Structures of sodium alumino- and gallosilicate glasses and their germanium analogs

Details Structures of sodium alumino- and gallosilicate glasses and their germanium analogs Structures of sodium alumino- and gallosilicate glasses and their germanium analogs

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1913m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 49, Issue 9, pp.1913-1924

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Polarized Raman spectra of SiO 2 and GeO 2 glasses are related on the basis of frequencies, band-shapes, and polarization characteristics. The spectra are consistent with structures composed of continuous networks of SiO 4 and GeO 4 tetrahedra. The presence of depolarized TO and LO components of the antisymmetric stretching mode in the high frequency region of both spectra indicates that these single component glasses retain some degree of intermediate range order. Features in the polarized spectra of NaAlSi 3 O 8 , NaAlSi 2 O 6 , and NaAlSiO 4 glasses and their Ga- (for Al) and/or Ge- (for Si) substituted counterparts are also consistent with the assignment of three-dimensional tetrahedral framework (TDTF) structures to these glasses. The gallosilicate and alumino- and gallogermanate glasses provide structural analogs for the framework aluminosilicate glasses of geological significance. The high-frequency antisymmetric stretching features in the Raman spectra of the TDTF aluminosilicate glasses and their Ga- and/or Ge-substituted analogs show an overlapping doublet of bands whose frequencies vary continuously with glass composition. Both the intensity and position of the higher frequency component are more strongly dependent on Al(Ga) content than is the lower frequency component. Some coupling of the antisymmetric stretching modes of Si(Ge)O 4 tetrahedra and Al(Ga)O 4 tetrahedra is indicated. The higher frequency component of the doublet is more strongly polarized than the lower frequency component, which results from the splitting of the antisymmetric stretching (F) mode of Si(Ge)O 4 tetrahedra. This splitting results from the lowering of the average of Si(Ge)O 4 tetrahedra site symmetries because of the presence of Al(Ga)O 4 units in the glass network.

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