Compression of Ice to 210 Gigapascals: Infrared Evidence for a Symmetric Hydrogen-Bonded Phase

Goncharov, Alexander F.; Struzhkin, Viktor V.; Somayazulu, Maddury; Hemley, Russell J.; Mao, Ho‐kwang

doi:10.1126/science.273.5272.218

Cited by 305 publications

(262 citation statements)

References 23 publications

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“…This structure is in contrast to that of isovalent symmetric ice (ice X), where the oxygen sublattice forms a bcc arrangement [2]. However, a further transformation to an antifluorite phase in ice at some pressure above 150 GPa has been predicted [3,4], and experiments show changes in vibrational mode coupling [5] and single-crystal xray diffraction peak intensity [7] near 150 GPa. Recent studies argue that a new phase is either hexagonal or orthorhombic [6], but the existence and nature of this phase and the pressure at which it is reached are still uncertain [7,8].…”

Section: Introductionmentioning

confidence: 82%

Pressure-induced antifluorite-to-anticotunnite phase transition in lithium oxide

et al. 2006

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Using synchrotron angle-dispersive x-ray diffraction (ADXD) and Raman spectroscopy on samples of Li 2 O pressurized in a diamond anvil cell, we observed a reversible phase change from the cubic antifluorite (α, Fm-3m) to orthorhombic anticotunnite (β, Pnma) phase at 50(±5) GPa at ambient temperature. This transition is accompanied by a relatively large volume collapse of 5.4 (±0.8) % and large hysteresis upon pressure reversal (P down at ∼25 GPa). Contrary to a recent study, our data suggest that the high-pressure β-phase (B o = 188±12 GPa) is substantially stiffer than the low-pressure α-phase (B o = 90±1 GPa). A relatively strong and pressure-dependent preferred orientation in β-Li 2 O is observed. The present result is in accordance with the systematic behavior of antifluorite-to-anticotunnite phase transitions occurring in the alkali-metal sulfides.

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Section: Introductionmentioning

confidence: 82%

Pressure-induced antifluorite-to-anticotunnite phase transition in lithium oxide

et al. 2006

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“…These results indicated that the transition temperature decreases linearly with pressure above 15 GPa; around 62 GPa for H 2 O and 72 GPa for D 2 O, the transition temperature drops to 0 K. Upon further compression, the hydrogen bonds in ices VII and VIII become symmetric at high pressures of 60 GPa, as suggested by Kamb and Davis. 19 The symmetric transition was substantiated by IR spectroscopy at around 60 GPa 22,34 meaning that the protons are located at the hydrogen-bond midpoints at ϳ100 GPa ͑Refs. 35-37͒ to ϳ150 GPa.…”

Section: B Raman Spectroscopymentioning

confidence: 99%

“…35-37͒ to ϳ150 GPa. 38 The appearance of a new Raman-active mode with a lower frequency at ϳ150 cm −1 lower than the Tz B 1g + T x,y E g provides new information on the mechanism of the transition to ice X.…”

Section: B Raman Spectroscopymentioning

confidence: 99%

High-pressure x-ray diffraction and Raman spectroscopy of ice VIII

Yoshimura

Stewart

Somayazulu

et al. 2006

The Journal of Chemical Physics

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In situ high-pressure/low-temperature synchrotron x-ray diffraction and optical Raman spectroscopy were used to examine the structural properties, equation of state, and vibrational dynamics of ice VIII. The x-ray measurements show that the pressure-volume relations remain smooth up to 23 GPa at 80 K. Although there is no evidence for structural changes to at least 14 GPa, the unit-cell axial ratio c∕a undergoes changes at 10–14 GPa. Raman measurements carried out at 80 K show that the νTzA1g+νTx,yEg lattice modes for the Raman spectra of ice VIII in the lower-frequency regions (50–800cm−1) disappear at around 10 GPa, and then a new peak of ∼150cm−1 appears at 14 GPa. The combined data provide evidence for a transition beginning near 10 GPa. The results are consistent with recent synchrotron far-IR measurements and theoretical calculations. The decompressed phase recovered at ambient pressure transforms to low-density amorphous ice when heated to ∼125K.

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“…-3200 cm -1 with shoulder at slightly higher energy are from the ν 1 and ν 3 symmetric OH-stretching modes in ice VII (44,45). Based on the experimentally determined pressure dependence of these modes (44,45) the energy of these modes corresponds to pressures above 5 and below 23 GPa pressure.…”

Section: Fig S2amentioning

confidence: 99%

Ice-VII inclusions in diamonds: Evidence for aqueous fluid in Earth’s deep mantle

Tschauner

Huang

Greenberg

et al. 2018

Science

176

134

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Encapsulating Earth's deep water filter Small inclusions in diamonds brought up from the mantle provide valuable clues to the mineralogy and chemistry of parts of Earth that we cannot otherwise sample. Tschauner et al. found inclusions of the high-pressure form of water called ice-VII in diamonds sourced from between 410 and 660 km depth, the part of the mantle known as the transition zone. The transition zone is a region where the stable minerals have high water storage capacity. The inclusions suggest that local aqueous pockets form at the transition zone boundary owing to the release of chemically bound water as rock cycles in and out of this region. Science , this issue p. 1136

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Compression of Ice to 210 Gigapascals: Infrared Evidence for a Symmetric Hydrogen-Bonded Phase

Cited by 305 publications

References 23 publications

Pressure-induced antifluorite-to-anticotunnite phase transition in lithium oxide

Pressure-induced antifluorite-to-anticotunnite phase transition in lithium oxide

High-pressure x-ray diffraction and Raman spectroscopy of ice VIII

Ice-VII inclusions in diamonds: Evidence for aqueous fluid in Earth’s deep mantle

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