Thermal properties of potassium dichromate |
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Authors: | G M Clark M Tonks M Tweed |
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Institution: | (1) Department of Chemical Sciences, The Polytechnic, HD1 3DH Queensgate, Huddersfield, UK |
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Abstract: | Thermosonimetry, DTA, high temperature XRD and hot stage microscopy have been used to study the thermal behaviour of K2Cr2O7. A rapid triclinic to monoclinic phase transformation occurs at 543 K slowly reversible at 508 K. Severe crystallite fracturing is associated with the reverse transition and manifests anomalous X-ray intensities which have been previously interpreted as metastable phase formation. On reheating, the transformation occurs at 528 K. Possible interpretations of the temperature hystereses are given.
Zusammenfassung Thermosonimetrie, DTA, Hochtemperatur-XRD und Mikroskopie in heißem Zustand wurden zur Untersuchung des thermischen Verhaltens von K2Cr2O7 eingesetzt. Eine schnelle Phasenänderung von der triklinen zur monoklinen Form findet bei 543 K statt, welche bei 508 K langsam reversibel ist. Der schwere Kristallbruch ist mit dem umgekehrten Übergang verbunden und weist anomale Röntgenstrahlen-Intensitäten auf, welche früher als Bildung einer metastabilen Phase gedeutet wurden. Bei wiederholtem Aufheizen geht die Änderung bei 528 K vor sich. Mögliche Deutungen der Temperaturhysterese werden gegeben.
Résumé On a étudié le comportement thermique de K2Cr2O7 par thermosonimétrie, ATD, diffraction des rayons X à haute température et microscopie avec platina chauffante. Une transformation rapide de la phase triclinique à la phase monoclinique a lieu à 543 K et est lentement réversible à 508 K. Un fractionnement important des cristallites est associé à la transition inverse et se manifeste par des intensités anormales des raies de diffraction X, ce qui a été préalablement interprété comme la formation d'une phase métastable. Lors d'un nouvel échauffement, la transformation a lieu à 528 K. Diverses interprétations possibles de l'hystérèse de température sont proposées.
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![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![kcy](/content/m79257tw301276m5/xxlarge1082.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![bcy](/content/m79257tw301276m5/xxlarge1073.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![zcy](/content/m79257tw301276m5/xxlarge1079.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![vcy](/content/m79257tw301276m5/xxlarge1074.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![icy](/content/m79257tw301276m5/xxlarge1080.gif) ![mcy](/content/m79257tw301276m5/xxlarge1084.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![scy](/content/m79257tw301276m5/xxlarge1089.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![bcy](/content/m79257tw301276m5/xxlarge1073.gif) ![icy](/content/m79257tw301276m5/xxlarge1080.gif) ![lcy](/content/m79257tw301276m5/xxlarge1083.gif) ![softcy](/content/m79257tw301276m5/xxlarge1100.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![fcy](/content/m79257tw301276m5/xxlarge1092.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![zcy](/content/m79257tw301276m5/xxlarge1079.gif) . ![Pcy](/content/m79257tw301276m5/xxlarge1055.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![pcy](/content/m79257tw301276m5/xxlarge1087.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![vcy](/content/m79257tw301276m5/xxlarge1074.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![gcy](/content/m79257tw301276m5/xxlarge1075.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![pcy](/content/m79257tw301276m5/xxlarge1087.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![vcy](/content/m79257tw301276m5/xxlarge1074.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![shchcy](/content/m79257tw301276m5/xxlarge1097.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![icy](/content/m79257tw301276m5/xxlarge1080.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![bcy](/content/m79257tw301276m5/xxlarge1073.gif) ![lcy](/content/m79257tw301276m5/xxlarge1083.gif) ![yucy](/content/m79257tw301276m5/xxlarge1102.gif) ![dcy](/content/m79257tw301276m5/xxlarge1076.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![scy](/content/m79257tw301276m5/xxlarge1089.gif) ![pcy](/content/m79257tw301276m5/xxlarge1087.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) 528 . ![Dcy](/content/m79257tw301276m5/xxlarge1044.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![vcy](/content/m79257tw301276m5/xxlarge1074.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![zcy](/content/m79257tw301276m5/xxlarge1079.gif) ![mcy](/content/m79257tw301276m5/xxlarge1084.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![zhcy](/content/m79257tw301276m5/xxlarge1078.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![icy](/content/m79257tw301276m5/xxlarge1080.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![pcy](/content/m79257tw301276m5/xxlarge1087.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![tscy](/content/m79257tw301276m5/xxlarge1094.gif) ![icy](/content/m79257tw301276m5/xxlarge1080.gif) ![ecy](/content/m79257tw301276m5/xxlarge1101.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![gcy](/content/m79257tw301276m5/xxlarge1075.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![mcy](/content/m79257tw301276m5/xxlarge1084.gif) ![pcy](/content/m79257tw301276m5/xxlarge1087.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![acy](/content/m79257tw301276m5/xxlarge1072.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![ncy](/content/m79257tw301276m5/xxlarge1085.gif) ![ocy](/content/m79257tw301276m5/xxlarge1086.gif) ![gcy](/content/m79257tw301276m5/xxlarge1075.gif) ![gcy](/content/m79257tw301276m5/xxlarge1075.gif) ![icy](/content/m79257tw301276m5/xxlarge1080.gif) ![scy](/content/m79257tw301276m5/xxlarge1089.gif) ![tcy](/content/m79257tw301276m5/xxlarge1090.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![rcy](/content/m79257tw301276m5/xxlarge1088.gif) ![iecy](/content/m79257tw301276m5/xxlarge1077.gif) ![zcy](/content/m79257tw301276m5/xxlarge1079.gif) ![icy](/content/m79257tw301276m5/xxlarge1080.gif) ![scy](/content/m79257tw301276m5/xxlarge1089.gif) .
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