Physics and Chemistry of Minerals

, Volume 37, Issue 7, pp 417–424

Heavy-ion irradiation on crystallographically oriented cordierite and the conversion of molecular CO2 to CO: a Raman spectroscopic study

  • Christian Weikusat
  • Ronald Miletich
  • Ulrich A. Glasmacher
  • Christina Trautmann
  • Reinhard Neumann
Original Paper

DOI: 10.1007/s00269-009-0343-x

Cite this article as:
Weikusat, C., Miletich, R., Glasmacher, U.A. et al. Phys Chem Minerals (2010) 37: 417. doi:10.1007/s00269-009-0343-x

Abstract

Crystallographically oriented sections of natural gemstone quality cordierite single-crystals have been irradiated with swift heavy ions of GeV energy and various fluences. Irradiation effects on the crystal lattice were investigated by means of Raman spectroscopy. Raman line scans along the trajectory of the ions reveal a close correlation of beam parameters (such as fluence and energy loss dE/dx along the ion path) to strain due to associated changes in lattice dimensions and defect concentration. The luminescence background also scales with the ion fluence and suggests the formation of point defects, which could also account for the macroscopically observable colouration of the irradiated samples. In addition, changes in the amount and nature of volatile species inside the structural channels are observed. They also scale with dE/dx and confirm the previously postulated irradiation-induced conversion of CO2 to CO. Irradiations along the crystallographic a-, b- and c-axis reveal no significant anisotropy effect with respect to lattice alterations. The polarisation characteristics of the Raman-active modes confirm the preferred molecular alignment of CO and CO2 along the a-axis direction.

Keywords

CordieriteRaman spectroscopySwift heavy ionsRadiation damageCarbon dioxideCarbon monoxide

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Christian Weikusat
    • 1
  • Ronald Miletich
    • 1
  • Ulrich A. Glasmacher
    • 1
  • Christina Trautmann
    • 2
  • Reinhard Neumann
    • 2
  1. 1.Institute of Earth SciencesUniversity of HeidelbergHeidelbergGermany
  2. 2.GSI HelmholtzzentrumDarmstadtGermany