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Examination of phase eouilibrium of the Ca(NO3)2-H2O system with quasi-isothermal-quasi-isobaric thermogravimetry and DTA

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Abstract

By means of the quasi-isothermal-quasi-isobaric thermogravimetry (Q-TG) technique ideal experimental conditions can be realized. This provides a possibility to compare the measured data with data from other phase equilibrium (solubility, tension) examinations.

On the example of the Ca(NO3)2-H2O system it is demonstrated that the phase diagrams can be used to interpret thermoanalytical (especially Q-TG) curves, or conversely, the results of thermoanalytical (Q-TG, DTA) examinations can serve for the control of equilibrium data of phase diagrams or to supply missing data.

Zusammenfassung

Mit Hilfe des quasi-isothermischen-quasi-isobaren thermogravimetrischen (Q-TG) Verfahrens können ideale Versuchsbedingungen realisiert werden. Das ermöglicht es, die gemessenen Daten mit von anderen Phasengleichgewicht-Untersuchungen (Lösbarkeit, Tension) stammenden Daten zu vergleichen.

Durch das Beispiel des Ca(NO3)2-H2O-Systems wurde es gezeigt, dass die Phasendiagramme zur Erklärung von thermoanalytischen (insbesondere Q-TG) Kurven können angewandt werden, oder umgekehrt, die Ergebnisse der thermoanalytischen (Q-TG, DTA) Untersuchungen als Kontrolle der Gleichgewichtsdaten der Phasendiagramme dienen können, oder die fehlenden Daten liefern können.

Резюме

С помощью квазиизотермическо го-квазиизобарного т ермогравиметри термогравиметричес кого метода (Q-ТГ) могут быть реализованы идеальн ые экспериментальные у словия. Этим самым представляетс я возможность сопост авлять измеряемые данные с д анными других фазовых равновесий (р астворимость, упруго сть). На примере системы Ca(NO3)2-H2O было показано, что фаз овая диаграмма может быть использована для инт ерпретации термоана литических (особенно Q-ТГ) кривых ил и наоборот, результат ы термоаналитических исследований могут с лужить для контроля р авновесных данных фазовых диагр амм или при использовании не достающих данных.

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References

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Authors and Affiliations

  1. Institute for General and Analytical Chemistry, Technical University, Budapest, Hungary

    F. Paulik, J. Paulik & M. Arnold

Authors
  1. F. Paulik
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  2. J. Paulik
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  3. M. Arnold
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Additional information

The authors are indebted to Prof. E. Pungor for valuable discussions, and thank Mrs. M. Kiss and Miss I. Fábián for their technical assistance.

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Paulik, F., Paulik, J. & Arnold, M. Examination of phase eouilibrium of the Ca(NO3)2-H2O system with quasi-isothermal-quasi-isobaric thermogravimetry and DTA. Journal of Thermal Analysis 27, 419–426 (1983). https://doi.org/10.1007/BF01914679

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  • DOI: https://doi.org/10.1007/BF01914679

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