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Magnéli phases Ti4O7 and Ti8O15 and their carbon nanocomposites via the thermal decomposition-precursor route

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons126891

Veremchuk,  I.
Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126626

Grin,  Yu.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Conze, S., Veremchuk, I., Reibold, M., Matthey, B., Michaelis, A., Grin, Y., et al. (2015). Magnéli phases Ti4O7 and Ti8O15 and their carbon nanocomposites via the thermal decomposition-precursor route. Journal of Solid State Chemistry, 229, 235-242. doi:10.1016/j.jssc.2015.04.037.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-52A8-7
Abstract
A new synthetic approach for producing nano-powders of the Magneli phases Ti4O7, Ti8O15 and their carbon nanocomposites by thermal decomposition-precursor route is proposed. The formation mechanism of the single-phase carbon nanocomposites (Ti4O7/C and Ti8O15/C) from metal-organic precursors is studied using FT-IR, elemental analysis, TG, STA-MS and others. The synthesis parameters and conditions were optimized to prepare the target oxides with the desired microstructure and physical properties. The electrical and transport properties of Ti4O7/C and Ti8O15/C are investigated. These nano-materials are n-type semiconductors with relatively low thermal conductivity in contrast to the bulk species. The nanostructured carbon nanocomposites of Magneli phases achieve a low thermal conductivity close to 1 W/m K at RT. The maximum ZT(570) (degrees C) values are 0.04 for Ti4O7/C powder nanocomposite and 0.01 for Ti8O15/C bulk nanocomposite. (C) 2015 Elsevier Inc. All rights reserved.