caa a22 4500 467927650 CHVBK 20180406152934.0 cr unu---uuuuu 170328e20060201xx s 000 0 eng 10.1134/S0020168506020099 doi (NATIONALLICENCE)springer-10.1134/S0020168506020099 Abdukadyrova I. Institute of Nuclear Physics, Academy of Sciences of Uzbekistan, pos. Ulugbek, 702132, Tashkent, Uzbekistan aut Effect of neutron irradiation on the optical properties and lattice dynamics of α-SiO2 [Elektronische Daten] [I. Abdukadyrova] The effect of reactor irradiation on the IR reflectivity spectrum of α-SiO2 single crystals is studied in a broad range of fast-neutron fluences. Data are presented on the irradiation-induced changes in the spectral characteristics of antisymmetric and degenerate vibrational modes of bridge bonds and in dynamic parameters. Critical lattice dynamics is revealed near the antisymmetric stretching and degenerate modes. The ionic polarizability and dynamic constants of the crystals are shown to be nonlinear functions of neutron fluence. The results are interpreted in terms of radiation damage, a radiation-induced phase transition, and breaking and stretching of some of the silicon-oxygen bonds. A mechanism of radiation-induced structural changes is discussed. Pleiades Publishing, Inc., 2006 Inorganic Materials Nauka/Interperiodica 42/2(2006-02-01), 160-164 0020-1685 42:2<160 2006 42 10789 https://doi.org/10.1134/S0020168506020099 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0020168506020099 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Abdukadyrova I. Institute of Nuclear Physics, Academy of Sciences of Uzbekistan, pos. Ulugbek, 702132, Tashkent, Uzbekistan aut NATIONALLICENCE 773 0- Inorganic Materials Nauka/Interperiodica 42/2(2006-02-01), 160-164 0020-1685 42:2<160 2006 42 10789 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer