Significance of structural factors in dehydroxylation of kaolinite polytypes |
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Authors: | L Stoch |
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Institution: | (1) Institute of building materials and refractories, Academy of mining and metallurgy, 30-059 Cracow, Poland |
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Abstract: | The relations between the perfection of the structure, the size of the crystals and the course of dehydroxylation of kaolinite polytypes, as revealed by DTA and DTG curves, are discussed. The dehydroxylation of kaolinites is a peculiar type of homogeneous, intracrystal thermal dissociation. The kinetics of this process are dependent on the rate of removal of water vapour from the structure and its pressure in the structural domains.
Zusammenfassung Beziehungen zwischen dem Ordnungsgrad der Struktur, der Kristallgrö\e und dem durch DTA und DTG verfolgten Verlauf der Dehydroxylierung von Kaolinit-Polytypen werden diskutiert. Die Dehydroxylierung von Kaolinit ist ein besonderer Typ einer homogenen, intrakristallinen thermischen Dissoziation. Die Kinetik dieses Prozesses ist von der Geschwindigkeit der Entfernung des Wasserdampfes aus der Struktur der Probe, also vom Wasserdampfpartialdruck in der Probe abhÄngig.
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