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- Title
Small-angle neutron scattering study of radiation-induced defects in synthetic quartz.
- Authors
Lebedev, V. M.; Lebedev, V. T.; Orlov, S. P.; Pevzner, B. Z.; Tolstikhin, I. N.
- 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.
- Subjects
QUARTZ crystals; SMALL-angle scattering; NEUTRON scattering; NEUTRON irradiation; CRYSTAL defects; ATOMIC structure; FAST neutrons; CRYSTALLOGRAPHY
- Publication
Crystallography Reports, 2006, Vol 51, pS16
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774506070042