Phase evolution of sol-gel CaO-ZrO2 using sulfuric acid as hydrolysis catalyst View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2006-02-24

AUTHORS

J. García, P. Quintana, D. H. Aguilar, T. López, R. Gómez

ABSTRACT

Several compositions in the CaO-ZrO2 system were synthesized from zirconium n-butoxide and calcium methoxide, by the sol-gel method. Hydrolysis and gelation occurred at pH 3, using H2SO4 as hydrolysis catalyst. Fresh gels were annealed in air at 100 to 900°C, in 100°C steps every 20 h, for a total annealing time of 140 h. Analysis by X-ray diffraction showed the formation of hydrated calcium sulfate together with amorphous zirconia up to 400°C. At the ZrO2 rich-end, tetragonal and monoclinic zirconia solid solutions were stabilized in the presence of Ca ions. When 20 and 30 wt% of CaO were added, cubic zirconia and CaZrO3 solid solutions were observed above 700°C. At the CaO rich-end, the coexistence of calcium carbonate polymorphs as vaterite and calcite were observed. Anhydrite was present across the entire range of compositions studied from 300 to 900°C. More... »

PAGES

185-188

References to SciGraph publications

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URI

http://scigraph.springernature.com/pub.10.1007/s10971-005-6626-x

DOI

http://dx.doi.org/10.1007/s10971-005-6626-x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1036733105


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