The elastic properties of single-crystal fayalite as determined by dynamical measurement techniques |
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Authors: | Donald G Isaak Earl K Graham Jay D Bass Hong Wang |
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Institution: | (1) Center for Chemistry and Physics of Earth and Planets, Institute of Geohysics and Planetary Physics, UCLA, 90024-1567 Los Angeles, CA, USA;(2) Azusa Pacific University, Azusa, USA;(3) Department of Geosciences, Pennsylvania State University, 16802 University Park, PA, USA;(4) Department of Geology, University of Illinois, 61806-2999 Urbana, IL, USA |
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Abstract: | We present new elasticity measurements on single-crystal fayalite and combine our results with other data from resonance, pulse superposition interferometry, and Brillouin scattering to provide a set of recommended values for the adiabatic elastic moduliC
ij and their temperature variations. We use a resonance method (RPR) with specimens that were previously investigated by pulse superposition experiments. The nineC
ij of fayalite are determined from three new sets of measurements. One set of our newC
ij data is over the range 300–500 K. We believe that the relatively large discrep ncies found in someC
ij are due in large part to specimen inhomogeneities (chemical and microstructural) coupled with differences in the way various techniques sample, rather than only systematic errors associated with experimental procedures or in the preparations of the specimens.Our recommendeaC
ij's (GPa) and (C
ij/T)
p
(GPa/K) are:
The resulting values for the isotropic bulk and shear moduli,K
s and , and their temperature derivatives are:K
s=134(4) GPa; =50.7(0.3) GPa; (K
s/T)
p
=–0.024(0.005) GPa/K; and (/T)
p
=–0.013(0.001) GPa/K. An important conclusion is thatK
s increases as the Fe/(Fe+Mg) ratio in olivine is increased. |
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Keywords: | Fayalite elastic moduli olivine resonance pulse-superposition Brillouin scattering |
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