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The pressure and temperature dependence of the elastic properties of single-crystal fayalite Fe2SiO4

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Abstract

The nine adiabatic elastic stiffness constants of synthetic single-crystal fayalite, Fe2SiO4, were measured as functions of pressure (range, 0 to 1.0 GPa) and temperature (range, 0 to 40° C) using the pulse superposition ultrasonic method. Summary calculated results for a dense fayalite polycrystalline aggregate, based on the HS average of our single-crystal data, are as follows: Vp = 6.67 km/s; Vs = 3.39km/s; K= 127.9 GPa; μ = 50.3 GPa; (∂K/∂P)T = 5.2; (∂μ/∂P)T=1.5;(∂K/∂T)P= −0.030 GPa/K;and,(∂/∂T)P =-0.013 GPa/K (the pressure and temperature data are referred to 25° C and 1 atm, respectively). Accuracy of the single-crystal results was maintained by numerous cross and redundancy checks.

Compared to the single-crystal elastic properties of forsterite, Mg2SiO4, the fayalite stiffness constants, as well as their pressure derivatives, are lower for each of the on-diagonal (C ij for which i=j) values, and generally higher for the off-diagonal (C ij for which i≠j) data. As a result, the bulk moduli (K) and dK/dP for forsterite and fayalite are very similar, but the rigidity modulus (μ) and dμ/dP for polycrystalline fayalite are much lower than their forsterite counterparts. The bulk compression properties derived from this study are very consistent with the static-compression x-ray results of Yagi et al. (1975). The temperature dependence of the bulk modulus of fayalite is somewhat greater (in a negative sense) than that of forsterite. The rigidity dependencies are almost equivalent. Over the temperature range relevant to this study, the elastic property results are generally consistent with the data of Sumino (1978), which were obtained using the RPR technique. However, some of the compressional modes are clearly discrepant. The elastic constants of fayalite appear to be less consistent with a theoretical HCP model (Leibfried 1955) than forsterite, reflecting the more covalent character of the Fe-O bonding in the former.

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Authors and Affiliations

  1. Department of Geosciences and Materials Research Laboratory, The Pennsylvania State University, 16802, University Park, Pennsylvania, USA

    E. K. Graham, J. A. Schwab & S. M. Sopkin

  2. The Research Institute for Iron, Steel, and Other Metals, Tohoku University, Sendai, Japan

    H. Takei

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  1. E. K. Graham
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  2. J. A. Schwab
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  3. S. M. Sopkin
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  4. H. Takei
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Graham, E.K., Schwab, J.A., Sopkin, S.M. et al. The pressure and temperature dependence of the elastic properties of single-crystal fayalite Fe2SiO4 . Phys Chem Minerals 16, 186–198 (1988). https://doi.org/10.1007/BF00203203

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