Abstract
The thermal behaviour of strontium hydroxide octahydrate was studied by thermal analysis, an X-ray diffraction technique and optical microscopy. Up to 210° this compound transforms to the hexahydrate and then to the monohydrate. Anhydrous strontium hydroxide crystallizes in the tetragonal system and a polymorphous transformation may occur at 480°. From 530° on it decomposes in three stages. Amorphous strontium oxide is obtained at 700°.
Résumé
On a étudié le comportement thermique de l'hydroxyde de strontium octohydraté par analyse thermique, diffraction de rayons X et examen microscopique. Ce composé donne l'hexahydrate jusqu'à 210° puis le monohydrate. L'hydroxyde de strontium anhydre cristallise dans le système tétragonal et présente une transformation polymorphique à 480°. La déshydroxylation commence à 530° et s'effectue en 3 étapes. L'oxyde de strontium amorphe s'obtient à 700°.
Zusammenfassung
Das thermische Verhalten von Strontiumhydroxyd-Oktahydrat wurde röntgendiffraktometrisch, thermoanalytisch und durch optische Mikroskopie untersucht. Die Verbindung geht bis 210° in das Hexα- und daraufhin ins Monohydrat über. Die Anhydroverbindung kristallisiert tetragonal. Bei 480° erfolgt eine polymorphe Umwandlung. Über 530° verläuft eine Dehydroxylation in drei Stufen. Amorphes Strontiumoxyd wurde bei 700° erhalten.
Резюме
Изучено термическое поведение восьмивод ной гидроокиси стронция методами термического анализ а, рентгенодифракции и оптической микроскопии. Это соед инение до 210° превращается в шест иводную гидроокись, а затем в моногидрат. Безводна я гидроокись стронция кристаллиз уется в тетрагональн ой системе и полиморфное превращ ение может происходить пр и 480°. Его дигидроксили рование начинается при 530° и про ходит в три ступени. Аморфна я окись стронция полу чается при 700°.
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Dinescu, R., Preda, M. Thermal decomposition of strontium hydroxide. Journal of Thermal Analysis 5, 465–473 (1973). https://doi.org/10.1007/BF01950236
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DOI: https://doi.org/10.1007/BF01950236