Electron Paramagnetic Resonance and Optical Absorption of VO2+ Doped Ammonium Selenate Single Crystals

摘要

An electron paramagnetic resonance study of vanadyl ions doped in ammonium selenate single crystals is carried out at room temperature. It is found that the VO2+ ion takes up an interstitial site. The spin Hamiltonian parameters obtained from the crystal rotations are g_‖ = 1.9576 ± 0.0002, g_⊥ = 1.9889 ± 0.0002, A_‖ = 203 ± 2 G, A_⊥ = 78 ± 2 G. An optical absorption study is also carried out to evaluate various bonding parameters. On the basis of these parameters the nature of bonding in the complex is discussed.