Synthesis and thermal decomposition of some rare earth tetramethylammonium double sulphates |
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| Authors: | V Jordanovska J Šiftar |
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| Institution: | (1) Institute of Chemistry, University of Skopje, 91000 Skopje, Macedonia;(2) Department of Chemistry, University of Ljubljana, 61000 Ljubljana, Slovenia |
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| Abstract: | When reaction mixtures of rare earth(III) sulphates and tetramethylammonium sulphate in molar ratios of from 1∶4 to 1∶12 were evaporated at ambient temperature and the concentrated reaction mixture was treated with ethanol, double sulphates with general empirical formula (CH3)4NLn(SO4)2·2H2O (Ln=Ho?Lu and Y) were obtained as reaction products. The crystalline products were identified by quantitative analysis, X-ray powder diffraction patterns and TG, DTG and DTA analysis. They were found to be isostructural. Their thermal decomposition took place in three stages. The temperature range of the dehydration mainly decreased from Ho to Lu. The thermal decomposition in the second and third stages occurred with many thermal events. As final product, Ln2O(SO4)2 was obtained. |
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| Keywords: | rare earth tetramethylammonium double sulphates TG-DTG-DTA X-ray |
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