2022
DOI: 10.1103/physrevlett.128.077403
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Electronic, Structural, and Mechanical Properties of SiO2 Glass at High Pressure Inferred from its Refractive Index

Abstract: We report the first direct measurements of the refractive index of silica glass up to 145 GPa that allowed quantifying its density, bulk modulus, Lorenz-Lorentz polarizability, and band gap. These properties show two major anomalies at ∼10 and ∼40 GPa. The anomaly at ∼10 GPa signals the onset of the increase in Si coordination, and the anomaly at ∼40 GPa corresponds to a nearly complete vanishing of fourfold Si. More generally, we show that the compressibility and density of noncrystalline solids can be accura… Show more

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Cited by 8 publications
(13 citation statements)
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“…The flat tips of diamond anvils form an interferometer; thus, the distance between the anvils can be measured directly by analyzing the interference pattern in the spectrum of a reflected (or transmitted) white light if the refractive index of the sample is known (Dewaele et al., 2003; Kim et al., 2021). Here we apply a recently developed approach (Lobanov et al., 2022) to measure the diamond‐to‐diamond separation upon compression up to ∼135 GPa ( P at the CMB) and subsequent decompression. Briefly, our approach involves reflecting a broadband laser probe from the diamond‐sample‐diamond assemblage and recording the reflected signal on a charge‐coupled device.…”
Section: Methodsmentioning
confidence: 99%
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“…The flat tips of diamond anvils form an interferometer; thus, the distance between the anvils can be measured directly by analyzing the interference pattern in the spectrum of a reflected (or transmitted) white light if the refractive index of the sample is known (Dewaele et al., 2003; Kim et al., 2021). Here we apply a recently developed approach (Lobanov et al., 2022) to measure the diamond‐to‐diamond separation upon compression up to ∼135 GPa ( P at the CMB) and subsequent decompression. Briefly, our approach involves reflecting a broadband laser probe from the diamond‐sample‐diamond assemblage and recording the reflected signal on a charge‐coupled device.…”
Section: Methodsmentioning
confidence: 99%
“…The sample thickness ( l ) is then obtained from the spectral separation of the observed extrema which yields the optical path length ( n 600nm l ) under the assumption that index dispersion in the measured spectral range is small. The overall uncertainty in l is ∼1% (Lobanov et al., 2022).…”
Section: Methodsmentioning
confidence: 99%
See 3 more Smart Citations