Measurements of the optical and thermal properties of Bi2O3–SiO2 glass producing fibers with zero photoelasticity

Theoretical investigations on the defect structures and g factors for V4+ in 30PbO‐5Bi2O3‐(65‐x)SiO2 glasses at different concentrations

“…Nevertheless, the moderate tetragonal compression ratio (~5%) can be ascribed to the relatively stable network structure of the glass systems. The similar Fourier type concentration functions in Equation ) for D q , N , and ρ show largely consistent variation tendencies (overall decreasing rules with some fluctuations, i.e., first increase and then decrease) with x (see Table 1), suitably accounting for the concentration dependences of the measured optical absorption and EPR results. [ 10 ] First, the largely declining covalency factor N with x based on Equation ) (also shown in Table 1) indicates the increasing covalency or V 4+ ‐O 2− orbital admixtures on the whole. Under the increase of V 2 O 5 concentration, the electron cloud density around the impurity V 4+ may increment due to the increasing concentration of non‐bridge oxygen (NBO).…”

“…[7] Particularly, Bi 2 O 3 can be added to form bismuth silicate glasses and exhibit the unique characteristics of high transparency, density and electrical polarizability, [4,8,9] which are suitable for nonlinear optical [4] and infrared transmission devices due to the high polarizability of Bi 3+ . [10][11][12] In this glass system, Bi 2 O 3 acts as a kind of glass former, together with SiO 2 , to construct the network of Bi 2 O 3 pyramid units. [13,14] Moreover, PbO may also be added to form lead bismuth silicate glasses and significantly improve the durability, refractive index and density of the systems by enhancing the stability of the BiO 3 pyramid network with the lone pair electrons outside the closed orbitals for both Bi 3+ and Pb 2+ .…”