A study of the kinetics of the phase transition aragonite → calcite by dilatometric thermal analysis |
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Authors: | N D Topor L I Tolokonnikova B M Kadenatsi |
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Institution: | (1) Department of Mineralogy, Lomonosov State University, Moscow;(2) Institute of Chemical Physics of the Academy of Sciences of the U. S. S. R., USSR |
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Abstract: | The first-order phase transition in the system aragonite-calcite (CaCO3) was studied with natural and synthetic aragonites. The studies were carried out by dilatometry on a derivatograph, under non-isothermal conditions. It was found that the polymorphic transformation of aragonites into calcite is described by the Avrami equationl=1 — exp (-kt
n
), with the exponentn having a value close to 1. The activation energy values found for the aragonites studied were 184– 205 kJ/mol, while the values of the pre-exponential factorz were 1014-1012 s–1 in the conversion rangel=0.10–0.66.
Zusammenfassung Der Phasenübergang erster Ordnung wurde im System Aragonit-Kalzit (CaCO3) an natürlichen und synthetischen anorganischen Aragoniten untersucht. Die Untersuchungen wurden durch Dilatometrie in einem Derivatographen unter nicht-isothermen Bedingungen durchgeführt. Es wurde festgestellt, daß die polymorphe Umwandlung der Aragonite zu Kalziten durch die Avrami-Gleichungl=1 – exp (–kt
n
) beschrieben wird, wobei der Exponentn einen Wert in der Nähe von 1 hat. Die für die untersuchten Aragonite gefundenen Werte der Aktivierungsenergie waren 185 ... 207 kJ/Mol, die Werte des präexponentiellen Faktorsz betrugen 1014 ... 1012 s–1 im Konversionsbereichl=0.10...0.66.
Résumé On a étudié la transition de phases du premier ordre qui a lieu dans le système aragonite-calcite (CaCO3) dans des aragonites minérales, naturelles et synthétiques. Les études ont été effectuées par dilatométrie dans un dérivatographe en conditions non-isothermes. On a trouvé que la transformation polymorphe des aragonites en calcite est décrite par l'équation d'Avramil=- exp (-kt
n
), l'exposantn étant proche de 1. Les valeurs des énergies d'activation trouvées pour les aragonites étudiées se sont élevées à 185 ... 207 kJ/mole, les valeurs du facteur pré-exponentielz à 1014... 1012 s–1, dans l'intervalle de conversionl= =0.10 ... 0.66.
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![dcy](/content/g624w60461647188/xxlarge1076.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![tscy](/content/g624w60461647188/xxlarge1094.gif) . ![Dcy](/content/g624w60461647188/xxlarge1044.gif) ![lcy](/content/g624w60461647188/xxlarge1083.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![scy](/content/g624w60461647188/xxlarge1089.gif) ![scy](/content/g624w60461647188/xxlarge1089.gif) ![lcy](/content/g624w60461647188/xxlarge1083.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![dcy](/content/g624w60461647188/xxlarge1076.gif) ![ucy](/content/g624w60461647188/xxlarge1091.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![mcy](/content/g624w60461647188/xxlarge1084.gif) ![ycy](/content/g624w60461647188/xxlarge1099.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![rcy](/content/g624w60461647188/xxlarge1088.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![gcy](/content/g624w60461647188/xxlarge1075.gif) ![ocy](/content/g624w60461647188/xxlarge1086.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![tcy](/content/g624w60461647188/xxlarge1090.gif) ![ocy](/content/g624w60461647188/xxlarge1086.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![jcy](/content/g624w60461647188/xxlarge1081.gif) ![dcy](/content/g624w60461647188/xxlarge1076.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![ycy](/content/g624w60461647188/xxlarge1099.gif) ![zcy](/content/g624w60461647188/xxlarge1079.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![chcy](/content/g624w60461647188/xxlarge1095.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![rcy](/content/g624w60461647188/xxlarge1088.gif) ![gcy](/content/g624w60461647188/xxlarge1075.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![kcy](/content/g624w60461647188/xxlarge1082.gif) ![tcy](/content/g624w60461647188/xxlarge1090.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![vcy](/content/g624w60461647188/xxlarge1074.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![tscy](/content/g624w60461647188/xxlarge1094.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![scy](/content/g624w60461647188/xxlarge1089.gif) ![ocy](/content/g624w60461647188/xxlarge1086.gif) ![scy](/content/g624w60461647188/xxlarge1089.gif) ![tcy](/content/g624w60461647188/xxlarge1090.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![vcy](/content/g624w60461647188/xxlarge1074.gif) ![lcy](/content/g624w60461647188/xxlarge1083.gif) ![yacy](/content/g624w60461647188/xxlarge1103.gif) ![yucy](/content/g624w60461647188/xxlarge1102.gif) 184–205 ![kcy](/content/g624w60461647188/xxlarge1082.gif) ![dcy](/content/g624w60461647188/xxlarge1076.gif) /![mcy](/content/g624w60461647188/xxlarge1084.gif) ![ocy](/content/g624w60461647188/xxlarge1086.gif) , ![zcy](/content/g624w60461647188/xxlarge1079.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![chcy](/content/g624w60461647188/xxlarge1095.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![pcy](/content/g624w60461647188/xxlarge1087.gif) ![rcy](/content/g624w60461647188/xxlarge1088.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![dcy](/content/g624w60461647188/xxlarge1076.gif) ![ecy](/content/g624w60461647188/xxlarge1101.gif) ![kcy](/content/g624w60461647188/xxlarge1082.gif) ![scy](/content/g624w60461647188/xxlarge1089.gif) ![pcy](/content/g624w60461647188/xxlarge1087.gif) ![ocy](/content/g624w60461647188/xxlarge1086.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![tscy](/content/g624w60461647188/xxlarge1094.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![acy](/content/g624w60461647188/xxlarge1072.gif) ![lcy](/content/g624w60461647188/xxlarge1083.gif) ![softcy](/content/g624w60461647188/xxlarge1100.gif) ![ycy](/content/g624w60461647188/xxlarge1099.gif) ![mcy](/content/g624w60461647188/xxlarge1084.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![ocy](/content/g624w60461647188/xxlarge1086.gif) ![zhcy](/content/g624w60461647188/xxlarge1078.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) ![tcy](/content/g624w60461647188/xxlarge1090.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![lcy](/content/g624w60461647188/xxlarge1083.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) =1014-1012 cek–1 ![dcy](/content/g624w60461647188/xxlarge1076.gif) ![lcy](/content/g624w60461647188/xxlarge1083.gif) ![scy](/content/g624w60461647188/xxlarge1089.gif) ![tcy](/content/g624w60461647188/xxlarge1090.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![pcy](/content/g624w60461647188/xxlarge1087.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![pcy](/content/g624w60461647188/xxlarge1087.gif) ![rcy](/content/g624w60461647188/xxlarge1088.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![vcy](/content/g624w60461647188/xxlarge1074.gif) ![rcy](/content/g624w60461647188/xxlarge1088.gif) ![shchcy](/content/g624w60461647188/xxlarge1097.gif) ![iecy](/content/g624w60461647188/xxlarge1077.gif) ![ncy](/content/g624w60461647188/xxlarge1085.gif) ![icy](/content/g624w60461647188/xxlarge1080.gif) l=0.10–0.66.
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