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Hydration states of an expanded phlogopite in relation to interlayer cations

Published online by Cambridge University Press:  09 July 2018

T. D. Thompson ,
Sally A. Wentworth  and
G. W. Brindley
T. D. Thompson
Affiliation:
Department of Geochemistry and Mineralogy, The Pennsylvania State University, University Park, Pa.
Sally A. Wentworth
Affiliation:
Department of Geochemistry and Mineralogy, The Pennsylvania State University, University Park, Pa.
G. W. Brindley
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pa.
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Abstract

A 2–20 µ fraction of phlogopite has been converted to the sodium form by use of sodium tetraphenylboron-NaCl solutions. The cation exchange capacity of the treated material increases to a maximum of about 212 m-eq/100 g, which agrees well with the K2O + Na2O content of the initial mineral. Li-, Na-, Ca-, and Mg-saturated forms have been prepared and examined by X-ray diffraction and by thernogravimetric measurements in air, in vacuo, and at progressively elevated temperatures. Hydration states corresponding to double water layers are observed for the Mg- and Ca- forms, and to single water layers for the Mg-, Ca-, Na-, and Li- forms. The numbers of water molecules per unit cell and per interlayer cation are considered for the various hydration states.

Type
Research Article
Information
Clay Minerals , Volume 7 , Issue 1 , July 1967 , pp. 43 - 49
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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