Single-Crystal Elasticity of Zoisite, Ca2Al3Si3O12(OH) , by Brillouin Scattering
The single-crystal elastic constants of zoisite Ca{sub 2}Al{sub 3}Si{sub 3}O{sub 12}(OH) were determined by Brillouin scattering at ambient conditions. The elastic tensor was obtained by an inversion of acoustic velocity data for three different crystal planes. The aggregate bulk modulus, shear modulus, and Poisson's ratio are K{sub S0} = 125.3(4) GPa, G{sub 0} = 72.9(2) GPa, and {sigma}{sub 0} = 0.26(1) for the VRH (Voigt-Reuss-Hill) average, respectively. The maximum azimuthal anisotropy of zoisite is 22% for compressional velocity and 33% for shear velocity. The maximum shear splitting is 21% along the [001] direction. Our results resolve the discrepancies in bulk modulus and axial compressibilities reported from static compression studies, and provide the first experimental constraints on the shear modulus. Trends in the elastic moduli of minerals in the CaO-Al{sub 2}O{sub 3}-SiO{sub 2}-H{sub 2}O (CASH) system are evaluated.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 930427
- Report Number(s):
- BNL--81168-2008-JA
- Journal Information:
- American Mineralogist, Journal Name: American Mineralogist Vol. 92; ISSN AMMIAY; ISSN 0003-004X
- Country of Publication:
- United States
- Language:
- English
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