Preparation and characterization of uniform, spherical particles of Y2O2S and Y2O2S:Eu
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1997-10-01
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Delgado Da Vila, Ligia [UNESP]
Stucchi, Elizabeth Berwerth [UNESP]
Davolos, Marian Rosaly [UNESP]
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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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Journal of Materials Chemistry, v. 7, n. 10, p. 2113-2116, 1997.