Ab Initio Study on the Vibrational and Electronic Properties of Radiation-Induced Defects in Potassium Bromide
Platonenko A. Pankratov V. Kotomin E.A. Dauletbekova A. Popov A.I.
February 2024Multidisciplinary Digital Publishing Institute (MDPI)
Crystals
2024#14Issue 2
The vibrational and electronic properties of several basic radiation defects in potassium bromide are computed at the quantum mechanical level using a periodic supercell approach based on hybrid functionals, an all-electron Gaussian-type basis set, and the Crystalcomputer code. The exciton energy in alkali halides is sufficient to create lattice defects, such as F–H Frenkel defect pairs, resulting in a relatively high concentration of single defects and their complexes. Here, we consider eight defects: the electronic (Formula presented.) - and F-centers (bromine vacancy without and with trapped electrons) and their dimers; hole H-center (neutral bromine atom forming the dumbbell ion with a regular (Formula presented.) ion.); (Formula presented.) -center ((Formula presented.) molecular ion consisting of a hole and two regular ions); and two complex (Formula presented.) defects, combinations of several simple defects. The local geometry and the charge- and spin-density distributions of all defects are analyzed. Every defect shows its characteristic features in Raman spectra, and their comparison with available experimental data is discussed.
alkali halides , electronic structure , F-type centers , hole centers , interstitial defects , KBr , Raman spectroscopy , vibrational properties
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Institute of Solid State Physics, University of Latvia, 8 Kengaraga Street, Riga, LV1063, Latvia
L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Institute of Solid State Physics
L.N. Gumilyov Eurasian National University
10 лет помогаем публиковать статьи Международный издатель
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