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Reactive crystallization with supercritical carbon dioxide

: Ehrenstein, U.; Weber, A.; Tschernjaew, J.; Kümmel, R.

Poliakoff, M. ; Institut National Polytechnique de Lorraine, Nancy; International Society for the Advancement of Supercritical Fluids:
6th Meeting on Supercritical Fluids. Chemistry and Materials 1999. Proceedings : 10 - 13 April 1999, Nottingham (United Kingdom)
Vandoeuvre: INPL, 1999
ISBN: 2-905267-30-5
Meeting on Supercritical Fluids <6, 1999, Nottingham>
Fraunhofer UMSICHT Oberhausen ()
Acetat; Hochtemperatursupraleiter; Kohlendioxid; Kristallisation; Nanopartikel; Reaktion; überkritisches Fluid; acetate; high temperature super conductor; carbon dioxide; crystallisation; nanoparticle; reaction; supercritical fluid (SCF)

The production of high quality ceramics requires precursors with a high chemical homogeneity. In the field of crystallization with compressed fluids especially the PCA process (Precipitation with Compressed Antisolvents) is capable of meeting the demands. This process is based on the dispersion of a primary solution (solvent and dissolved solids) via a nozzle into a compressed antisolvent. Because of the high solubility of the compressed antisolvent in the primary solvent high supersaturations are reached leading to small and nearly monodisperse solids. It is also possible to precipitate two or more components simultaneously. The resulting microcomposites show a high chemical homogeneity and a small particle size, what infers a good sinterability of the products.