skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Structure and disorder in ice VII on the approach to hydrogen-bond symmetrization

Journal Article · · Physical Review B

We have collected neutron-diffraction data of sufficient quality for structural refinement from deuterated ice VII to over 60 GPa. At these pressures, we are approaching the onset of molecular dissociation where the water molecule should be significantly distorted. We fitted our data with both the conventional structural model for ice VII and a recently proposed “interstitial” model. We found these to be statistically indistinguishable and, therefore, adopted the conventional model in this work. Here, our refinements yield the first direct experimental determination of the molecular structure in this pressure regime. They show a clear elongation of the covalent bond, the rate of which rapidly increases with pressure, indicating we have entered a distinct regime on the approach to ice X. In addition, we have directly measured the pressure dependence of the separation of the two equivalent deuteron sites along the hydrogen bonds, which provides an upper bound on the hydrogen-bond centering pressure.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC95-00OR22725; NA0001974; AC02-06CH11357
OSTI ID:
1607301
Alternate ID(s):
OSTI ID: 1515567
Journal Information:
Physical Review B, Vol. 99, Issue 18; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

References (31)

Optical study of H2O ice to 120GPa: Dielectric function, molecular polarizability, and equation of state journal February 2007
Novel diamond cells for neutron diffraction using multi-carat CVD anvils journal August 2017
Radiation attenuation by single-crystal diamond windows journal February 2017
Neutron Diffraction Study of the Structure of Ice journal May 1949
Infrared absorption study of Fermi resonance and hydrogen-bond symmetrization of ice up to 141 GPa journal November 1999
Correction of intensities for preferred orientation in powder diffractometry: application of the March model journal August 1986
Mathematische Theorie der Regelung nach der Korngestah bei affiner Deformation journal January 1932
Disordered structure of D 2 O ice VII from i n s i t u neutron powder diffraction journal July 1985
Neutron diffraction observations of interstitial protons in dense ice journal June 2013
VESTA : a three-dimensional visualization system for electronic and structural analysis journal May 2008
Infrared spectroscopic study of H 2 O D 2 O mixed ice up to 100 GPa journal August 2000
The uncoupled O–H stretch in ice VII. The infrared frequency and integrated intensity up to 189 kbar journal August 1984
Bulk moduli and equations of state of ice VII and ice VIII journal May 2017
Evidence for resonance-assisted hydrogen bonding. 4. Covalent nature of the strong homonuclear hydrogen bond. Study of the O-H--O system by crystal structure correlation methods journal February 1994
A Theory of Water and Ionic Solution, with Particular Reference to Hydrogen and Hydroxyl Ions journal August 1933
Infrared absorption study of the hydrogen-bond symmetrization in ice to 110 GPa journal December 1996
Ice vii, the Densest form of ice journal December 1964
Structures of Ice VII and Ice VIII to 20GPa. journal January 1998
In situ high-pressure x-ray diffraction study of H2O ice VII journal February 2008
Compression of H 2 O ice to 126 GPa and implications for hydrogen-bond symmetrization: Synchrotron x-ray diffraction measurements and density-functional calculations journal June 2008
Compression of Ice to 210 Gigapascals: Infrared Evidence for a Symmetric Hydrogen-Bonded Phase journal July 1996
Modulated phases and proton centring in ice observed by X-ray diffraction up to 170?GPa journal February 1999
Structure and hydrogen ordering in ices VI, VII, and VIII by neutron powder diffraction journal October 1984
Large-volume diamond cells for neutron diffraction above 90 GPa journal August 2013
Static compression of H2O-ice to 128 GPa (1.28 Mbar) journal December 1987
Calibration of the ruby pressure gauge to 800 kbar under quasi-hydrostatic conditions journal January 1986
Tunnelling and zero-point motion in high-pressure ice journal March 1998
Reassigning Hydrogen-Bond Centering in Dense Ice journal September 2002
Multisite Disordered Structure of Ice VII to 20 GPa journal September 1998
Raman Spectroscopy of Dense H 2 O and the Transition to Symmetric Hydrogen Bonds journal September 1999
Cascading Fermi Resonances and the Soft Mode in Dense Ice journal June 1997

Similar Records

Neutron diffraction observations of interstitial protons in dense Ice
Journal Article · Tue Jan 01 00:00:00 EST 2013 · Proceedings of the National Academy of Sciences · OSTI ID:1607301

Temperature-dependent kinetic pathways featuring distinctive thermal-activation mechanisms in structural evolution of ice VII
Journal Article · Mon Jun 22 00:00:00 EDT 2020 · Proceedings of the National Academy of Sciences of the United States of America · OSTI ID:1607301

Disordered structure of D/sub 2/O ice VII from in situ neutron powder diffraction
Journal Article · Mon Jul 01 00:00:00 EDT 1985 · J. Chem. Phys.; (United States) · OSTI ID:1607301