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Title: Advancing neutron diffraction for accurate structural measurement of light elements at megabar pressures

Journal Article · · Scientific Reports

Over the last 60 years, the diamond anvil cell (DAC) has emerged as the tool of choice in high pressure science because materials can be studied at megabar pressures using X-ray and spectroscopic probes. In contrast, the pressure range for neutron diffraction has been limited due to low neutron flux even at the strongest sources and the resulting large sample sizes. Here, we introduce a neutron DAC that enables break-out of the previously limited pressure range. Key elements are ball-bearing guides for improved mechanical stability, gem-quality synthetic diamonds with novel anvil support and improved in-seat collimation. We demonstrate a pressure record of 1.15 Mbar and crystallographic analysis at 1 Mbar on the example of nickel. Additionally, insights into the phase behavior of graphite to 0.5 Mbar are described. These technical and analytical developments will further allow structural studies on low-Z materials that are difficult to characterize by X-rays.

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
OSTI ID:
1965261
Journal Information:
Scientific Reports, Vol. 13, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

References (43)

Light-Transparent Phase Formed by Room-Temperature Compression of Graphite journal June 1991
Development of a technique for high pressure neutron diffraction at 40 GPa with a Paris-Edinburgh press journal June 2019
Equation of state of lithium deuteride from neutron diffraction under high pressure journal February 1992
Synthesis of cubic silicon nitride journal July 1999
Atomic distribution and local structure in ice VII from in situ neutron diffraction journal September 2022
Novel diamond cells for neutron diffraction using multi-carat CVD anvils journal August 2017
Radiation attenuation by single-crystal diamond windows journal February 2017
Mantid—Data analysis and visualization package for neutron scattering and μ SR experiments
  • Arnold, O.; Bilheux, J. C.; Borreguero, J. M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 764 https://doi.org/10.1016/j.nima.2014.07.029
journal November 2014
Developments of nano-polycrystalline diamond anvil cells for neutron diffraction experiments journal January 2020
Single-crystal neutron diffraction in diamond anvil cells with hot neutrons journal February 2018
The DN-6 Neutron Diffractometer for High-Pressure Research at Half a Megabar Scale journal August 2018
High-pressure structure and electronic properties of YbD 2 to 34 GPa journal July 2019
A suite-level review of the neutron powder diffraction instruments at Oak Ridge National Laboratory journal September 2018
Methods for neutron diffraction studies on hydride superconductors and other metal hydrides journal December 2021
X-ray energy-dispersive diffractometry using synchrotron radiation journal December 1977
Toroidal diamond anvil cell for detailed measurements under extreme static pressures journal July 2018
Static Pressure of 255 GPa (2.55 Mbar) by X-Ray Diffraction: Comparison with Extrapolation of the Ruby Pressure Scale journal August 1988
Neutron diffraction observations of interstitial protons in dense ice journal June 2013
Bonding Changes in Compressed Superhard Graphite journal October 2003
Materials synthesis at terapascal static pressures journal May 2022
GSAS-II : the genesis of a modern open-source all purpose crystallography software package journal March 2013
A nano-polycrystalline diamond anvil cell with bulk metallic glass cylinder for single-crystal neutron diffraction journal December 2019
Implementation of micro-ball nanodiamond anvils for high-pressure studies above 6 Mbar journal January 2012
Diamond cells and new materials journal November 2005
Static compression of iron to 300 GPa and Fe 0.8 Ni 0.2 alloy to 260 GPa: Implications for composition of the core journal January 1990
Single crystal toroidal diamond anvils for high pressure experiments beyond 5 megabar journal September 2018
High-pressure experiments and the phase diagram of lower mantle and core materials journal May 2000
Specific volume measurements of Cu, Mo, Pd, and Ag and calibration of the ruby R 1 fluorescence pressure gauge from 0.06 to 1 Mbar journal June 1978
Neutron and X-ray diffraction study of the broken symmetry phase transition in solid deuterium journal June 2005
Structure and disorder in ice VII on the approach to hydrogen-bond symmetrization journal May 2019
Crystal structure of graphite under room-temperature compression and decompression journal July 2012
High‐pressure, high‐temperature equations of state using nanofabricated controlled‐geometry Ni/SiO 2 /Ni double hot‐plate samples journal December 2015
Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system journal August 2015
Neutron diffraction experiments in diamond and sapphire anvil cells journal January 2004
Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures journal January 2019
Large-volume diamond cells for neutron diffraction above 90 GPa journal August 2013
Neutron powder diffraction at pressures beyond 25 GPa journal April 1995
Static compression of H2O-ice to 128 GPa (1.28 Mbar) journal December 1987
Optical reflectivity of graphite under pressure journal July 1989
Compression curves of transition metals in the Mbar range: Experiments and projector augmented-wave calculations journal September 2008
Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure journal August 2021
Calibration of the ruby pressure gauge to 800 kbar under quasi-hydrostatic conditions journal January 1986
The insulator-metal transition in hydrogen journal July 2010

Figures / Tables (5)