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Title: Single-Crystal Elasticity of Zoisite, Ca2Al3Si3O12(OH) , by Brillouin Scattering

Abstract

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.

Authors:
; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930427
Report Number(s):
BNL-81168-2008-JA
Journal ID: ISSN 0003-004X; AMMIAY; TRN: US200904%%704
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: American Mineralogist; Journal Volume: 92
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACOUSTICS; ANISOTROPY; BRILLOUIN EFFECT; COMPRESSIBILITY; COMPRESSION; CRYSTAL STRUCTURE; ELASTICITY; EPIDOTES; MONOCRYSTALS; SHEAR; VELOCITY; national synchrotron light source

Citation Formats

Mao,Z., Jiang, F., and Duffy, T.. Single-Crystal Elasticity of Zoisite, Ca2Al3Si3O12(OH) , by Brillouin Scattering. United States: N. p., 2007. Web. doi:10.2138/am.2007.2329.
Mao,Z., Jiang, F., & Duffy, T.. Single-Crystal Elasticity of Zoisite, Ca2Al3Si3O12(OH) , by Brillouin Scattering. United States. doi:10.2138/am.2007.2329.
Mao,Z., Jiang, F., and Duffy, T.. Mon . "Single-Crystal Elasticity of Zoisite, Ca2Al3Si3O12(OH) , by Brillouin Scattering". United States. doi:10.2138/am.2007.2329.
@article{osti_930427,
title = {Single-Crystal Elasticity of Zoisite, Ca2Al3Si3O12(OH) , by Brillouin Scattering},
author = {Mao,Z. and Jiang, F. and Duffy, T.},
abstractNote = {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.},
doi = {10.2138/am.2007.2329},
journal = {American Mineralogist},
number = ,
volume = 92,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}