Abstract
AbstractThe results of studies of the absorption spectra of nickel orthoborate Ni_3(BO_3)_2 in the range of electronic d – d -transitions are reported. The obtained data are analyzed in the framework of the crystal field theory. The Ni^2+ ions are located in two crystallographically nonequivalent positions 2 a and 4 f with point symmetry groups C _2 h and C _2, respectively, surrounded by six oxygen ions forming deformed octahedra. The absorption spectra exhibit three intense bands corresponding to spin-resolved transitions from the ground state of nickel ion ^3 A _2 g (^3 F ) to the sublevels of the ^3 T _2 g (^3 F ), ^3 T _1 g (^3 F ) and ^3 T _1 g (^3 P ) triplets split by the spinorbit interaction and the rhombic component of the crystal field. At temperatures below 100 K, the spectra exhibit a thin structure, in which phonon-free lines can be distinguished. Comparison of the calculated frequencies of the zero-phonon transitions with the experimental data allows estimating parameters of the crystal field acting on the nickel ions in the 2 a - and 4 f -positions, as well as the parameters of electrostatic interaction between the 3 d electrons and spin-orbit interaction constants.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
