Application of DTA for investigation of hydration and dehydration of crystal hydrates |
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Authors: | Z A Konstant A J Vaivad |
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Institution: | (1) Institute of Inorganic Chemistry, Academy of Sciences of Latvian SSR, SSR |
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Abstract: | The results of the investigation of the hydration processes of the dehydration products of magnesium carbonate trihydrate are shown. The DTA curve was used to calculate the functionQ(t). It was found that the results were in good agreement with the equation
, whereQ is the heat evolved during the hydration timet;Q
0,Q
f are the same for the initial and final products, respectively,k
1 andk
2 are the hydration constants.
Zusammenfassung Die benutzte Methode wurde am Beispiel der Untersuchung des Hydrationsvorganges der Dehydratisierungsprodukte des Magnesiumkarbonat-Trihydrats demonstriert. Zur Errechnung der FunktionQ(t) dienten die DTA-Kurven. Die Ergebnisse folgten gut der Gleichung
, woQ die freigesetzte Wärme während der Hydratationszeitt, Q
0,Q
f dieselbe für die Anfangs- und Endprodukte,k
1,k
2 die Hydratationskonstanten bedeuten.
Résumé Pour illustrer la méthode employée, on communique les résultats se rapportant à l'étude du phénomène d'hydration des produits de déshydratation du carbonate de magnésium trihydraté. On calcule la fonctionQ(t) à l'aide des courbes d'A.T.D. Les résultats obtenus sont en bon accord avec les valeurs de l'équation
oùQ est la chaleur dégagée pendant le temps d'hydratationt, Q
0 etQ
f sont les valeurs correspondantes pour les produits initiaux et finals,k
1 etk
2 les constantes d'hydratation.
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0 Q
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1 k
2 — ![pcy](/content/m61u082954610836/xxlarge1087.gif) ![ocy](/content/m61u082954610836/xxlarge1086.gif) ![tcy](/content/m61u082954610836/xxlarge1090.gif) ![ocy](/content/m61u082954610836/xxlarge1086.gif) ![yacy](/content/m61u082954610836/xxlarge1103.gif) ![ncy](/content/m61u082954610836/xxlarge1085.gif) ![ncy](/content/m61u082954610836/xxlarge1085.gif) ![ycy](/content/m61u082954610836/xxlarge1099.gif) ![gcy](/content/m61u082954610836/xxlarge1075.gif) ![icy](/content/m61u082954610836/xxlarge1080.gif) ![dcy](/content/m61u082954610836/xxlarge1076.gif) ![rcy](/content/m61u082954610836/xxlarge1088.gif) ![acy](/content/m61u082954610836/xxlarge1072.gif) ![tcy](/content/m61u082954610836/xxlarge1090.gif) ![acy](/content/m61u082954610836/xxlarge1072.gif) ![tscy](/content/m61u082954610836/xxlarge1094.gif) ![icy](/content/m61u082954610836/xxlarge1080.gif) .
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