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Melting and premelting of silicates: Raman spectroscopy and X-ray diffraction of Li2SiO3 and Na2SiO3

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Abstract

The isostructural lithium (Li2SiO3) and sodium (Na2SiO3) metasilicates have been investigated from room temperature up to the melting point by single-crystal Raman spectroscopy and energy-dispersive X-ray powder diffraction. The unit-cell parameters and Raman frequencies of Li2SiO3 vary regularly with temperature up to the melting point, which is consistent with the lack of premelting effects in calorimetric measurements. In contrast, Na2SiO3 undergoes a transition at about 850 K from orthorhombic Cmc 21 symmetry, to a lower symmetry (possibly Pmc 21), and shows near 1200 K changes in the Raman spectra that correlate well with the premelting effects as determined from calorimetry observations. In both compounds, a high alkali mobility likely sets in several hundreds of degrees below the melting point. Premelting in Na2SiO3 is associated with extensive deformation of the silicate chains as evidenced near the melting point by similarities in the Raman spectra of the crystalline and liquid phases.

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Authors and Affiliations

  1. Laboratoire des Géomatériaux, Institut de Physique du Globe, URA 734 CNRS, 4 place Jussieu, 75252, Paris cedex 05, France

    Pascal Richet & Denis Andrault

  2. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd, 20015, Washington, D.C., USA

    Bjorn O. Mysen

  3. NSF-sponsored Center for High-Pressure Research (CHiPR), USA

    Bjorn O. Mysen

Authors
  1. Pascal Richet
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  2. Bjorn O. Mysen
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  3. Denis Andrault
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Richet, P., Mysen, B.O. & Andrault, D. Melting and premelting of silicates: Raman spectroscopy and X-ray diffraction of Li2SiO3 and Na2SiO3 . Phys Chem Minerals 23, 157–172 (1996). https://doi.org/10.1007/BF00220727

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  • DOI: https://doi.org/10.1007/BF00220727

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