Sol-gel synthesis of tunable cerium titanate materials
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Other documents of the author: Martos Macián, Mónica; Julian-Lopez, Beatriz; Folgado, José Vicente; Cordoncillo, Eloisa; Escribano López, Purificación
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comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
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Title
Sol-gel synthesis of tunable cerium titanate materialsAuthor (s)
Date
2008Publisher
ChemPubSoc EuropeISSN
14341948Type
info:eu-repo/semantics/articleSubject
Abstract
Cerium titanate structures present a high technological interest
because of their optical and catalytic properties. This work reports
the synthesis of these materials by a sol-gel methodology which
allows to obtain ... [+]
Cerium titanate structures present a high technological interest
because of their optical and catalytic properties. This work reports
the synthesis of these materials by a sol-gel methodology which
allows to obtain mixed oxides with Ti(IV)/Ce(III), Ti(IV)/Ce(IV) or
Ti(IV)/Ce(III)-Ce(IV) species. Crystallization of CeO2-TiO2 mixed
oxides and Ce2Ti2O7 pyrochlore phase has been corroborated by
XRD and Raman spectroscopy. Magnetic and EPR measurements
have been performed in order to clarify the oxidation state of
cerium ions in the system, due to the easy oxidation of Ce(III). The firing atmosphere is crucial for the Ce(III)/Ce(IV) ratio
which is responsible for the different structure, also affecting to
the coloration (yellow, green, brown). This methodology offers
the possibility to modulate the Ce3+/Ce4+ content and particle
sizes providing more ecological coloured pigments based on rare
earth elements which could be interesting materials for advanced
applications in catalysis [-]
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info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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