Theoretical and Structural Study of Axial Symmetry Ce(3+) Centers in the BaWO(4) Single Crystal Doped with Cerium and Codoped with Sodium Ions

The spin–Hamiltonian parameters g–factors ([Formula: see text] and [Formula: see text]) of the Ce(3+) paramagnetic centers in BaWO(4): Ce and BaWO(4): Ce, Na single crystals with axial symmetry are investigated using the superposition model (SPM) via complete diagonalization procedure of energy matrix (CDM method). The calculated g–factors are in reasonable agreement with the experimental values. The fitted intrinsic parameters are comparable with data from other publications for rare-earth paramagnetic centers in a similar environment. The angular distortions of the cerium dodecahedron [CeO(8)] are also studied. Structural analysis of paramagnetic centers with axial symmetry through the postulated cerium barium tetrahedron [CeBa(4)] connected via oxygens bridges was carried out. The mechanism of the charge compensation and the role of the second dopant (Na(+)) is also discussed.