Abstract
The volume of glassy a-SiO2 upon compression to 9 GPa was measured in situ at high temperatures up to 730 K and at both pressure buildup and release. It was established that the residual densification of a-SiO2 glass after high-pressure treatment was due to the irreversible transformation accompanied by a small change in volume directly under pressure. The bulk modulus of the new amorphous modification was appreciably higher (80% more than its original value), giving rise to residual densification as high as 18% under normal conditions. It was shown that the transformation pressure shifted to a lower pressure of about 4 GPa with a rise in temperature. A conclusion was drawn about the existence of at least two pressure-induced phase transitions accompanied by structure rearrangement in a-SiO2. A nonequilibrium phase diagram is suggested for glassy SiO2. It accounts for all the presently available experimental data and is confirmed by the existing modeling data.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 75, No. 7, 2002, pp. 413–418.
Original Russian Text Copyright © 2002 by El’kin, Brazhkin, Khvostantsev, Tsiok, Lyapin.
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El’kin, F.S., Brazhkin, V.V., Khvostantsev, L.G. et al. In situ study of the mechanism of formation of pressure-densified Sio2 glasses. Jetp Lett. 75, 342–347 (2002). https://doi.org/10.1134/1.1485264
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DOI: https://doi.org/10.1134/1.1485264