Computer Science
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..40..137v&link_type=abstract
Earth and Planetary Science Letters, Volume 40, Issue 1, p. 137-140.
Computer Science
12
Scientific paper
Infrared and X-ray radiation data indicate that the effect of pressure on Na-Al-Si-O quenched melt is to change the coordination number of trivalent aluminum ions from four to six. This conclusion is based upon an observed decrease in the intensity of the infrared vibration involving a ``bridging'' oxygen in the polymer structure and a shift in both Al Kα (7 × 10-4 Å) and Al Kβ (20 × 10-4 Å) radiation. The amount of AlIV or AlVI seems to be a continuous function of the pressure at which the melt was formed and is thus independent of the coordination change effected at high pressure in solids crystallized from the NaAlSi2O6 composition used in this study. The importance of the continuous shift of coordination number of aluminum ions in silicate melts at high pressure is discussed. The change in coordination of Al would also be expected in natural silicate melts (magmas) at high pressures.
Kushiro Ikuo
Velde Bruce
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