Characterization of lattice strain induced by neutron irradiation |
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| Authors: | Hsin-Yi Tseng Peter J Heaney T C Onstott |
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| Institution: | 1. Department of Geological and Geophysical Sciences, Princeton University, 08544-1003, Princeton, NJ, USA
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| Abstract: | Powder X-ray diffraction and Rietveld refinement have been used to study structural damage induced by neutron irradiation of orthoclase (Or94) from Benson Mines, New York. X-ray diffraction profiles of samples exposed to total neutron doses in excess of 6.3×1018 n/ cm2 exhibit small but measurable peak broadening in comparison with unirradiated orthoclase. Rietveld structure refinements and transmission electron microscope observations indicate that the X-ray peak broadening arises primarily from the effect of strain rather than particle size. The results reveal a positive correlation between the neutron dose and the anisotropic strain percentage calculated from the Lorentzian profile parameters. This strain-induced broadening probably stems from numerous point defects created by recoiling atoms during neutron collisions. These observations have important implications for the diffusive behavior of 39Ar and 40Ar. |
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