Large-volume diamond cells for neutron diffraction above 90GPa

Journal Article · Tue Jan 01 00:00:00 EST 2013 · High Pressure Research

DOI:https://doi.org/10.1080/08957959.2013.823197· OSTI ID:1116499

Boehler, Reinhard ^[1]; Guthrie, Malcolm ^[1]; Molaison, Jamie J ^[2]; Moreira Dos Santos, Antonio F ^[2]; Sinogeikin, Stanislav ^[1]; Machida, Shinichi ^[2]; Pradhan, Neelam ^[2]; Tulk, Christopher A ^[2]

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1. Carnegie Institution of Washington
2. ORNL

Quantitative high pressure neutron-diffraction measurements have traditionally required large sample volumes of at least 25 mm3 due to limited neutron flux. Therefore, pressures in these experiments have been limited to below 25 GPa. In comparison, for X-ray diffraction, sample volumes in conventional diamond cells for pressures up to 100 GPa have been less than 1 10 4 mm3. Here, we report a new design of strongly supported conical diamond anvils for neutron diffraction that has reached 94 GPa with a sample volume of 2 10 2 mm3, a 100-fold increase. This sample volume is sufficient to measure full neutron-diffraction patterns of D2O ice to this pressure at the high flux Spallation Neutrons and Pressure beamline at the Oak Ridge National Laboratory. This provides an almost fourfold extension of the previous pressure regime for such measurements.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1116499
• Journal Information: High Pressure Research, Vol. 33, Issue 3; ISSN 0895--7959
• Country of Publication: United States
• Language: English

Related Subjects

High Pressure
Diamond anvil cell
neutron diffraction