Abstract
The electron paramagnetic resonance (EPR) g factor formulas for SnO2:Cr5+, SnO2:V4+ and TiO2:V4+ crystals are deduced from Jahn–Teller effect and contributions of the charge-transfer levels. The tetragonal distortions ΔR = −0.0283, −0.0091, and −0.0045 nm, and Δθ = 0°, −0.0335°, and −0.0010°, for SnO2:Cr5+, SnO2:V4+ and TiO2:V4+, respectively. The calculations of the g factors agree well with the experimental values. The contributions of the charge-transfer levels to g factors increase with the increasing valence state. It must be taken into account in the precise calculations of g factors for the high-valence state d1 ions in crystals.
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