Anomalies of some physical properties and electrochemical performance of lithium–lead–germanate glasses

Compositional dependence of structure, optical and electrochemical properties of antimony(III) oxide doped lead glasses and vitroceramics

“…side indicating the increase in concentration of the nonbridging oxygen ions [23][24][25][26]. The enhancement of the number of non-bridging oxygen ions results in the shifting of the valence band maximum to higher energies and reduction of band gap, in agreement with the optical gap energy data.…”

Dielectric Characteristics and A.C. Conductivity of Pb3O4-Bi2O3-B2O3:CuO Glass Ceramics with CuBi2O4 Crystal Phase: A Possible Electrode Material for Ionic Batteries

“…Notably, BiO 3 pyramidal unit, belonging to C3ν point group symmetry, is expected to display four fundamental vibrations: ν 1 -symmetric stretching, ν 3doubly degenerate stretching, ν 2 -symmetric bending and ν 4 -doubly degenerate bending. [40][41][42][43][44] Nevertheless, in this particular investigation, only two vibrational bands were observed, viz., the ν 1 vibrational band within the 910-950 cm −1 region, as mentioned earlier, and the ν 2 vibrational band within the spectral region of 510-520 cm −1 . With an increase of CuO content gradually up to 0.8 mol%, the symmetrical stretching vibrational bands of BiO 3 , BO 4 units and PbO 4 groups showed a gradual growth, along with shifting of the meta-centers towards lower wavenumbers.…”

“…It is also plausible that in the frequency range associated with the Pb(IV)-O bond vibrations, there could be the presence of Bi-O bending vibrational band of BiO 6 units. [40][41][42][43][44] Interestingly, an additional band attributed to the symmetric stretching vibrations (ν 1 ) of BiO 3 pyramidal units within the wavenumber range of 910-950 cm −1 was observed. Notably, BiO 3 pyramidal unit, belonging to C3ν point group symmetry, is expected to display four fundamental vibrations: ν 1 -symmetric stretching, ν 3doubly degenerate stretching, ν 2 -symmetric bending and ν 4 -doubly degenerate bending.…”

Spectroscopic features of Ni2+ ion in PbO–Bi2O3–SiO2 glass system

“…In addition a band predicted due to Bi-O bending vibrations of BiO 6 units is also observed at about 550cm -1 [41][42][43][44][45]. Additionally, at about 450 cm -1 , a band due to PbO 4 vibrations is also located in these spectra [46].…”