Document Detail

Nanoprobe measurements of materials at megabar pressures.
MedLine Citation:
PMID:  20304801     Owner:  NLM     Status:  PubMed-not-MEDLINE    
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-microm-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(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.
Lin Wang; Yang Ding; Wenge Yang; Wenjun Liu; Zhonghou Cai; Jennifer Kung; Jinfu Shu; Russell J Hemley; Wendy L Mao; Ho-kwang Mao
Publication Detail:
Type:  Journal Article     Date:  2010-03-19
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  107     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-07     Completed Date:  2010-05-05     Revised Date:  2010-10-07    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6140-5     Citation Subset:  -    
High Pressure Synergetic Consortium, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, IL 60439, USA.
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