Similarities in the behaviour of magnesium and calcium in silicate glasses

The dependence of the infrared reflection spectra of mixed sodium-alkaline earth-silicate glasses on magnesium or calcium content shows similarities. This is surprising in view of previous observations indicating a possible network-forming role for magnesium. In these glasses, a well localized band...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1994-06, Vol.170 (2), p.175-181
Main Authors: Hauret, G., Vaills, Y., Luspin, Y., Gervais, F., Coté, B.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Disordered solids
Exact sciences and technology
Infrared and raman spectra and scattering
Lattice dynamics
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
Vibrational states in disordered systems
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Summary:The dependence of the infrared reflection spectra of mixed sodium-alkaline earth-silicate glasses on magnesium or calcium content shows similarities. This is surprising in view of previous observations indicating a possible network-forming role for magnesium. In these glasses, a well localized band for calcium or magnesium is observed at frequencies similar to those found in CaO or MgO. However calculation of the effective charge carried by each type of cation gives a degree of ionicity, Z/ Z 0, of 0.9 for calcium but only 0.7 for magnesium. This difference explains why magnesium might have some network-forming character in alumino-silicate glasses.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(94)90044-2