Abstract
The UV absorption spectra of beryl crystals exposed to fast neutrons with a fluence of 1014–1019 cm−2 are investigated. It is found that as the fluence of particles increases, a characteristic fan-shaped broadening of the long-wavelength edge is observed for the impurity adsorption band with a charge transfer. The experimental results are interpreted on the basis of the generalized Urbach rule in the approximation of an induced quasi-dynamic disorder. The effective cross section of radiation-induced lattice disordering in the crystals under investigation is estimated at a value (σ=2.58×10−18 cm2) close to the neutron amorphization cross sections for other crystalline silicates.
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Translated from Fizika Tverdogo Tela, Vol. 43, No. 2, 2001, pp. 237–241.
Original Russian Text Copyright © 2001 by Weinstein, Zatsepin, Kortov.
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Weinstein, I.A., Zatsepin, A.F. & Kortov, V.S. Quasi-dynamic structural disorder induced by fast neutrons in Be3Al2Si6O18 crystals. Phys. Solid State 43, 246–250 (2001). https://doi.org/10.1134/1.1349468
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DOI: https://doi.org/10.1134/1.1349468