A comparable study of the EPR spectra and local structures for 3d 1 ‐ and 3d 9 ‐doped halo‐borate glasses

Abstract The spin Hamiltonian parameters (SHPs) of Cu 2+ ‐doped halo‐glasses PbX 2 –PbO–B 2 O 3 (X = F and Br) are investigated by means of the perturbation method where the impact of the halides and the local structure of the dopants, that is, the [CuO 6 ] 10− clusters suffering the tetragonal elongation distortions, is involved. By comparing with the obtained results of the 3d 1 system (VO 2+ ), Cu 2+ and V 4+ are complementary state, which show opposite distortions. Furthermore, the d‐d transition bands and the sign of anisotropy g factors also show whole opposite concentration variation trends with similar fluctuations due to the increase of non‐bridging oxygen (NBO). The values of the optical basicity Λ th referring to the Pauling electronegativity, whose influence on E 1 and g factors are also discussed. The above correlations would be beneficial to analyze and predict the properties of analogous borate glasses and ceramics when doped with different transition metal ions.