The reaction of ceria coatings on mica with H2S: An in-situ X-ray diffraction study |
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Authors: | S Bertaux E Schweda |
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Affiliation: | a Merck KGaA, Frankfurter Str. 250, D-64293 Darmstadt, Germany b Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany |
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Abstract: | Thin layers of ceria were deposited on the surface of mica platelets in solution. The reaction of such particles with hydrogen sulfide yields a red colored special effect pigment. The ceria layer reacts with H2S to produce a variety of sulfide and oxysulfide phases. The reaction path discovered in situ by time and temperature resolved X-ray diffraction is CeO2→CeS2→C-Ce2S3→Ce10S14O. The reaction itself is extremely variable depending on gas flow, heating rates and decomposition atmospheres. Effects on the thin film are recorded by scanning electron microscopy (SEM) and revealed a destruction of the layer once red Ce10S14O was formed. The product layer then reveals the typical nonwetting behaviour of a liquid on a surface. |
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Keywords: | A Inorganic compounds A Layered compounds B Chemical synthesis C X-ray diffraction D Optical properties |
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