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Localized defects in radiation-damaged zircon

Rios1, Malcherek, Salje

  • 1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, England. rios@esc.cam.ac.uk.

Acta Crystallographica. Section B, Structural Science
|December 2, 2000
PubMed
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Radiation damage in zircon (ZrSiO4) causes anisotropic unit-cell swelling due to distorted ZrO8 polyhedra. This structural change impacts zirconium and oxygen atoms, while silica tetrahedra remain largely intact.

Area of Science:

  • Geochemistry
  • Materials Science
  • Crystallography

Background:

  • Natural zircon (ZrSiO4) is susceptible to structural damage from alpha decay.
  • Understanding radiation damage mechanisms is crucial for geological and materials science applications.

Purpose of the Study:

  • To determine the crystal structure of radiation-damaged natural zircon.
  • To investigate the effects of alpha decay on zircon's unit-cell parameters and atomic structure.

Main Methods:

  • Crystal structure determination of a natural zircon sample subjected to a high alpha-decay dose (1.8 x 10^18 events/g).
  • Analysis of unit-cell swelling and atomic displacement parameters.

Main Results:

  • Anisotropic unit-cell swelling observed: 0.17% along the a-axis and 0.62% along the c-axis.

Related Experiment Videos

  • Distortion primarily affects ZrO8 polyhedra and Zr/O atoms, indicated by larger displacement parameters.
  • SiO4 tetrahedra remain largely undistorted, with Si-O bonds lengthening by 0.43%.

    • Conclusions:

    • Alpha decay-induced defects preferentially distort ZrO8 polyhedra in zircon.
    • The observed anisotropic swelling is directly linked to the expansion anisotropy of these polyhedra.
    • Zircon's structural response to radiation damage is characterized by localized distortions around Zr and O atoms.