Abstract
Thermal decomposition processes of rare earth sesquisulfides Ln2S3 (Ln= Lu, Y and Er) in O2 flow up to 1590 K, have been studied. Decomposition takes place through incomplete oxidations and overlapping decomposition reactions. Two intermediate phases such as Ln2O2S and Ln2O2SO4 are formed before the final more stable phase Ln2O3 (C-type) is obtained. Microstructural studies show the poor crystallinity of the intermediate products.
Zusammenfassung
Im Sauerstoffstrom wurden bis zu einer Temperatur von 1590 K die thermischen Zersetzungsprozesse der Seltenerdensesquisulfide Ln2S3 (mit Ln = Lu, Y und Er) untersucht. Die Zersetzung läuft über unvollständige Oxidationsprozesse und überlappende Zersetzungsreaktionen ab. Vor der Bildung des Endproduktes Ln2O3 (C-Typ) werden die zwei weniger stabilen Intermediärphasen Ln2O2S und Ln2O2SO4 gebildet. Eine Untersuchung der Mikrostruktur erwies die reine Kristallinität der intermediären Phasen.
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We wish to thank the Centro de Microscopia Electrónica, U.C.M.) for facilities. This research was supported by the CYCIT project MAT 89-0768.
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Rojas, R.M., Torralvo, M.J. & Otero-Diaz, L.C. Thermal behaviour and microstructural characterization of lanthanide sulphides. Journal of Thermal Analysis 38, 961–971 (1992). https://doi.org/10.1007/BF01979429
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DOI: https://doi.org/10.1007/BF01979429