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Sound speed and refractive index of amorphous CaSiO3 upon pressure cycling to 40 GPa

Journal Article · · American Mineralogist
DOI:https://doi.org/10.2138/am-2022-8081· OSTI ID:2417879
Abstract

Brillouin spectroscopy at room temperature and pressures up to 40 GPa documents nearly identical elasticity and refractive index of amorphous CaSiO3 created by two different methods: temperature-quenching the melt at ambient pressure and pressure-amorphizing crystalline wollastonite at room temperature. We find reproducible hysteresis of 0 to 8% on pressure cycling that is small relative to the 30 to 60% changes in shear and longitudinal wave velocities over this pressure range. Together with observed changes in refractive index and previous results from Raman spectroscopy, these measurements reveal a continuous and reversible change in atomic packing induced by pressure. Unlike many other silicate glasses, amorphous CaSiO3 exhibits highly reproducible properties, behaving smoothly and reversibly under pressure cycling and possessing similar structure and elasticity regardless of synthesis paths for the starting material, which suggests that the amorphous solid may mimic the liquid over the pressure range investigated.

Research Organization:
Carnegie Inst. of Washington, Washington, DC (United States); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
DOE Contract Number:
NA0002006; AC02-05CH11231;
OSTI ID:
2417879
Journal Information:
American Mineralogist, Journal Name: American Mineralogist Journal Issue: 12 Vol. 107; ISSN 0003-004X
Publisher:
Mineralogical Society of America
Country of Publication:
United States
Language:
English

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