High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures
- Stony Brook Univ., NY (United States). Mineral Physics Institute
- Stony Brook Univ., NY (United States). Mineral Physics Institute; Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Princeton Univ., NJ (United States). Dept. of Geosciences
We report development of micro-focusing optics for high-energy x-rays by combining a sagittally bent Laue crystal monchromator with Kirkpatrick-Baez (K–B) X-ray focusing mirrors. The optical system is able to provide a clean, high-flux X-ray beam suitable for pair distribution function (PDF) measurements at high pressure using a diamond anvil cell (DAC). A focused beam of moderate size (10–15 μm) has been achieved at energies of 66 and 81keV. PDF data for nanocrystalline platinum (n-Pt) were collected at 12.5 GPa with a single 5 s X-ray exposure, showing that the in-situ compression, decompression, and relaxation behavior of samples in the DAC can be investigated with this technique. PDFs of n-Pt and nano Au (n-Au) under quasi-hydrostatic loading to as high as 71GPa indicate the existence of substantial reduction of grain or domain size for Pt and Au nanoparticles at pressures below 10 GPa. In conclusion, the coupling of sagittally bent Laue crystals with K–B mirrors provides a useful means to focus high-energy synchrotron X-rays from a bending magnet or wiggler source.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-98CH10886; NSF EAR 11-57758
- OSTI ID:
- 1259266
- Journal Information:
- Scientific Reports, Vol. 6; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Relativistic calculations on the ${{\rm{K}}}_{\alpha }$ x-ray satellites of platinum with multiply ionized L shell
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journal | November 2018 |
A simple correction for the parallax effect in X-ray pair distribution function measurements
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journal | September 2019 |
A simple correction for the parallax effect in X-ray pair distribution function measurements
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text | January 2019 |
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