Mechanism of the thermal decomposition of 3CaO·Al2O3·6D2O |
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Authors: | I Proks I Nerád |
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Institution: | (1) Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 5, 809 34 Bratislava, Czechoslovakia |
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Abstract: | The mechanism of the step I and step II of thermal decomposition of 3CaO · Al2O3 · 6D2O was studied. The presence of Ca(OD)2 was proved in the products of the first step of decomposition. In the calorimeter cell of the Dupont 990 thermoanalyser the enthalpy changes H
r,I=59.2kJ/mole D2O for step I (210–410°) andDH
rII,1=69.0 kJ/mole D2O for the first fast part of the step II ( stage 1 of the step I , encompassing the temperature interval 410–560°) were measured. This indicates that the dissociation of Ca(OD)2 is not the only transition taking place in the first fast part (stage 1) of the step II.
Zusammenfassung Der Mechanismus der I und II Stufe der thermischen Zersetzung von 3CaO · Al2O3 · 6D2O wurde untersucht. Die Gegenwart von Ca(OD)2 wurde in den Produkten der ersten Zersetzungsstufe nachgewiesen. In der Kalorimeterzelle des Thermoanalysers Dupont 990 wurde die Enthalpieänderungen H
r,i 59.2 kJ/Mol D2O für Stufe I (210 bis 410°) und H
r,II,I=69.0 kJ/Mol D2O für den ersten schnellen Teil der Stufe II (»Etappe 1 der Stufe II «) im Temperaturbereich von 410 bis 560° gemessen. Dies zeigt, daß die Dissoziation von Ca(OD)2 nicht der einzige Übergang in der ersten, schnellen Phase (Etappe 1) der Stufe II ist.
Résumé On a étudié le mécanisme des deux premières étapes de la décomposition thermique de 3CaO · Al2O3 · 6D2O. La présence de Ca(OD)2 a été mise en évidence dans les produits de la première étape de décomposition. Les variations d'enthalpie correspondant à la première et à la deuxième étape de la décomposition ont été mesurées à l'aide de la cellule calorimétrique du thermoanalyseur Dupont 990; elles s'élèvent respectivement à H
i,I= 59.2 kJ/mole D2O pour l'étape I (210–410°) et H
r,II,1= 69.0 kJ/mole D2O pour la première partie, rapide, de l'étape II («stade l de l'étape II », couvrant l'intervalle 410–560°). Ceci indique que la dissociation de Ca(OD)2 n'est pas la seule transition qui ait lieu dans la première partie (stade 1) de l'étape II.
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![icy](/content/j03x6653h90x9130/xxlarge1080.gif) Ca(OD)2. ![kcy](/content/j03x6653h90x9130/xxlarge1082.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![lcy](/content/j03x6653h90x9130/xxlarge1083.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![rcy](/content/j03x6653h90x9130/xxlarge1088.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![mcy](/content/j03x6653h90x9130/xxlarge1084.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![rcy](/content/j03x6653h90x9130/xxlarge1088.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![chcy](/content/j03x6653h90x9130/xxlarge1095.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![kcy](/content/j03x6653h90x9130/xxlarge1082.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![yacy](/content/j03x6653h90x9130/xxlarge1103.gif) ![chcy](/content/j03x6653h90x9130/xxlarge1095.gif) 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![bcy](/content/j03x6653h90x9130/xxlarge1073.gif) ![ycy](/content/j03x6653h90x9130/xxlarge1099.gif) ![lcy](/content/j03x6653h90x9130/xxlarge1083.gif) Hr,I=59.2 ![kcy](/content/j03x6653h90x9130/xxlarge1082.gif) ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) /![mcy](/content/j03x6653h90x9130/xxlarge1084.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![lcy](/content/j03x6653h90x9130/xxlarge1083.gif) D2O, ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) ![pcy](/content/j03x6653h90x9130/xxlarge1087.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![rcy](/content/j03x6653h90x9130/xxlarge1088.gif) ![vcy](/content/j03x6653h90x9130/xxlarge1074.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![bcy](/content/j03x6653h90x9130/xxlarge1073.gif) ![ycy](/content/j03x6653h90x9130/xxlarge1099.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![rcy](/content/j03x6653h90x9130/xxlarge1088.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![chcy](/content/j03x6653h90x9130/xxlarge1095.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) II (![chcy](/content/j03x6653h90x9130/xxlarge1095.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) 1 ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) II ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) 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![zcy](/content/j03x6653h90x9130/xxlarge1079.gif) ![mcy](/content/j03x6653h90x9130/xxlarge1084.gif) ![ncy](/content/j03x6653h90x9130/xxlarge1085.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![ncy](/content/j03x6653h90x9130/xxlarge1085.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![ecy](/content/j03x6653h90x9130/xxlarge1101.gif) ![ncy](/content/j03x6653h90x9130/xxlarge1085.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![lcy](/content/j03x6653h90x9130/xxlarge1083.gif) ![softcy](/content/j03x6653h90x9130/xxlarge1100.gif) ![pcy](/content/j03x6653h90x9130/xxlarge1087.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![vcy](/content/j03x6653h90x9130/xxlarge1074.gif) ![lcy](/content/j03x6653h90x9130/xxlarge1083.gif) ![yacy](/content/j03x6653h90x9130/xxlarge1103.gif) ![Delta](/content/j03x6653h90x9130/xxlarge916.gif) r,II,I= =69.0 ![kcy](/content/j03x6653h90x9130/xxlarge1082.gif) ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) /![mcy](/content/j03x6653h90x9130/xxlarge1084.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![lcy](/content/j03x6653h90x9130/xxlarge1083.gif) D2O. ![Ecy](/content/j03x6653h90x9130/xxlarge1069.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![ucy](/content/j03x6653h90x9130/xxlarge1091.gif) ![kcy](/content/j03x6653h90x9130/xxlarge1082.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![zcy](/content/j03x6653h90x9130/xxlarge1079.gif) ![ycy](/content/j03x6653h90x9130/xxlarge1099.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![ncy](/content/j03x6653h90x9130/xxlarge1085.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) , ![chcy](/content/j03x6653h90x9130/xxlarge1095.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![tscy](/content/j03x6653h90x9130/xxlarge1094.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![tscy](/content/j03x6653h90x9130/xxlarge1094.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) Ca(OD)2 ![yacy](/content/j03x6653h90x9130/xxlarge1103.gif) ![vcy](/content/j03x6653h90x9130/xxlarge1074.gif) ![lcy](/content/j03x6653h90x9130/xxlarge1083.gif) ![yacy](/content/j03x6653h90x9130/xxlarge1103.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![ncy](/content/j03x6653h90x9130/xxlarge1085.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![ncy](/content/j03x6653h90x9130/xxlarge1085.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![vcy](/content/j03x6653h90x9130/xxlarge1074.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![ncy](/content/j03x6653h90x9130/xxlarge1085.gif) ![ncy](/content/j03x6653h90x9130/xxlarge1085.gif) ![ycy](/content/j03x6653h90x9130/xxlarge1099.gif) ![pcy](/content/j03x6653h90x9130/xxlarge1087.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![rcy](/content/j03x6653h90x9130/xxlarge1088.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![khcy](/content/j03x6653h90x9130/xxlarge1093.gif) ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) , ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![mcy](/content/j03x6653h90x9130/xxlarge1084.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![yucy](/content/j03x6653h90x9130/xxlarge1102.gif) ![shchcy](/content/j03x6653h90x9130/xxlarge1097.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) ![mcy](/content/j03x6653h90x9130/xxlarge1084.gif) ![iecy](/content/j03x6653h90x9130/xxlarge1077.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![pcy](/content/j03x6653h90x9130/xxlarge1087.gif) ![rcy](/content/j03x6653h90x9130/xxlarge1088.gif) ![vcy](/content/j03x6653h90x9130/xxlarge1074.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![bcy](/content/j03x6653h90x9130/xxlarge1073.gif) ![ycy](/content/j03x6653h90x9130/xxlarge1099.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![rcy](/content/j03x6653h90x9130/xxlarge1088.gif) ![ocy](/content/j03x6653h90x9130/xxlarge1086.gif) ![chcy](/content/j03x6653h90x9130/xxlarge1095.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) (![chcy](/content/j03x6653h90x9130/xxlarge1095.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![scy](/content/j03x6653h90x9130/xxlarge1089.gif) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) I) ![tcy](/content/j03x6653h90x9130/xxlarge1090.gif) ![acy](/content/j03x6653h90x9130/xxlarge1072.gif) ![dcy](/content/j03x6653h90x9130/xxlarge1076.gif) ![icy](/content/j03x6653h90x9130/xxlarge1080.gif) II.
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