Static elasticity of cordierite I

Autor(en)

Ronald Miletich-Pawliczek, Katharina Sarah Scheidl, Martin Schmitt, Angela-Patricia Moissl, Thomas Pippinger, Giacomo Diego Gatta, Beatrice Schuster, Christina Trautmann

Abstrakt

The effect of ion beam irradiations on the elastic properties of hydrous cordierite was investigated by means of Raman and X-ray diffraction experiments. Oriented single crystals were exposed to swift heavy ions (Au, Bi) of various specific energies (10.0-11.1 MeV/u and 80 MeV/u), applying fluences up to 5 × 10

¹³ions/cm

². The determination of unit-cell constants yields a volume strain of 3.4 × 10

^-3up to the maximum fluence, which corresponds to a compression of non-irradiated cordierite at ~480 ± 10 MPa. The unit-cell contraction is anisotropic (e

₁= 1.4 ± 0.1 × 10

^-3, e

₂= 1.5 ± 0.1 × 10

^-3, and e

₃= 7 ± 1 × 10

^-4) with the c-axis to shrink only half as much as the axes within the ab-plane. The lattice elasticity for irradiated cordierite (φ{symbol} = 1 × 10

¹²ions/cm

²) was determined from single-crystal XRD measurements in the diamond anvil cell. The fitted third-order Birch-Murnaghan equation-of-state parameters of irradiated cordierite (V

₀= 1548.41 ± 0.16 Å

³, K

₀= 117.1 ± 1.1 GPa, ∂K/∂P = -0.6 ± 0.3) reveal a 10-11 % higher compressibility compared to non-irradiated cordierite. While the higher compressibility is attributed to the previously reported irradiation-induced loss of extra-framework H

₂O, the anomalous elasticity as expressed by elastic softening (β

_a

^-1, β

_b

^-1, β

_c

^-1= 397 ± 9, 395 ± 28, 308 ± 11 GPa, ∂(β

^-1)/∂P = -4.5 ± 2.7, -6.6 ± 8.4, -5.4 ± 3.0) appears to be related to the framework stability and to be independent of the water content in the channels and thus of the ion beam exposure.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Leopold-Franzens-Universität Innsbruck, Technische Universität Darmstadt, GSI Helmholtzzentrum für Schwerionenforschung, Areva GmbH, Universität Heidelberg, Università degli Studi di Milano-Bicocca

Journal

Physics and Chemistry of Minerals

Band

41

Seiten

579-591

Anzahl der Seiten

13

ISSN

0342-1791

DOI

https://doi.org/10.1007/s00269-014-0671-3

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/58e2531d-2526-45cb-818f-534dcfa9003b