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X-ray absorption study of vermiculite mica

D C Jain, B K Sharma and K B Garg

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The K-absorption spectrum has been studied in vermiculite mica with a view to studying its Fe2+/Fe3+ ratio and Fe-O bond length before and after subjecting it to heat treatment at 800 degrees C. The heat treatment is found to lead to near total conversion of Fe2+ to Fe3+, but the value of the bond length does not seem to change significantly. The 'white line' observed in its spectrum, ascribed to exciton levels, is found to broaden on heat treatment. The results are compared with those obtained on other trioctahedral micas in an earlier study.


PACS

81.40.Tv Optical and dielectric properties (related to treatment conditions)

71.35.-y Excitons and related phenomena

81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization

61.50.Lt Crystal binding; cohesive energy

78.70.Dm X-ray absorption spectra

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 1 (14 January 1981)



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