Effect of silver iodide (AgI) on structural and optical properties of cobalt doped lead-borate glasses

Optical and dielectric properties of silver-substituted ZnAl2O4 spinels synthesized using a sol-gel auto-combustion method

“…The energy bandgap mainly comes from the charge jump from the valence band to the conduction band estimaed using Tauc's relationship: 28 ( F ( R ) hν ) = A ( hν − E g ) n where E g is the optical band gap energy of materials, A is a constant, hν is the photon energy, and n is a coefficient equal to either 1/2 for indirect band gap or 2 for direct band gap.…”

“…The metallization criterion ( M ) is usually used to predict the conductivity behavior of solids, where: 28 …”

Recycled and Nickel- or Cobalt-Doped Lead Materials from Lead Acid Battery: Voltammetric and Spectroscopic Studies

“…The IR band centered at 600 cm −1 derives from the overlaps of some contributions: IR spectra indicate the regions of the bands characteristic of different structural units in the vitroceramic structure. The IR band centered at 410 cm −1 implies the bending vibrations of the Pb-O-Pb/O-Pb-O angles from the [PbO 4 ] structural units [8,9]. For the samples with x = 0% prepared at 1000 • C and x = 5 mol% NiO prepared at 1050 • C, this band has the maximum intensity.…”

Structural and optical properties of barium titanium borate glasses doped with ytterbium

“…The deconvoluted spectrum of the base undoped glass (BTi-BaYb0) reveals eleven bands centered at 77 and 223 cm -1 due to vibrations of Ba 2? ions and Ti-O bonds, respectively [25,26], 418 and 1140 cm -1 due to vibrations of diborate groups [27,28], 540 and 901 cm -1 due to bending and stretching vibrations of orthoborate units, respectively [29,30], 794 cm -1 due to vibration of planar six membered borate rings containing one BO 4 tetrahedron [31], 1007 cm -1 due to asymmetric stretching modes of tetrahedral borate units [5], 1281 cm -1 due to vibration of pyroborate groups [31], 1413 cm -1 due to vibration of nonbridging oxygens from various B-O structural units [32], and 1488 cm -1 due to vibration of BO 2 Otriangles connected with other borate triangular units [30]. The addition of Yb 2 O 3 into host glass matrix with different ratios leads to the following modifications: (i) The formation of new bands in the range 707-736 cm -1 and 1502-1666 cm -1 due to the vibrations of B-O bonds in BO 4 units and metaborate rings, respectively [28,29,[33][34][35].…”