Nanoprobe measurements of materials at megabar pressures.
The use of nanoscale x-ray probes overcomes several key limitations in the study of materials up to multimegabar (> 200) pressures, namely, the spatial resolution of measurements of multiple samples, stress gradients, and crystal domains in micron to submicron size samples in diamond-anvil cells. Mixtures of Fe, Pt, and W were studied up to 282 GPa with 250-600 nm size synchrotron x-ray absorption and diffraction probes. The probes readily resolve signals from individual materials, between sample and gasket, and peak pressures, in contrast to the 5-{micro}m-sized x-ray beams that are now becoming routine. The use of nanoscale x-ray beams also enables single-crystal x-ray diffraction studies in nominally polycrystalline samples at ultrahigh pressures, as demonstrated in measurements of (Mg,Fe)SiO{sub 3} postperovskite. These capabilities have potential for driving a push toward higher maximum pressures and further miniaturization of high-pressure devices, in the process advancing studies at extreme conditions.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); International Balzan Foundation; National Science Foundation Geophysics Grant
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 977372
- Report Number(s):
- ANL/XSD/JA-66753; PNASA6; TRN: US1002904
- Journal Information:
- Proc. Natl. Acad. Sci. U.S.A., Vol. 107, Issue 14 ; 2010; ISSN 0027-8424
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Diamond anvil cell behavior up to 4 Mbar
X-ray diffraction studies using diamond coated rhenium gasket to megabar pressures