Extended x-ray absorption fine structure of NaBr and Ge at high pressure
- 1 June 1980
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 51 (6), 3158-3163
- https://doi.org/10.1063/1.328064
Abstract
The x‐ray absorption spectra of Ge and of Br in NaBr have been measured to pressures of 52 and 21 kbars, respectively, in a boron carbide and diamond anvil cell in which pressure was measured via the ruby‐fluorescence technique. Although Bragg peaks from the diamond anvil reduced the accuracy, atomic spacings in both materials could be determined by extended x‐ray absorption fine‐structure (EXAFS) analysis. Changes in the nearest‐neighbor separations in NaBr, and Ge to at least 40 kbars, agreed with literature values, indicating that the EXAFS phase shifts are quite insensitive to such pressures. In addition the near‐edge peak positions in the NaBr spectra appeared to readily shift with pressure, which suggests that NaBr may be quite suitable as a pressure standard in future work of this type.Keywords
This publication has 17 references indexed in Scilit:
- Structure determination by X-ray absorptionContemporary Physics, 1978
- X-Ray Absorption at High PressurePhysical Review Letters, 1978
- EXAFS Measurement of High-Pressure Metallic Phase of GaAs by Use of a Diamond Anvil CellJapanese Journal of Applied Physics, 1978
- Extended x-ray-absorption fine-structure technique. II. Experimental practice and selected resultsPhysical Review B, 1975
- Miniature diamond anvil pressure cell for single crystal x-ray diffraction studiesReview of Scientific Instruments, 1974
- An Optical Fluorescence System for Quantitative Pressure Measurement in the Diamond-Anvil CellReview of Scientific Instruments, 1973
- Compressibility of 27 halides to 45 kbarJournal of Physics and Chemistry of Solids, 1971
- Versatile High Pressure Mössbauer ApparatusReview of Scientific Instruments, 1966
- Crystal Structures at High Pressures of Metallic Modifications of Silicon and GermaniumScience, 1963
- A New Dense Form of Solid GermaniumScience, 1963