Abstract
Physical property measurements are reported for beryl glass and for three 60 mole % SiO2 melts (including beryl) at temperatures above 1600° C. Electron micrographic evidence shows that beryl glass has undergone a two-liquid phase separation. Density measurements of this glass and its melt can be interpreted in terms of the dissociation of Si6O18 −12 rings as beryl melts incongruently. The presence of discrete BeO4 tetrahedra and AlO6 octahedra in molten beryl is suggested by the electrical conductance and viscosity data for these melts.
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Riebling, E.F., Duke, D.A. BeO·Al2O3·SiO2 system: Structural relationships of crystalline, glassy, and molten beryl. J Mater Sci 2, 33–39 (1967). https://doi.org/10.1007/BF00550050
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DOI: https://doi.org/10.1007/BF00550050