EXAFS MEASUREMENT UNDER HIGH PRESSURE BY DIAMOND ANVIL CELL

EXAFS spectra of materials under high pressure were successfully obtained for K-absorption edges of Fe, Co and Ni atoms by making use of synchrotron radiation together with the diamond anvil cell technique. A newly developed goniometer stage with a remote controlled motor was found to be useful for adjusting the position of a miniature diamond anvil cell for an X-ray beam. The present study revealed that an experimental system consisting of a Si(111) monochromator, a scintillation counter and a pair of normal 1/8 carats diamond anvils worked well for the measurement of Fe, Co and Ni atoms. For further measurement of absorption spectra of atoms with lower atomic number than Fe, a specially designed thinner diamond anvil or higher brightness synchrotron radiation source would be required