Nature of radiation defects in synthetic quartz according to the small-angle neutron scattering data |
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Authors: | V M Lebedev V T Lebedev S P Orlov B Z Pevzner I N Tolstikhin |
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Institution: | (1) Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, Leningradskaya oblast, 188300, Russia;(2) OAO Glass Property Laboratory, St. Petersburg, 199053, Russia;(3) Geological Institute, Kola Research Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184209, Russia |
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Abstract: | The supraatomic structure of single crystals of synthetic quartz in the initial state with a dislocation density of 570 cm?2 and after irradiation in the VVR-M reactor at the Petersburg Nuclear Physics Institute with fast neutrons having the energy E n > 1 MeV in the range of fluences F n = 7.7 × 1017 ?2.1 × 1020 neutrons/cm2 has been studied by small-angle scattering of thermal neutrons. It is established that fast neutrons form point, linear, and volume lattice defects throughout the entire sample volume. Large-volume structures (nuclei of the amorphous phase) in quartz, reaching ~100 nm in size, occupy a small total volume (~1.5%) even at the maximum fluence 2.1 × 1020 neutrons/cm2. The majority of damage is related to the point defects with the radius of gyration of 1–2 nm and linear defects, which give comparable contributions up to several percent. |
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