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Static elasticity of cordierite II: effect of molecular CO2 channel constituents on the compressibility

Scheidl, K. S. and Gatta, G. D. and Pippinger, T. and Schuster, B. and Trautmann, C. and Miletich, R. (2014):
Static elasticity of cordierite II: effect of molecular CO2 channel constituents on the compressibility.
In: Physics and Chemistry of Minerals, Springer Berlin Heidelberg, pp. 617-631, 41, (8), ISSN 0342-1791,
[Online-Edition: http://dx.doi.org/10.1007/s00269-014-0675-z],
[Article]

Abstract

Two natural CO2-rich cordierite samples (1.00 wt% CO2, 0.38 wt% H2O, and 1.65 wt% CO2, 0.15 wt% H2O, respectively) were investigated by means of Raman spectroscopy and single-crystal X-ray diffraction at ambient and high pressures. The effect of heavy-ion irradiation (Au 2.2 GeV, fluence of 1 x 10(12) ions cm(-2)) on the crystal structure was investigated to characterize the structural alterations complementary to results reported on hydrous cordierite. The linear CO2 molecules sustained irradiation-induced breakdown with small CO2-to-CO conversion rates in contrast to the distinct loss of channel H2O. The maximum CO2 depletion rate corresponds to similar to 12 +/- A 5 % (i.e. similar to 0.87 and similar to 1.49 wt% CO2 according to the two samples, respectively). The elastic properties of CO2-rich cordierite reveal stiffening due to the CO2 molecules (non-irradiated: isothermal bulk modulus K (0) = 120.3 +/- A 3.7 GPa, irradiated: K (0) = 109.7 +/- A 3.7 GPa), but show the equivalent effect of hydrous cordierite to get softer when irradiated. The degree of anisotropy of axial compressibilities and the anomalous elastic softening at increasing pressure agrees with those reported for hydrous cordierite. Nevertheless, the experimental high-pressure measurements using ethanol-methanol reveal a small hysteresis between compression and decompression, together with the noticeable effect of pressure-induced over-hydration at pressures between 4 and 5 GPa.

Item Type: Article
Erschienen: 2014
Creators: Scheidl, K. S. and Gatta, G. D. and Pippinger, T. and Schuster, B. and Trautmann, C. and Miletich, R.
Title: Static elasticity of cordierite II: effect of molecular CO2 channel constituents on the compressibility
Language: English
Abstract:

Two natural CO2-rich cordierite samples (1.00 wt% CO2, 0.38 wt% H2O, and 1.65 wt% CO2, 0.15 wt% H2O, respectively) were investigated by means of Raman spectroscopy and single-crystal X-ray diffraction at ambient and high pressures. The effect of heavy-ion irradiation (Au 2.2 GeV, fluence of 1 x 10(12) ions cm(-2)) on the crystal structure was investigated to characterize the structural alterations complementary to results reported on hydrous cordierite. The linear CO2 molecules sustained irradiation-induced breakdown with small CO2-to-CO conversion rates in contrast to the distinct loss of channel H2O. The maximum CO2 depletion rate corresponds to similar to 12 +/- A 5 % (i.e. similar to 0.87 and similar to 1.49 wt% CO2 according to the two samples, respectively). The elastic properties of CO2-rich cordierite reveal stiffening due to the CO2 molecules (non-irradiated: isothermal bulk modulus K (0) = 120.3 +/- A 3.7 GPa, irradiated: K (0) = 109.7 +/- A 3.7 GPa), but show the equivalent effect of hydrous cordierite to get softer when irradiated. The degree of anisotropy of axial compressibilities and the anomalous elastic softening at increasing pressure agrees with those reported for hydrous cordierite. Nevertheless, the experimental high-pressure measurements using ethanol-methanol reveal a small hysteresis between compression and decompression, together with the noticeable effect of pressure-induced over-hydration at pressures between 4 and 5 GPa.

Journal or Publication Title: Physics and Chemistry of Minerals
Volume: 41
Number: 8
Publisher: Springer Berlin Heidelberg
Uncontrolled Keywords: Cordierite, Molecular CO2, Heavy-ion irradiation, Equation-of-state, Comparative static compressibility, Pressure-induced over-hydration
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 12 Jan 2015 12:34
Official URL: http://dx.doi.org/10.1007/s00269-014-0675-z
Identification Number: doi:10.1007/s00269-014-0675-z
Funders: This work was supported by the University of Vienna under Grant Number BE532003 .
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