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

Published online by Cambridge University Press:  03 March 2011

L.T. Su ,
A.I.Y. Tok ,
F.Y.C. Boey  and
J.L. Woodhead
L.T. Su
Affiliation:
School of Materials Science and Engineering, Nanyang Technology University, Singapore 639798
A.I.Y. Tok*
Affiliation:
School of Materials Science and Engineering, Nanyang Technology University, Singapore 639798
F.Y.C. Boey
Affiliation:
School of Materials Science and Engineering, Nanyang Technology University, Singapore 639798
J.L. Woodhead
Affiliation:
Advanced Material Resources (Europe) Ltd., Abingdon, United Kingdom, OX14 3YS
*
a) Address all correspondence to this author. e-mail: miytok@ntu.edu.sg
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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.

Keywords

Chemical synthesisCrystal growthOxide
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 10 , October 2006 , pp. 2510 - 2515
Copyright
Copyright © Materials Research Society 2006

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