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Updated: Mar 7, 2026
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
Transformation in intermediate-range structure of vitreous silica under high pressure and temperature
Y Inamura1, Y Katayama, W Utsumi
1Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Naka, Ibaraki 319-1195, Japan.
Abstract:
The pressure dependence of the structure factor for vitreous silica was measured up to 8.3 GPa at 500 °C by means of an in situ x-ray diffraction method. The position of the first sharp diffraction peak (FSDP) moved to a higher momentum transfer as the pressure increased. It moved rapidly between 3.3 and 5.8 GPa, and then the slope of the FSDP position as a function of pressure decreased. The pressure dependence of the position is the same as that for a sample heated to 500 °C after room-temperature compression. On decompression at 500 °C, the position of the FSDP showed hysteresis. The pressure dependence of the FSDP position suggests that the permanent densification of vitreous silica is realized due to preservation of the intermediate-range structure stabilized at high pressure and temperature.
