Chemical gelation of cerium (III)-doped yttrium aluminium oxide spherical particles

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)2510-2515
Journal / PublicationJournal of Materials Research
Volume21
Issue number10
Publication statusPublished - Oct 2006
Externally publishedYes

Abstract

A novel low-temperature (900 °C) chemical gelation method was developed to synthesize spherical and nonagglomerated Ce3+-doped yttrium aluminum oxide particles (YAG:Ce3+). This represents a process with a much lower processing temperature than current solid-state reaction processes (1400 °C). Characterization of the particles via x-ray diffraction and thermoanalytical methods showed that calcination at 900 °C for 2 h allowed direct crystallization from the amorphous phase, inferring that this process allows homogeneous mixing and increased precursor reactivity. Electron microscopy results showed that the spherical particles (∼100 to ∼3 μm) were the flocks of crystallites. The crystallite sizes (Rietveld refinement) grew linearly from 27 nm (900 °C) to 114 nm (1300 °C). The surface area decreased from 40 m2/g (900 °C) to 5 m2/g (1300 °C) because of the coagulating and growing of crystallites to bigger grains at 1300 °C. Single-crystal nanoparticles (around 100 nm) were obtained with this process and their atomic structures were revealed via high-resolution transmission electron microscopy. © 2006 Materials Research Society.

Citation Format(s)

Chemical gelation of cerium (III)-doped yttrium aluminium oxide spherical particles. / Su, L. T.; Tok, A. I. Y.; Boey, F. Y. C. et al.
In: Journal of Materials Research, Vol. 21, No. 10, 10.2006, p. 2510-2515.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review