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Vibrational spectroscopy of beryllium aluminosilicates: Heat capacity calculations from band assignments

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Abstract

Far-infrared, mid-IR, and Raman powder spectra were measured on six phases (bromellite, chrysoberyl, phenakite, bertrandite, beryl, and euclase) in the system BeO-Al2O3-SiO2-H2O. A single-crystal absorption spectrum of IR fundamentals in beryl is also presented, which more closely resembles the powder absorption spectrum than it does absorption spectra calculated from single-crystal reflection data.

Assignments of the SiO4 and BeO4 internal vibrations are made in accordance with each mineral's symmetry and composition and by comparison to structural analogs. Heat capacities C v calculated for these partial band assignments agree with C v derived from experimental C p for all six phases, provided that Kieffer's (1979c) model is slightly modified to correctly enumerate both Si-O and Be-O stretching modes in the high frequency region (>750 cm−1). Si-O stretching bands were found to out-number Be-O stretching modes in the high-energy region of the vibrational spectra with two exceptions: (1) For those phases containing oxygen ions not coordinated to silicon, vibrations occurring at v>1,080 cm−1 that are attributable to Be-O (H) stretching must be treated separately in the model in order to calculate C v accurately. (2) Minerals consisting entirely of interlocking Si and Be tetrahedra (i.e., phases without Al or OH) can be modeled by one optic continuum representing all optical modes. These results, along with the occurrence of very low energy lattice vibrations for Be-silicates within Al, suggests that although Be-O bonds are generally weaker than neighboring Si-O bonds, Be mimics the network-forming characteristic of Si to a limited extent.

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Authors and Affiliations

  1. Geophysical Laboratory, Carnegie Institution of Washington, 2801 Upton St. N.W., 20008, Washington, D.C., USA

    A. M. Hofmeister, T. C. Hoering & D. Virgo

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  1. A. M. Hofmeister
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  2. T. C. Hoering
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  3. D. Virgo
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Hofmeister, A.M., Hoering, T.C. & Virgo, D. Vibrational spectroscopy of beryllium aluminosilicates: Heat capacity calculations from band assignments. Phys Chem Minerals 14, 205–224 (1987). https://doi.org/10.1007/BF00307985

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