Investigation about methods of quantitative evaluation of DTA curves |
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Authors: | H Anderson W Besch D Haberland |
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Institution: | (1) Section of Chemistry of the Ernst Moritz Arndt University, Greifswald, 22 Greifswald, GDR |
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Abstract: | The investigation gives a comparison of the best-known kinetic evaluation methods for DTA curves. With regard to accuracy and error-compensation, the methods of Borchardt and Daniels, Coats and Redfern and atava and kvara in particular are to be recommended if simple irreversible reactions are to be evaluated on the basis of homogeneous kinetics. The complete exponential integral method is described which totally eliminates the approximative character of the practical procedure of Coats and Redfern. Hence, it becomes theoretically exact again.
Zusammenfassung Die Untersuchung beschäftigt sich mit dem Vergleich der bekanntesten kinetischen Auswerteverfahren für DTA-Kurven. Unter Beachtung der Genauigkeit und des Fehlerausgleiches wird festgestellt, daß die Methoden von Borchardt und Daniels, Coats und Redfern sowie atava und kvara besonders empfehlenswert sind, wenn man einfache irreversible Reaktionen auf der Grundlage der Homogenkinetik auswerten will. — Im zweiten Teil wird die Methode des vollständigen Exponentialintegrals beschrieben, die den Näherungscharakter in dem praktikablen Verfahren von Coats und Redfern aufhebt. Dadurch wird es wieder theoretisch exakt.
Résumé L'étude porte sur la comparison des méthodes les plus connues d'exploitation cinétique des courbes ATD. Du point de vue de l'exactitude et de la compensation des erreurs, on établit que les méthodes de Borchardt et Daniels, de Coats et Redfern ainsi que de atava et kvara peuvent être recommandées pour l'étude des réactions irréversibles simples en cinétique homogène. Dans la seconde partie, on décrit la méthode d'intégration exponentielle complète qui supprime totalement le caractère approximatif de la méthode de Coats et Redfern.
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