Static elasticity of cordierite II
- Autor(en)
- Katharina Sarah Scheidl, Giacomo Diego Gatta, Thomas Pippinger, Beatrice Schuster, Christina Trautmann, Ronald Miletich-Pawliczek
- Abstrakt
Two natural CO2-?rich cordierite samples (1.00 wt?% CO2, 0.38 wt?% H2O, and 1.65 wt?% CO2, 0.15 wt?% H2O, resp.) were investigated by means of Raman spectroscopy and single-?crystal X-?ray diffraction at ambient and high pressures. The effect of heavy-?ion irradn. (Au 2.2 GeV, fluence of 1 × 1012 ions cm-?2) on the crystal structure was investigated to characterize the structural alterations complementary to results reported on hydrous cordierite. The linear CO2 mols. sustained irradn.-?induced breakdown with small CO2-?to-?CO conversion rates in contrast to the distinct loss of channel H2O. The max. CO2 depletion rate corresponds to ~12 ± 5 % (i.e. ~0.87 and ~1.49 wt?% CO2 according to the two samples, resp.)?. The elastic properties of CO2-?rich cordierite reveal stiffening due to the CO2 mols. (non-?irradiated: isothermal bulk modulus K0 = 120.3 ± 3.7 GPa, irradiated: K0 = 109.7 ± 3.7 GPa)?, but show the equiv. 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 exptl. 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.
- Organisation(en)
- Institut für Mineralogie und Kristallographie
- Externe Organisation(en)
- Technische Universität Darmstadt, GSI Helmholtzzentrum für Schwerionenforschung, Areva GmbH, Università degli Studi di Milano-Bicocca
- Journal
- Physics and Chemistry of Minerals
- Band
- 41
- Seiten
- 617-631
- Anzahl der Seiten
- 15
- ISSN
- 0342-1791
- DOI
- https://doi.org/10.1007/s00269-014-0675-z
- Publikationsdatum
- 04-2014
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105116 Mineralogie, 105113 Kristallographie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Geochemistry and Petrology, Allgemeine Materialwissenschaften
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/c5ad75c3-c3ed-42ce-959f-1c06d0aa6475