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High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures

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) measure...

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Autores principales: Hong, Xinguo, Ehm, Lars, Zhong, Zhong, Ghose, Sanjit, Duffy, Thomas S., Weidner, Donald J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4763265/
https://www.ncbi.nlm.nih.gov/pubmed/26902122
http://dx.doi.org/10.1038/srep21434
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author Hong, Xinguo
Ehm, Lars
Zhong, Zhong
Ghose, Sanjit
Duffy, Thomas S.
Weidner, Donald J.
author_facet Hong, Xinguo
Ehm, Lars
Zhong, Zhong
Ghose, Sanjit
Duffy, Thomas S.
Weidner, Donald J.
author_sort Hong, Xinguo
collection PubMed
description 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 81 keV. 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 71 GPa indicate the existence of substantial reduction of grain or domain size for Pt and Au nanoparticles at pressures below 10 GPa. 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.
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spelling pubmed-47632652016-03-01 High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures Hong, Xinguo Ehm, Lars Zhong, Zhong Ghose, Sanjit Duffy, Thomas S. Weidner, Donald J. Sci Rep Article 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 81 keV. 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 71 GPa indicate the existence of substantial reduction of grain or domain size for Pt and Au nanoparticles at pressures below 10 GPa. 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. Nature Publishing Group 2016-02-23 /pmc/articles/PMC4763265/ /pubmed/26902122 http://dx.doi.org/10.1038/srep21434 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Hong, Xinguo
Ehm, Lars
Zhong, Zhong
Ghose, Sanjit
Duffy, Thomas S.
Weidner, Donald J.
High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures
title High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures
title_full High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures
title_fullStr High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures
title_full_unstemmed High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures
title_short High-energy X-ray focusing and applications to pair distribution function investigation of Pt and Au nanoparticles at high pressures
title_sort high-energy x-ray focusing and applications to pair distribution function investigation of pt and au nanoparticles at high pressures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4763265/
https://www.ncbi.nlm.nih.gov/pubmed/26902122
http://dx.doi.org/10.1038/srep21434
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