Abstract
High-pressure powder neutron diffraction of wüstite-Fe0.93O has been achieved to 12 GPa using a large gemmoissanite (SiC) anvil cell. The moissanite anvils are weakly absorbing and provide greater neutron fluxes to the sample than is possible with tungsten carbide anvils. There is minimal diffraction overlap from the single-crystal moissanite anvils compared to tungsten carbide or synthetic diamond anvils, providing cleaner background profiles. The required sample volume for high-pressure neutron diffraction is dramatically reduced to several cubic millimeters. High-quality powder diffraction patterns of wüstite were recorded at 90 min exposure times on the HIPPO diffractometer at LANSCE when the sample volume was in the range of ∼10 mm3. This is about two orders of magnitude smaller than the necessary sample volume (∼1.0 cm3) for the same kind of experiment with other high-pressure cells and nominal neutron fluxes.
Original language | English (US) |
---|---|
Pages (from-to) | 247-253 |
Number of pages | 7 |
Journal | High Pressure Research |
Volume | 24 |
Issue number | 2 |
DOIs | |
State | Published - Jun 2004 |
Funding
We thank B. Lindemer for comments on the manuscript and the use of the HPCAT facilities. This work was supported by DOE-BES, DOE-NNSA, NSF, DOD-TACOM and the W. M. Keck Foundation. LANSCE is a national user facility funded by the DOE, BES-Material Sciences, under contract number W-7405-ENG-36 with the University of California.
Keywords
- High pressure
- Moissanite anvil cell
- Neutron diffraction
- Wüstite
ASJC Scopus subject areas
- Condensed Matter Physics