6533b7d9fe1ef96bd126c05e
RESEARCH PRODUCT
Optical absorption and Raman studies of neutron-irradiated Gd3Ga5O12 single crystals
Ilmo SildosG. ChikvaidzeR. ParejaNina Mironova-ulmaneJ.e. Muñoz-santiusteE. ElstsAnatoli I. PopovA. KareivaV. SkvortsovaEvgeni Vasil'chenkosubject
Nuclear and High Energy PhysicsMaterials scienceAnalytical chemistry02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesSpectral lineNeutron temperatureCrystalsymbols.namesakeImpurityAbsorption band0103 physical sciencessymbolsIrradiation010306 general physics0210 nano-technologyRaman spectroscopyAbsorption (electromagnetic radiation)Instrumentationdescription
Abstract In this work we have performed a comparative analysis of optical absorption and micro-Raman spectra for series of Gd3Ga5O12 (GGG) single crystals irradiated by fast neutrons with fluences from 1016 n/cm2 to 1018 n/cm2. It was found that the optical absorption spectra of non-irradiated Czochralski grown GGG consist of the relatively narrow lines in the UV spectral range related to the 4f–4f transitions in Gd3+. Transitions from the 6S7/2 ground state to the 6P, 6J and 6D states in a Gd3+ cation are clearly detected. For a GGG crystal containing Ca impurity ions, additional absorption band at 350 nm is observed, and it is tentatively ascribed to oxygen vacancies associated with Ca impurities. Several neutron-induced optical absorption bands, including ones related to F+ centres, were observed in fast neutron-irradiated Gd3Ga5O12 single crystals. Furthermore, clear evolution of the Raman spectra with neutron dose is also found. In particular, fine structure observed between 1350 and 1550 cm−1 is completely disappeared at high fluences, while several significant changes and the emergence of new transitions have been ascertained in spectral range of 100–850 cm−1.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-11-01 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |