Structural transformations in InSb crystals exposed to fast neutrons (with energies E > 0.1 MeV) and to full-spectrum reactor neutrons, with the ratio of the flux densities of slow and fast neutrons approximately equal to unity, were studied. It was shown that, with regard to the effect of fast neutrons on the lattice spacing, two portions could be distinguished in its dependence on the irradiation dose. At small fluences of fast neutrons (<2.5 x 1017/cm2), no increase in the lattice spacing was observed. As follows from the diffuse X-ray scattering data, in this range of fluences, the clusters of vacancies dissociate and the number of small-sized interstitial-type clusters increases. At F fn > 2.5 x 1017/cm2, the lattice spacing increases linearly with increasing fluences of neutrons, and numerous small-sized vacancy clusters and interstitial clusters capable of trapping the Sn dopant atoms were formed. Heat treatment of the exposed samples at up to 400C results in complete restoration of the lattice spacing.

Structural Changes Induced by Neutron Irradiation and Heat Treatments in InSb Single Crystals. V.M.Boĭko, V.T.Bublik, M.I.Voronova, N.G.Kolin, D.I.Merkurisov, K.D.Shcherbachev: Semiconductors, 2006, 40[7], 749-57