He+ ion implantation and electron irradiation effects on cathodoluminescence of plagioclase

Masahiro Kayama, Hirotsugu Nishido, Shin Toyoda, Kosei Komuro, Adrian A. Finch, Martin R. Lee, Kiyotaka Ninagawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Cathodoluminescence (CL) spectra of unirradiated, He+ ion-implanted and electron-irradiated plagioclase minerals contain the following emission bands: (1) below 300 nm due to Pb2+, (2) at ~320 and ~350 nm to Ce3+, (3) at 380-420 nm to Eu2+, Ti4+ and/or Al-O--Al/Ti defects, (4) at 560-580 nm to Mn2+ and (5) at 720-760 nm to Fe3+. During the implantation of He+ ion, much of their energy may be dissipated by partial destruction and strain of the feldspar framework, resulting in quenching of CL. Deconvolution of CL spectra acquired from albite and oligoclase reveals an emission component at 1.86 eV (666 nm) assigned to a radiation-induced defect center associated with Na+ atoms. As its intensity increases with radiation dose, this emission component has potential for geodosimetry and geochronometry. Electron irradiation causes Na+ migration in plagioclase, and then a considerable reduction in intensity of emissions assigned to impurity centers, which is responsible for an alteration in the energy state or a decrease in luminescence efficiency following the change of activation energy. Emission intensity at 1.86 eV positively correlates with electron irradiation time for unimplanted and He+ ion-implanted albite and oligoclase, but negatively for the implanted albite above 1.07 × 10-4 C/cm2. It implies that radiation halo produced by α-particles should not be measured using CL spectroscopy to estimate β radiation dose on albite in the high radiation level.

Original languageEnglish
Pages (from-to)531-545
Number of pages15
JournalPhysics and Chemistry of Minerals
Volume40
Issue number7
DOIs
Publication statusPublished - 2013 Jul 1
Externally publishedYes

Keywords

  • Cathodoluminescence
  • Electron irradiation
  • He ion implantation
  • Plagioclase
  • Radiation-induced defect center

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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    Kayama, M., Nishido, H., Toyoda, S., Komuro, K., Finch, A. A., Lee, M. R., & Ninagawa, K. (2013). He+ ion implantation and electron irradiation effects on cathodoluminescence of plagioclase. Physics and Chemistry of Minerals, 40(7), 531-545. https://doi.org/10.1007/s00269-013-0590-8