Abstract
A simple modified Bridgman design for large volume pressure anvils usable in the Paris-Edinburgh (PE) press has been demonstrated at Oak Ridge National Laboratory Spallation Neutron Source. The design shows advantages over the toroidal anvils typically used in the PE press, mainly rapid compression/decompression rates, complete absence of blow-outs upon drastic phase transitions, simplified cooling, high reliability, and relative low loads (∼40 tons) corresponding to relatively high pressures (∼20 GPa). It also shows advantages over existing large-volume diamond cells as sample volumes of ∼2–3 mm3 can be easily and rapidly synthesized. The anvils thus allow sample sizes sufficient for in situ neutron diffraction as well as rapid synthesis of adequate amounts of new materials for ex situ analysis via total neutron scattering and neutron spectroscopy.
| Original language | English |
|---|---|
| Pages (from-to) | 426-437 |
| Number of pages | 12 |
| Journal | High Pressure Research |
| Volume | 39 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2019 |
Funding
BH acknowledges funding through a Weinberg Fellowship sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. RB was partially supported by EFree, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0001057. Research was conducted at three beamlines of ORNL's Spallation Neutron Source, SNAP, NOMAD and VISION, all supported through DOE-BES's Scientific User Facilities division. The authors gratefully acknowledge highly helpful discussion with Malcolm Guthrie (ESS, Sweden) throughout this work.
Keywords
- High pressure neutron scattering
- high pressure material synthesis
- pure amorphous silicon and germanium