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A Foaming Esterification Sol–Gel Route for the Synthesis of Magnesia–Yttria Nanocomposites
Author(s) -
Chen ChunHu,
Garofano Jacquelynn K. M.,
Muoto Chigozie K.,
Mercado Andrew L.,
Suib Steven L.,
Aindow Mark,
Gell Maurice,
Jordan Eric H.
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.1551-2916.2010.04343.x
Subject(s) - nanocomposite , materials science , calcination , microstructure , chemical engineering , ethylene glycol , crystallization , citric acid , amorphous solid , thermal decomposition , nanoparticle , hot pressing , magnesium , yttria stabilized zirconia , catalysis , composite material , metallurgy , organic chemistry , chemistry , nanotechnology , ceramic , cubic zirconia , engineering
Nanocomposites of MgO with Y 2 O 3 have been produced from the respective nitrates by an esterification reaction with ethylene glycol and citric acid. The evolution of nitrous oxides during the reaction causes the product to foam, and the calcination of this foam gives nanocomposite powders with extremely fine, uniform grains, and phase domains. These microstructures are remarkably stable both under postcalcination heat treatment and during consolidation by hot pressing. These stable microstructures arise as a result of the decomposition sequence: this involves the formation of a metastable amorphous/vitreous intermediate followed by concurrent crystallization and phase separation on the nanoscale.