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Phonon spectra and rigid-ion model calculations on andalusite

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Abstract

Polarised Raman and infrared spectra of (ir) andalusite (Al2SiO5) single crystals have been measured and interpreted on the basis of a rigid-ion model calculation. The Al-O bond strength is found to be about 70% ionic in character whereas the mainly covalently bound SiO4 tetrahedra show ca. 40% ionicity. The interatomic short range forces are strongest between silicon and oxygen and rather weak around the fivefold coordinated aluminium. Thermal soft modes appear above 200°C and are correlated with a weakening of the Al-O bonds.

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Authors and Affiliations

  1. Mineralogisches Institut der Universität Hannover, Welfengarten 1, D-3000, Hannover, Germany (F.R.G.)

    K. Iishi, E. Salje & Ch. Werneke

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  1. K. Iishi
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  2. E. Salje
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  3. Ch. Werneke
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Additional information

On leave from the Department of Mineralogical Sciences, Faculty of Literature and Science, Yamaguchi University, Yamaguchi, 753 Japan, with support from the Alexander von Humboldt Foundation

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Iishi, K., Salje, E. & Werneke, C. Phonon spectra and rigid-ion model calculations on andalusite. Phys Chem Minerals 4, 173–188 (1979). https://doi.org/10.1007/BF00307561

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  • DOI: https://doi.org/10.1007/BF00307561

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