Abstract
Ab initio calculations of the impurity centers Tm\(^{2+}\) thulium and europium Eu\(^{2+}\) in SrCl\(_{2}\) and MeF\(_{2}\) (Me = Ca, Sr, Ba) were carried out at low (zero) temperature. The crystal structure of impurity centers was investigated. Charge density maps show that the bonds formed by the rare-earth ions have an ionic character. The crystal structures, lattice dynamics, and band structures of MeF\(_{2}\) and SrCl\(_{2}\) were calculated at low temperature. Ab initio calculations were performed in periodic CRYSTAL code within the framework of the MO LCAO approach by using hybrid DFT functionals.
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The authors gratefully acknowledge the financial support from the Ministry of Education and Science of Russia under Project Nos. 3.571.2014/K
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Chernyshev, V.A., Serdcev, A.V., Petrov, V.P. et al. The Crystal Structure of Impurity Centers Tm\(^{2+}\) and Eu\(^{2+}\) in SrCl\(_{2}\): Ab Initio Calculations. J Low Temp Phys 185, 609–617 (2016). https://doi.org/10.1007/s10909-015-1458-8
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DOI: https://doi.org/10.1007/s10909-015-1458-8