Abstract
Density and Al Kβ X-ray emission band of the albite melts quenched at high pressure up to 8 GPa were measured. The density of the glass increases continuously from 2.473g/cm3 at 2 GPa to 2.743g/cm3 at 8 GPa. The rate of density increase however is not constant but relatively large in the pressure range of 2-6 GPa, suggesting that some structural change of the albite glass takes place in this pressure range. Measurement of Al Kβ emission bands of the albite glass revealed that the emission band shifts towards the higher energy side with increasing pressure. Present measurements of density and Al Kβ emission band of the albite glass are consistent with the results of the 27Al NMR spectrometry of the glass (Ohtani et al., 1985), suggesting a coordination change of Al3+ ions in the melt from 4-fold to 6-fold with increasing pressure.
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