Abstract
Substitution of SiO2 with CeO2 in the ternary sodium borosilicate system was found to produce phase-separable glasses. Heat treatment of these glasses resulted in separation into two different phases. The one phase enriched in sodium borate was then leached out leaving a CeO2-rich framework. The structure of the leached material was crystalline (Pt/Rh crucible melt) which changed to a rather net-like appearance if Al2O3 resulting from erosion of alumina crucibles was added. B2O3 remained partially in the insoluble CeO2-skeleton. X-ray diffraction analysis of leached material proved the presence of crystalline cubic CeO2 and cerium borate (metaborate of the aragonite type) in Pt/Rh crucible melts, whereas cubic CeO2, 2Al2O3 · B2O3 and traces of sodium borate were detected in Al2O3 containing melts. The specific surface areas of the leached materials ranged between 25 and 120m2g−1 while the main radii of interconnected pores were calculated to be between 0.5 and 17nm. A sintering temperature of about 1500° C was estimated from void volume and bulk density measurements.
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