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Aqueous Co‐precipitated Ti 0.5 Sn 0.5 O 2 Nanopowders as Precursors for Dense Spinodally Decomposed Ceramics
Author(s) -
Hochepied JeanFrançois,
Berger MarieHélène,
Dynys Fred,
Dessombz Arnaud,
Sayir Ali
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04797.x
Subject(s) - materials science , ceramic , spinodal decomposition , chemical engineering , sintering , nanostructure , precipitation , evaporation , aqueous solution , oxide , thermal decomposition , tin oxide , spinodal , microstructure , mesoporous material , nanotechnology , composite material , phase (matter) , metallurgy , chemistry , physics , organic chemistry , meteorology , engineering , thermodynamics , biochemistry , catalysis
Spinodal decomposition in the TiO 2 – SnO 2 system produces TiO 2 rich/ SnO 2 rich nano‐wide lamellae. The high density of coherent interfaces is expected to reduce thermal conductivity of the ceramic without blocking electron transport. These semiconductors could therefore be candidates for environmental friendly oxide thermo‐electrics. However, dense materials are difficult to obtain by conventional sintering from a mixture of TiO 2 and SnO 2 powders due to evaporation of tin oxide. The article presents a novel route to produce, by aqueous co‐precipitation, Ti 0.5 Sn 0.5 O 2 nanopowders as precursors for dense ceramics. The nanostructure developed by spinodal decomposition inside the grains of the as obtained dense Ti 0.5 Sn 0.5 O 2 ceramic is shown to be comparable to that of porous Ti 0.5 Sn 0.5 O 2 ceramic obtained by conventional method.