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Kinetics of dehydration and thermal decomposition of Sr(NO3)2.4H2O and its deuterated analogue with a view to obtaining SrO

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Abstract

The kinetics and mechanism of thermal dehydration of Sr(NO3)2.4H2O and its deuterated analogue were studied by means of DTA, TG and DSC. The temperatures, enthalpies and weight losses of phase transitions were measured. The dehydration occurs in a stepwise manner, and the composition of the intermediate depends on the rate of thermal decomposition. The kinetic parameters (E * andZ) for the two steps of dehydration at a heating rate of 5 deg min−1 were calculated. A correlation was found between the dispersity of the end-product of the thermal decomposition (SrO) and the conditions of its preparation.

Zusammenfassung

Kinetik und Mechanismus der thermischen Entwässerung von Sr(NO3)2.4H2O und der deuterierten Verbindung Sr(NO3)2.4D2O wurden mittels TG-DTA und DSC untersucht. Temperaturen, Enthalpien und Gewichtsverluste der Phasenumwandlungen wurden gemessen. Der Prozess verläuft stufenweise, die Zusammensetzung des Zwischenprodukts hängt von der Zersetzungsgeschwindigkeit ab. Die kinetischen ParameterE * undZ der beiden Entwässerungsstufen bei einer Aufheizgeschwindigkeit von 5 Grad min−1 wurden berechnet. Zwischen der Dispersität des Endproduktes SrO und seinen Bildungsbedingungen wurde eine Korrelation gefunden.

Резюме

Методом ТГ, ДТА и ДСК из учена кинетика и механизм термическо й дегидратации тетрагидрата нитрат а стронция и его дейте рированного аналога. Измерены тем пературы и энтальпии фазовых пе реходов. Процесс деги дратации протекает ступенчат о, а состав образующегося проме жуточного продукта з ависит от скорости термическо го разложения. Для двух стадий дегидрат ации, проведенных при скорости нагрева 5 К/мин, были выч ислены кинетические параме тры E и Z. Установлена ко рреляция между дисперсностью конечного продукта разложения оксидом стронция и ус ловиями его получения.

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Authors and Affiliations

  1. Higher Institute of Chemical Technology, 1156, Sofia, Bulgaria

    M. Maneva & N. Petroff

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  1. M. Maneva
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  2. N. Petroff
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Maneva, M., Petroff, N. Kinetics of dehydration and thermal decomposition of Sr(NO3)2.4H2O and its deuterated analogue with a view to obtaining SrO. Journal of Thermal Analysis 33, 447–454 (1988). https://doi.org/10.1007/BF01913922

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  • DOI: https://doi.org/10.1007/BF01913922

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