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DOI: 10.1039/A701540B (Paper) Reference Section for: J. Mater. Chem., 1997, 7, 2113-2116

Preparation and characterization of uniform, spherical particles of Y2O2S and Y2O2S:Eu

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Ligia Delgado da Vila, Elizabeth Berwerth Stucchi and Marian Rosaly Davolos

Abstract

The preparation of spherical Y2O2S and Y2O2S:Eu particles using a solid–gas reaction of monodispersed precursors with elemental sulfur vapor under an argon atmosphere has been investigated. The precursors, undoped and doped yttrium basic carbonates, are synthesized by aging a stock solution containing the respective cation chloride and urea at 82–84 °C. Y2O2S and Y2O2S:Eu were characterized in terms of their composition, crystallinity and morphology by chemical analysis, X-ray powder diffraction (XRD), IR spectroscopy, and scanning electron microscopy (SEM). The Eu-doped oxysulfide was also characterized by atomic absorption spectrophotometry and luminescence spectroscopy. The spherical morphology of oxysulfide products and of basic carbonate precursors suggests a topotatic inter-relationship between both compounds.

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