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Physics and Chemistry of Minerals

, Volume 44, Issue 6, pp 389–401 | Cite as

Electron-beam-induced annealing of natural zircon: a Raman spectroscopic study

  • Tamás VácziEmail author
  • Lutz Nasdala
Original Paper

Abstract

The annealing of radiation damage in zircon by low-energy electron irradiation was explored systematically. Natural zircon samples spanning a wide range of self-irradiation damage were irradiated with the focused electron beam of an electron probe microanalyser. The effects of beam current and irradiation time were tested systematically, and the changes in zircon were measured using Raman spectroscopy. Our results confirm the damage-annealing effect of an accelerated electron beam. We demonstrate that non-thermal annealing occurs through electron-enhanced defect reactions and that the extent of the annealing is a function of both the irradiation time and the beam current. The complete annealing of radiation damage in zircon by an accelerated electron beam was not possible under the conditions of our experiments. Our results indicate that Raman band broadening in ion-irradiated zircon can possibly be explained through phonon confinement, as the estimated domain sizes of the crystalline volume amid recoil clusters decrease with increasing α dose. The results underlay the importance of doing Raman spectroscopy before electron-beam and ion-beam analysis. To avoid unwanted beam-induced annealing of damage in zircon during EPMA analysis, the electron energy transferred per volume unit of sample should be minimised, for instance by keeping the integrated charge low and/or by defocusing the electron beam.

Keywords

Zircon Raman spectroscopy Band broadening Radiation damage Electron-beam annealing 

Notes

Acknowledgements

Gem zircon samples were kindly made available by Wolfgang Hofmeister (Mainz) and Allen K. Kennedy (Perth), and the synthetic zircon crystal was provided by John M. Hanchar (St. John’s). Andreas Möller (Lawrence, KS) is thanked for the permission to use the Rogaland sample mounts in the present study. Sample preparation was done by Andreas Wagner (Vienna). We gratefully acknowledge the experimental assistance by Nora Groschopf (Mainz), Theodoros Ntaflos (Vienna), Ferenc Kristály and Norbert Zajzon (Miskolc), Reinhard Kaindl (Innsbruck), Gábor Varga, Zsolt Bendő and Péter Horváth (Budapest). Richard A. Ketcham is thanked for comments. We are indebted E. Schweizerbart Science Publishers for the permission to reproduce Fig. 6b. T.V. expresses his thanks for access to the research infrastructure in the Core Facility for Research and Instruments, Faculty of Science, Eötvös University (Budapest). This project has been supported by the National Research, Development and Innovation Office of Hungary Grant No. OTKA PD116183 to T.V., and by the Austrian Science Fund (FWF) Grant No. P24448–N19 to L.N.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of MineralogyEötvös Loránd UniversityBudapestHungary
  2. 2.Institut für Mineralogie und KristallographieUniversität WienViennaAustria

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