title: Atomic displacement and disorder in LiNbO(3) single crystal caused by high-energy (3)He ion irradiation: an x-ray absorption spectroscopy study.
abstract: Nb K-edge x-ray absorption fine structure spectra from a single lithium niobate (LN) crystal irradiated with high-energy (3)He ions of 41 MeV and from unexposed crystal as the reference material are compared. The differences in the x-ray absorption near edge structure (XANES) spectra are interpreted by simulating Nb K-edge XANES spectra with the FEFF8.2 code. It is found that displacements of Nb and Li atoms, as well as Li and O vacancies, are likely to cause structural disorder leading to change in the refractive index of LN and to diminished birefringence. This finding is in agreement with previous results obtained from SRIM-2003 simulations and transmission electron microscopy measurements.
authors.affiliation: Institute of Physics, University of Bonn, Nußallee 12, 53115 Bonn, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Vitova
authors.forename: M R
authors.initials: MR
authors.lastname: Zamani-Meymian
authors.forename: K
authors.initials: K
authors.lastname: Peithmann
authors.forename: K
authors.initials: K
authors.lastname: Maier
authors.forename: J
authors.initials: J
authors.lastname: Hormes