 15 s. Language eng - English Country US - United States Keywords stabilized zirconia coatings ; thermal-conductivity ; microstructure ; phase ; performance ; nanofluids ; metastable phases ; plasma spray ; thermal spray ; thermoelectric properties ; TiO2-x ; titanium oxides Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects GB14-36566G GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000441984900006 DOI 10.1007/s11666-018-0731-1 Annotation In this article, an attempt has been made to relate the thermoelectric properties of thermal spray deposits of sub-stoichiometric titania to process-induced phase and microstructural variances. The TiO2-x deposits were formed through the in situ reaction of the TiO1.9 or TiO1.7 feedstock within the high-temperature plasma flame and manipulated via varying the amounts of hydrogen fed into in the thermal plasma. Changes in the flow rates of H-2 in the plasma plume greatly affected the in-flight particle behavior and composition of the deposits. For reference, a high-velocity oxy-fuel spray torch was also used to deposit the two varieties of feedstocks. Refinements to the representation of the in-flight particle characteristics derived via single particle and ensemble diagnostic methods are proposed using the group parameters (melting index and kinetic energy). The results show that depending on the value of the melting index, there is an inverse proportional relationship between electrical conductivity and Seebeck coefficient, whereas thermal conductivity has a directly proportional relationship with the electrical conductivity. Retention of the original phase and reduced decomposition is beneficial to retain the high Seebeck coefficient or the high electrical conductivity in the TiO2 system. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2020 Electronic address https://link.springer.com/article/10.1007%2Fs11666-018-0731-1
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