High-pressure X-ray diffraction study of ɛ-FeOOH
Abstract
An in situ synchrotron X-ray diffraction study was carried out on ɛ-FeOOH at room temperature up to a pressure of 8.6 GPa using the energy-dispersive method. The linear compressibility was determined to be β a = 1.69(3) × 10-3 GPa-1, β b = 2.86(6) × 10-3 GPa-1, and β c = 1.73(5) × 10-3 GPa-1. The b-axis of the unit cell is more compressible than the a and c axes. The pressure-volume data were fitted to a third-order Birch-Murnaghan equation of state. The best fit was found using a room temperature isothermal bulk modulus of K 0 = 126(3) GPa and its pressure derivative K' = 10(1).
- Publication:
-
Physics and Chemistry of Minerals
- Pub Date:
- March 2010
- DOI:
- 10.1007/s00269-009-0319-x
- Bibcode:
- 2010PCM....37..153S
- Keywords:
-
- High pressure;
- X-ray diffraction;
- Equation of state;
- Synchrotron radiation