Studies on lanthanoid sulphites: V. thermal decomposition of cerium and neodymium sulphites |
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| Authors: | M Leskelä JEX De Matos L Niinistö |
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| Institution: | Department of Chemistry, Helsinki University of Technology, SF-02150 Espoo 15 Finland |
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| Abstract: | The preparation and thermal behaviour of Ce2(SO3)3· 3H2O, Nd2(SO3)3·6H2O and Nd2(SO3)3 have been studied. Cerium sulphite undergoes first dehydration which is followed by decomposition to CeO2 in the temperature range 500 – 850 °C. The decomposition involves two intermediate phases both in air and nitrogen. According to the TG curves the phases in air are Ce2(SO3)2SO4 and Ce2SO3(SO4)2. In nitrogen, Ce2O2SO4 was identified and this provides a synthetic route to cerium oxysulphate.Neodymium sulphite decomposes to Nd2O2SO4 when heated in air or in nitrogen up to 950°C. The intermediate levels observed do not correspond to single phases, and the reaction mechanism depends strongly on the experimental conditions. |
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| Keywords: | Permanent addresses: Department of Chemistry University of Oulu SF-90570 Oulu 57 Finland |
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