Special
treatment
Special
treatment
1-2 nm
50-100 nm
20 nm
Drying
1 um
Thermal
treating
Figure 7. A generalized scheme of stabilized zirconia nanostructures formation
while preparing it from hydroxides.
Some techniques for controlling the processes of final stabilized zirconia powders
preparation are connected with variations in process-dependent parameters, and some
with the use of specific physical (ultrasound, electromagnetic oscillation) and chemical
(aggregation process blocking compounds) factors to affect the intermediate products
in preparation of nano-sized stabilized zirconia powders.
CONCLUSION
It has been established that scandium (III) precipitates in the same pH range as
that of zirconium (IV), forming with the latter −Zr−OH−Sc− bridging bonds. This is
borne out by formation of polynuclear zirconium and scandium hydroxo complexes of
Zr
1-x
Мe
x
O(OH)
y
.
nН
2
О type during their coprecipitation.
On the basis of concept on zirconium (IV) tetrameric structure in solutions, a
physicochemical model of nanoparticles formation in scandium (III) stabilized zirconia
powders prepared by coprecipitation method has been proposed.
BIBLIOGRAPHICAL REFERENCES
1. V. Vereschak Mechanical and electrophysical properties of electrolyte ceramics
based on zirconia stabilized with Scandia / Vereschak V., Brychevskyi M., Vasylyev
O. // Problems of Chemistry and Chemical Technology. – 2008. – № 2. – P. 135-138.
(in Russian)
2. О.О. Pasenko Thermodynamsc analysis of zirconium hydroxide precipitation
process // Pasenko О.О., Vereshchak V.G., Nikolenko N.V. / Problems of Chemistry
and Chemical Technology. – 2009. – №3. – P.155-157. (in Ukrainian)
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