Anisotropic Elasticity of Jarosite: A High-P Synchrotron XRD Study
The elastic properties of jarosite were investigated using synchrotron X-ray diffraction coupled with a multi-anvil apparatus at pressures up to 8.1 GPa. With increasing pressure, the c dimension contracts much more rapidly than a, resulting in a large anisotropy in compression. This behavior is consistent with the layered nature of the jarosite structure, in which the (001) [Fe(O,OH){sub 6}]/[SO{sub 4}] sheets are held together via relatively weak K-O and hydrogen bonds. Fitting of the measured unit-cell parameters to the second-order Birch-Murnaghan equation of state yielded a bulk modulus of 55.7 {+-} 1.4 GPa and zero-pressure linear compressibilities of 3.2 x 10{sup -3} GPa{sup -1} for the a axis and 13.6 x 10{sup -3} GPa{sup -1} for the c axis. These parameters represent the first experimental determination of the elastic properties of jarosite.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- DOE - OFFICE OF SCIENCE
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1019656
- Report Number(s):
- BNL-95548-2011-JA; AMMIAY; TRN: US201115%%296
- Journal Information:
- American Mineralogist, Vol. 95, Issue 1; ISSN 0003-004X
- Country of Publication:
- United States
- Language:
- English
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