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Determination of the degree of Al, Si order Q od in kinetically disordered albite using hard mode infrared spectroscopy

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Abstract

Hard Mode Infrared Spectroscopy (HMIS) is used to correlate the line shifts Δω, the intensity changes ΔA and the variations of spectral line widths Γ of infrared absorption bands with the degree of Al, Si ordering, Q od, in kinetically disordered Na-feldspar.

A simple relationship Δω∝ΔA∝ΔΓ∝Q 2od was found with the phonon band around 650 cm−1 being particularly sensitive to small changes of the degree of Al, Si ordering. It is shown that the average degree of Al, Si order can be determined from HMIS with an accuracy of ca. 8 percent using 50 mg of Na-feldspar. The experimental results agree well with recent X-ray determinations using identical samples. The significance of HMIS for the study of kinetic processes in minerals is explained.

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Authors and Affiliations

  1. Department of Earth Sciences, University of Cambridge, Downing Street, CB2 3EQ, Cambridge, England

    E. Salje, B. Güttler & C. Ormerod

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  1. E. Salje
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  2. B. Güttler
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  3. C. Ormerod
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Salje, E., Güttler, B. & Ormerod, C. Determination of the degree of Al, Si order Q od in kinetically disordered albite using hard mode infrared spectroscopy. Phys Chem Minerals 16, 576–581 (1989). https://doi.org/10.1007/BF00202214

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  • DOI: https://doi.org/10.1007/BF00202214

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