TY - JOUR
T1 - A high pressure Brillouin scattering study of vitreous boron oxide up to 57GPa
AU - Nicholas, Jason
AU - Sinogeikin, Stanislav
AU - Kieffer, John
AU - Bass, Jay
N1 - Funding Information:
This research was supported by the NSF grant # DMR-0230662. We also would like to thank J. Palko for fruitful discussions and A. Hofmeister for IR analysis of our sample.
PY - 2004/12/1
Y1 - 2004/12/1
N2 - Brillouin spectroscopy has been performed on vitreous boron oxide (B 2O3) from ambient pressure to 57GPa at room temperature. Upon initial compression to 53 GPa, the longitudinal and shear sound velocities increase gradually from 3.3 km/s to 13.1 km/s and from 1.8 km/s to 7.1 km/s respectively. Upon decompression, the shear and longitudinal sound velocities follow a different path than during compression. This path remains smooth until a discontinuity of approximately 2.7 km/s in the longitudinal velocity and 2.0 km/s in the shear velocity occurs near 2.8 GPa. This discontinuity returns the sound velocities to those seen during compression, and suggests a polyamorphic reorganization of the glass structure. The path dependent nature of the properties and the discontinuity at 2.8 GPa can also be seen in the Poisson's ratio and the index of refraction. A second compression-decompression cycle to 57 GPa produces the same behavior as the first cycle, confirming that the 2.8 GPa discontinuity does in fact return the glass to its original structure. The existence of a sharp transition in glass properties, such as was observed here, provides strong support for the existence of vitreous polymorphs.
AB - Brillouin spectroscopy has been performed on vitreous boron oxide (B 2O3) from ambient pressure to 57GPa at room temperature. Upon initial compression to 53 GPa, the longitudinal and shear sound velocities increase gradually from 3.3 km/s to 13.1 km/s and from 1.8 km/s to 7.1 km/s respectively. Upon decompression, the shear and longitudinal sound velocities follow a different path than during compression. This path remains smooth until a discontinuity of approximately 2.7 km/s in the longitudinal velocity and 2.0 km/s in the shear velocity occurs near 2.8 GPa. This discontinuity returns the sound velocities to those seen during compression, and suggests a polyamorphic reorganization of the glass structure. The path dependent nature of the properties and the discontinuity at 2.8 GPa can also be seen in the Poisson's ratio and the index of refraction. A second compression-decompression cycle to 57 GPa produces the same behavior as the first cycle, confirming that the 2.8 GPa discontinuity does in fact return the glass to its original structure. The existence of a sharp transition in glass properties, such as was observed here, provides strong support for the existence of vitreous polymorphs.
UR - http://www.scopus.com/inward/record.url?scp=9644289332&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=9644289332&partnerID=8YFLogxK
U2 - 10.1016/j.jnoncrysol.2004.08.258
DO - 10.1016/j.jnoncrysol.2004.08.258
M3 - Conference article
AN - SCOPUS:9644289332
SN - 0022-3093
VL - 349
SP - 30
EP - 34
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 1-3
T2 - Glass Science for High Technology. 16th University Conference
Y2 - 13 August 2004 through 15 August 2004
ER -