Static elasticity of cordierite I

Author(s)

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

Abstract

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(s)

Department of Mineralogy and Crystallography

External organisation(s)

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

Journal

Physics and Chemistry of Minerals

Volume

41

Pages

579-591

No. of pages

13

ISSN

0342-1791

DOI

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

Publication date

04-2014

Peer reviewed

Yes

Austrian Fields of Science 2012

105116 Mineralogy, 105113 Crystallography

Keywords

ASJC Scopus subject areas

Geochemistry and Petrology, General Materials Science

Portal url

https://ucrisportal.univie.ac.at/en/publications/58e2531d-2526-45cb-818f-534dcfa9003b