Differential scanning calorimetry studies on influence of microstructure on transformation of γ-Fe2O3 to α-Fe2O
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Authors: | A C Vajpei F Mathieu A Rousset F Chassagneux J M Letoffe P Claudy |
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Institution: | (1) Laboratoire de Chimie des Materiaux Inorganiques, Universite Paul Sabatier, 118 Route de Narbonne, F-31062 Toulouse Cedex, France;(2) Laboratoire de Chimie Minerale III, Universite Claude Bernard, 43 Boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France;(3) Laboratoire de Thermochimie Minerale I.N.S.A. U.A. 116, 20 Avenue Albert Einstein, F-69621 Villeurbanne Cedex, France |
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Abstract: | The transition -Fe2O3![rarr](/content/g0340367033t73l4/xxlarge8594.gif) -Fe2O3 has been investigated in oxygen and argon using DSC measurements in the temperature range 298 to 820 K. The results have been interpreted by taking into account the method of preparation, the specific microstructure of the samples and the nature of the gas used. It has been shown that the transformation temperature, and in general the absolute value of the negative enthalpy of the transformation as well, rises with increase of the specific surface area of the -Fe2O3. The observed fluctuations in this trend are attributed to differences in the microporosity, gas sensitivity and crystallinity of the samples.
Zusammenfassung Der Übergang -Fe2O3![rarr](/content/g0340367033t73l4/xxlarge8594.gif) -Fe2O3 in Sauerstoff- und Argonatmosphäre wurde mittels DSC im Temperaturbereich von 298–820 K untersucht. Die Ergebnisse werden unter Berücksichtigung der Präparationsmethode, der spezifischen Mikrostruktur der Proben und der Natur des benutzten Gases interpretiert. Die Phasenumwandlungstemperatur und im allgemeinen die Absolutwerte der negativen Enthalpie der Phasenumwandlung erhöhen bzw. vergrößern sich mit steigender spezifischer Oberfläche des -Fe2O3. Die in diesem Trend auftretenden Fluktuationen werden Unterschieden in der Mikroporosität, der Gasempfindlichkeit und der Kristallinität der Proben zugeschrieben.
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The authors are grateful to Mr. Christian Sarda for his help during the sample preparation and characterization, and to Mr. B. Maachi and Dr. M. Gougeon for their help in surface area measurements. A. C. Vajpei expresses his gratefulness for the award of a Postdoctoral Fellowship in Materials Science by the French Government, made through the Indo-French Scientists' Exchange Programme. Paper presented at the World Conference on Thermal Analysis, Madeira (Portugal), 1986. |
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