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Author Qian, Y.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS ♦ MINERALS ♦ STRUCTURAL CHEMICAL ANALYSIS ♦ SYNCHROTRON RADIATION ♦ USES ♦ STANDING WAVES ♦ MONOCRYSTALS ♦ CALCITE ♦ BRAGG REFLECTION ♦ X RADIATION ♦ X-RAY DIFFRACTION
Abstract Using x-ray standing waves (XSW) generated by dynamical Bragg diffraction, we have precisely measured lattice locations of trace elements within and at the surface of mineral single crystals. Natural calcite samples were cleaved along the (1014) plane to obtain pristine surfaces. After cleavage, some samples were reacted with a dilute aqueous Pb solution to obtain Pb-sorbed surfaces. XSW measurements were then performed on both unreacted and reacted samples using the calcite (1014) Bragg reflection. Results of these XSW measurements show that the naturally occurring trace element M substitutes for C. On the Pb-reacted calcite sample, Pb was located on the calcite (1014) lattice plane where C atoms also reside. Our measurements clearly demonstrate a new and powerful application of synchrotron radiation in earth and environmental sciences to provide element-specific atomic-scale structural information within and at the surface of minerals. The XSW measurements were made at the NSLS X15A and X25 beamlines. {copyright} {ital 1996 American Institute of Physics.}
ISSN 00346748
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Place United States
Journal Review of Scientific Instruments
Volume Number 67
Issue Number 9
Technical Publication No. CONF-9510119-


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