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Thermoelectric Properties of Self Assembled TiO2/SnO2 NanocompositesRecent advances in improving efficiency of thermoelectric materials are linked to nanotechnology. Thermodynamically driven spinodal decomposition was utilized to synthesize bulk nanocomposites. TiO2/SnO2 system exhibits a large spinodal region, ranging from 15 to 85 mole % TiO2. The phase separated microstructures are stable up to 1400 C. Semiconducting TiO2/SnO2 powders were synthesized by solid state reaction between TiO2 and SnO2. High density samples were fabricated by pressureless sintering. Self assemble nanocomposites were achieved by annealing at 1000 to 1350 C. X-ray diffraction reveal phase separation of (Ti(x)Sn(1-x))O2 type phases. The TiO2/SnO2 nanocomposites exhibit n-type behavior; a power factor of 70 W/mK2 at 1000 C has been achieved with penta-valent doping. Seebeck, thermal conductivity, electrical resistivity and microstructure will be discussed in relation to composition and doping.
Document ID
20090004672
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Dynys, Fred (NASA Glenn Research Center Cleveland, OH, United States)
Sayir, Ali (Case Western Reserve Univ. Cleveland, OH, United States)
Sehirlioglu, Alp (Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
May 26, 2008
Subject Category
Composite Materials
Report/Patent Number
E-16834
Meeting Information
Meeting: European Materials Resource Society Conference
Location: Strasbourg
Country: France
Start Date: May 26, 2008
End Date: May 30, 2008
Funding Number(s)
WBS: WBS 138494.04.02.01
Distribution Limits
Public
Copyright
Public Use Permitted.

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