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Thermal and infrared spectrum analyses of natural and synthetic andersonites

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Abstract

The thermal decompositions of natural and synthetic andersonites were studied. Two partly overlapping dehydration steps and three partly overlapping decarbonation steps were observed. The second dehydration and the first decarbonation steps also partly overlap. During decarbonation, the gradual formation of sodium diuranate and monoclinic and hexagonal phases in the Na2U2O7-CaUO4−x system was proved. The results were correlated with measured infrared spectra using site and factor group analysis and X-ray structure analysis. The chemical formula inferred for natural andersonite, Na2Ca[UO2(CO3)3] ≃ 5.6H2O, agrees with that proposed for its synthetic analogue.

Zusammenfassung

Die thermische Zersetzung von natürlichem und synthetischem Andersonit wurde untersucht. Sie umfasst zwei teilweise überlappende Entwässerungs- und drei teilweise überlappende Decarboxylierungsstufen. Der zweite Entwässerungs- und der erste Decarboxylierungsschritt überlagern einander ebenfalls teilweise. Während der Decarboxylierung wird die allmähliche Bildung von Natriumdiuranat und monoklinen und hexagonalen Phasen des Systems Na2U2C7-CaUO4−x nachgewiesen. Die Ergebnisse wurden mit den gemessenen IR-Spektren unter Benutzung der site- und Faktor-Gruppenanalyse sowie Röntgenbeugungsuntersuchungen korreliert. Die für natürlichen Andersonit abgeleitete Formel Na2Ca[UO2(CO3)3].≈5,6H2O stimmt mit der für synthetischen Andersonit vorgeschlagenen überein.

Резюме

Изучено термическое разложение природно го и синтетического анде рсонита. Установлены два част ично перекрывающихс я процесса дегидратации и три ча стично перекрывающихся про цесса декарбонизаци и. Вторая стадия дегидратации частично также перекрывается с перв ой стадией декарбони зации. Показано, что в процес се декарбонизации происходит постепен ное образование диур аната натрия и моноклинной и гекса гональной фаз в системе Na2U2O7-CaUO4−x. Резуль таты коррелировалис ь с измеренными ИК спект рами и данными рентгенофаз ового анализа. Химиче ская формула Na2Ca[UO2(CO3)3] ≈ 5,6Н2О, пред** ложенная для природн ого андерсонита, согл асуется с предложенной для его синтетического аналога.

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Authors and Affiliations

  1. Natural History Museum, National Museum in Prague, 11579, Prague, Č. S. S. R.

    J. Čejka & Z. Urbanec

  2. Nuclear Research Institute, 25068, Řež near Prague, Č. S. S. R.

    J. Čejka & Z. Urbanec

Authors
  1. J. Čejka
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  2. Z. Urbanec
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Čejka, J., Urbanec, Z. Thermal and infrared spectrum analyses of natural and synthetic andersonites. Journal of Thermal Analysis 33, 389–394 (1988). https://doi.org/10.1007/BF01913912

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  • DOI: https://doi.org/10.1007/BF01913912

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