Small-angle neutron scattering study of radiation-induced defects in synthetic quartz |
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Authors: | Lebedev V M Lebedev V T Orlov S P Pevzner B Z Tolstikhin I N |
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Institution: | 1.Petersburg Nuclear Physics Institute,Russian Academy of Sciences,Gatchina, Leningrad oblast,Russia;2.OAO Laboratory of Glass Properties,St. Petersburg,Russia;3.Geological Institute, Kola Research Center,Russian Academy of Sciences,Apatity, Murmansk oblast,Russia |
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Abstract: | The supraatomic structure of single crystals of synthetic quartz was studied by thermal neutron small-angle scattering in the initial state (dislocation densities 54 and 570 cm?2) and after irradiation in the WWR-M reactor (Petersburg Nuclear Physics Institute) by fast neutrons with energies E
n
> 0.1 MeV at fluences F
n
= 0.2 × 1017 ?5 × 1018 neutrons/cm2. It is established that fast neutrons form point, linear, and volume defects in the lattice throughout the entire volume of a sample. Large-volume structures—amorphous-phase nuclei—reach sizes of ~100 nm in quartz, while occupying a small total volume of ~0.3% even at the maximum fluence 5 × 1018 neutrons/cm2. The main fraction of the damaged volume (up to 5%) corresponds to point (with a radius of gyration of 1–2 nm) and linear defects, giving a comparable contribution (~1–4%). The extended linear structures with a radius of 2 nm, even at a moderate fluence of 7.7 × 1017 neutrons/cm2, have a significant total length per volume unit (~1011 cm/cm3) and can form a connected network with a cell ~30 nm in size in the sample. Foreign atoms and molecules can migrate through channels of this network. |
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