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Zusammenfassung:
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.
