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Effects of tetrahedral isomorphic substitution on the IR spectra of synthetic fluorine micas

Published online by Cambridge University Press:  09 July 2018

K. Kitajima  and
N. Takusagawa
K. Kitajima
Affiliation:
Faculty of Engineering, Shinshu University, Wakasato, Nagano 380, Japan
N. Takusagawa
Affiliation:
Faculty of Engineering, Shinshu University, Wakasato, Nagano 380, Japan
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Abstract

Effects of tetrahedral isomorphic substitution on the IR spectra of fluorine micas were demonstrated by comparing the spectrum of taeniolite KMg2Li(Si4O10)F2 with those of the substituted analogues, in which Ga, Al, B or Ge substituted for Si in tetrahedral sites. The e11 bands move towards lower frequencies as the content of substituted cation in tetrahedral site increases, whereas The a11 and a12 bands moves towards higher frequencies. Linear relationships were found between a12 the band frequency and the extent of tetrahedral substitutions. The magnitude of shifts per molar substitution for the a12 bands is dependent on the species of substituted cation and decreases in the order Ga > Al > Ge > B, showing an intimate correlation with the field strength z1·z2/r2M–O of the substituted cations. This implies that the polarizing power of the substituted cations has a pronounced effect on the Si-O stretching vibrations.

Type
Research Article
Information
Clay Minerals , Volume 25 , Issue 2 , June 1990 , pp. 235 - 241
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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