A study of the decomposition of praseodymium hydroxy carbonate and PRASEODYMIUM CARBONATE (cas 14948-62-0) hydrate

Add time:07/19/2019    Source:sciencedirect.com

The decomposition reactions of praseodymium hydroxy carbonate and PRASEODYMIUM CARBONATE (cas 14948-62-0) octahydrate have been followed by thermogravimetric analysis, X-ray diffraction analysis of quenched, equilibrated specimens, in situ high temperature X-ray diffraction analysis, and dynamic in situ high-resolution electron microscopic observations. The decomposition reaction sequence for the praseodymium hydroxy carbonate includes the dioxymonocarbonate (three polymorphs) and various oxides depending on the conditions of the experiment. The decomposition reaction sequence for the carbonate hydrate includes a lower hydrate, the anhydrous carbonate, the three polymorphs of the dioxymonocarbonate, and various oxides again depending upon the conditions. The results of the various methods of study are presented and compared. While there is almost a quantitative agreement between the X-ray results, the correlation to the high-resolution electron microscopic results is qualitative. The similarities and differences are discussed. The most striking difference is the much lower temperatures of corresponding decompositions in the microscope.

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