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 μ, and their temperature derivatives are:K s=134(4) GPa; μ=50.7(0.3) GPa; (∂K s/∂T) p =−0.024(0.005) GPa/K; and (∂μ/∂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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Isaak, D.G., Graham, E.K., Bass, J.D. et al. The elastic properties of single-crystal fayalite as determined by dynamical measurement techniques. PAGEOPH 141, 393–414 (1993). https://doi.org/10.1007/BF00998337
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DOI: https://doi.org/10.1007/BF00998337