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Effects of Potassium Removal on the b-Dimension of Phlogopite

Published online by Cambridge University Press:  01 July 2024

R. A. Leonard  and
S. B. Weed
R. A. Leonard*
Affiliation:
Department of Soil Science, North Carolina Agricultural Experiment Station, North Carolina State University, Raleigh, N.C. 27607
S. B. Weed*
Affiliation:
Department of Soil Science, North Carolina Agricultural Experiment Station, North Carolina State University, Raleigh, N.C. 27607
*
†Research Soil Scientist USDA, Watkinsville, Georgia 30677 (formerly Instructor, Department of Soil Science, North Carolina State University, Raleigh North Carolina.
‡Professor of Soils, North Carolina State University Raleigh, North Carolina
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Abstract

Potassium was removed from 5 to 20-μ size fractions of two phlogopites by treatment with sodium tetraphenylboron and replaced with various exchange ions. The b-dimension of the mica increased with K+ removal, which suggests that the K+ ion in phlogopite acts to constrain b. This being the case, the K—O bond in phlogopite must be lengthened and weakened relative to the K—O bond in dioctahedral micas.

Résumé

Résumé

Le potassium a été extrait de fractions de 2 phlogopites mesurant entre 5 et 20 μ par un traitement au tétraphényl-bore de sodium et remplacé par différents ions échangés. La dimension b du mica a augmenté avec l’extraction de K+, ce qui suggère que l’ion de K+ dans le phlogopite limite la dimension b. Dans ce cas la liaison K—O dans le phlogopite doit être allongée et rendue plus faible par rapport à la liaison K—O dans les micas dioctahédriques.

Kurzreferat

Kurzreferat

Aus den Fraktionen in einem Grössenbereich von 5 bis 20 μ zweier Phlogopite wurde durch Behandlung mit Natriumtetraphenylbor das Kalium entfernt und durch verschiedene Austauschionen ersetzt. Die b-Dimension des Glimmers erhöhte sich bei der Entfernung des K+ was darauf hindeutet, dass das K+ Ion im Phlogopit eine b einschränkende Wirkung ausübt. Wenn das der Fall ist, so muss die K-O Bindung in Phlogopit im Vergleich mit der K—O Bindung in dioktaedrischen Glimmern verlängert und geschwächt sein.

Резюме

Резюме

Обработкой натриевым тетрафенилбором фракций от 5 до 20 мк двух образцов флогопита было осуществлено вымывание из них калия с заменой его на различные обменные ионы. С удалением К+ параметр ь слюды увеличивается; это свидетельствует о том, что ионы К+ во флогопите сжимают структуру в направлении оси ь. На этом основании делается вывод о том, что связь К-О во флогопите должна быть длиннее и слабее, чем в диоктаэдрических слюдах.

Type
Research Article
Information
Clays and Clay Minerals , Volume 18 , Issue 4 , November 1970 , pp. 197 - 202
Copyright
Copyright © 1970 The Clay Minerals Society

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Footnotes

*

Published with the approval of the Director as Paper No. 2962 of the Journal Series.

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