Lyu JR, Wu SY, Hong YJ, Wu H, Dong HN. Theoretical studies of the concentration dependences of d-d transition band, g factors, and local distortion for V
4+ in Li
2 O-PbO-B
2 O
3 -P
2 O
5 glasses.
MAGNETIC RESONANCE IN CHEMISTRY : MRC 2022;
60:398-406. [PMID:
34763372 DOI:
10.1002/mrc.5232]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 10/04/2021] [Accepted: 11/04/2021] [Indexed: 06/13/2023]
Abstract
In this work, the g factors, d-d transition band, local distortion, and their concentration dependences for impurity V4+ in 20Li2 O-20PbO-45B2 O3 -(15 - x)P2 O5 :V2 O5 (0 ≤ x ≤ 2.5 mol%) glasses are theoretically investigated by using perturbation formulas of g factors for a tetragonally compressed octahedral 3d1 cluster. In the light of the cubic polynomial concentration functions for cubic field parameter Dq , covalency factor N, and relative tetragonal compression ratio ρ, the calculated concentration dependences of d-d transition band and g factors for V4+ 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 Dq (≈1504.9-1481.1 cm-1 ) exhibit the decreasing tendencies. The above concentration dependences can be ascribed to the modifications of the V4+ -O2- bonding and orbital admixtures around the impurity V4+ due to the effects of V2 O5 doping on the stability of the glass network, the strength of local crystal fields, and the electron cloud distribution.
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