In this work, the g factors, d-d transition band, local distortion, and their con-5 mol%) glasses are theoretically investigated by using perturbation formulas of g factors for a tetragonally compressed octahedral 3d 1 cluster. In the light of the cubic polynomial concentration functions for cubic field parameter D q , covalency factor N, and relative tetragonal compression ratio ρ, the calculated concentration dependences of d-d transition band and g factors for V 4+ show good agreement with the experimental data. With increasing x, N (≈0.7682-0.8165) displays the monotonously increasing trend, whereas ρ (≈6.5-4.2%) and D q (≈1504.9-1481.1 cm À1 ) exhibit the decreasing tendencies. The above concentration dependences can be ascribed to the modifications of the V 4+ -O 2À bonding and orbital admixtures around the impurity V 4+ due to the effects of V 2 O 5 doping on the stability of the glass network, the strength of local crystal fields, and the electron cloud distribution.

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