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O
glass by the direct measurement of the densityBrazhkin, V. V.*; Tsiok, O. B.*; Katayama, Yoshinori
JETP Letters, 89(5), p.244 - 248, 2009/05
Times Cited Count：15 Percentile：62.80(Physics, Multidisciplinary)Relative volume change of vitreous BO have been precisely measured by the strain-gauge technique at hydrostatic pressures up to 9 GPa. Smeared anomalies of compressibility (at P 
0.5 GPa and P 5 GPa) and logarithmic relaxation of the glass density are observed. It has been revealed that there is a significant difference between the relaxed bulk modulus of glass obtained from the volume measurements and the unrelaxed modulus estimated from the Brillouin spectroscopic data. The basic features of the phase transitions in BO glass is revealed by the measurements of the relative volume change under compression together with the previous structure investigations and computer simulation results. Both direct and reverse transitions are smeared in pressure. The residual densification in glass is not associated with change in the short-range order.
O glass under high pressureBrazhkin, V. V.*; Katayama, Yoshinori; Trachenko, K.*; Tsiok, O. B.*; Lyapin, A. G.*; Artacho, E.*; Dove, M.*; Ferlat, G.*; Inamura, Yasuhiro; Saito, Hiroyuki
Physical Review Letters, 101(3), p.035702_1 - 035702_4, 2008/07
Times Cited Count：85 Percentile：90.90(Physics, Multidisciplinary)We study polyamorphism of BO glass using X-ray diffraction up to 10 GPa in the 300-700 K temperature range, in situ volumetric measurements up to 9 GPa, and first-principles simulations. The glass undergoes two-stage transformations under pressure including a gradual increase of the first B-O (O-B) coordination numbers above 5 GPa. The fraction of boron atoms in the fourfold-coordinated state at P
10 GPa is smaller than was assumed from inelastic X-ray scattering spectroscopy data, but is considerably larger than was previously suggested by the classical molecular dynamics simulations. The observed transformations under both compression and decompression are broad in hydrostatic conditions.
