Differential scanning calorimetry studies on aged iron(III)-chromium(III)-hydroxide coprecipitates |
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Authors: | X. Devaux A. C. Vajpei A. Rousset A. Rocher M. Brieu Uma Kailash Chandra I. P. Saraswat |
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Affiliation: | (1) Laboratoire de Chimie des Materiaux Inorganiques C.N.R.S. - U.R.A. 1311, Universite Paul Sabatier, 118, Route de Narbonne, 31062 Toulouse-Cedex, France;(2) Laboratoire D'optique Electronique du C.N.R.S. 29, Rue Jeanne-Marvig, 31055 Toulouse-Cedex, France;(3) Department of Chemistry, University of Roorkee, 247667 Roorkee, India |
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Abstract: | DSC measurements in air from 20 to 800° are reported on aged iron(III)-chromium(III) coprecipitated hydroxides (with Fe3+ Cr3+ wt% ratios of 9 1, 7 3, 1 1, 3 7 and 1 9). A comparison of the DSC profiles of aged coprecipitates with the thermal behaviour of freshly precipitated and well characterized samples provided information on the modification occurring in the structure and reactivity of the coprecipitates on prolonged aging.
Zusammenfassung Es werden DSC-Messungen an gealterten kogefällten Eisen(III)Chrom(III)-hydroxiden (mit Fe3+ Cr3+ Gewichtsanteilen von 9 1, 7 3, 1 1, 3 7 und 1 9) im Temperaturbereich von 20 bis 800° beschrieben. Ein Vergleich der DSC-Profile von gealterten Kofällungen mit dem thermischen Verhalten frisch gefällter und gut definierbarer Proben lieferte Informationen über die Veränderungen in Struktur und Reaktivität der Koniederschläge bei längerem Altern.
Dedicated to Professor Wahid U. Malik, Founder-President, Indian Council of Chemists, India, with profound regards and fond memories of his youthful enthusiasm and ceaseless and pioneering efforts towards the development of chemical education and research activities at the University of Roorkee, Roorkee, India, on the occasion of his 70th birthday. Paper presented at the World Conference on Thermal Analysis, Capri (Italy), 1989. We thank Professor J. Pescia, Dr.G. Ablart and N. Favillier of Laboratoire de Magnétisme et d'Electronique Quantique for their interest in this work. A. C. Vajpei expresses his gratefulness to C.N.R.S. and C.N.O.U.S., Paris, for financial support of this work. |
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