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Dehydration and rehydration of vermiculites: I. Phlogopitic Mg-vermiculite

Published online by Cambridge University Press:  09 July 2018

H. Graf v. Reichenbach  and
J. Beyer
H. Graf v. Reichenbach
Affiliation:
Institute of Soil Science and SFB 173, University of Hannover, 30419 Hannover, Germany
J. Beyer
Affiliation:
Institute of Soil Science and SFB 173, University of Hannover, 30419 Hannover, Germany
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Abstract

Dehydration and rehydration of a phlogopitic Mg-vermiculite were studied by thermo-analysis (TG, DSC) and in situ X-ray powder diffractometry. A detailed analysis of the relation between temperature and state of hydration of the vermiculite was rendered possible by use of slow heating rates in combination with a fast-recording position-sensitive detector. The results confirm the existence of a number of definite states of hydration characterized by basal spacings of 1.441,1.429,1.376, 1.165, 1.151,1.002 and 0.926 nm, all of which have already been described in the literature. In addition, so far undetected regular 1 : 1 interstratifications have been found. They formed during those transformations which lead to a change in the number of sheets of interlayer water molecules. These structures exhibit integral series of 00l reflections and d(001) spacings of 2.54 and 2.15 nm for the 2 : 1 and 1 : 0 transitions in the ratio of molecular layers of water, respectively.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 3 , September 1994 , pp. 327 - 340
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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