On some d1 ions spectra in oxide glasses

Research on the Optical and EPR Spectral Data and the Local Structure for the Tetragonal Nb4+Center in Glasses

“…[14] are very close to those in Ref. [13]. In addition, the observed hyperne structure constants A and A ⊥ were given in Ref.…”

“…The measurements suggested that there is a tetragonallycompressed Nb 4+ octahedral center in these glasses with the ground state 2 B 2 (|d x,y ). The g factors g , g ⊥ and two optical bands assigned to E 1 ( 2 B 2 2 B 1 ) and E 2 ( 2 B 2 2 E) were given for this Nb 4+ center [13]. The EPR spectra of similar tetragonally-compressed Nb 4+ octahedral center in glass with niobium oxide were also studied by Aleksandrov et al [14].…”

“…Since the spectroscopic techniques can provide some information on the oxidation states and structures of these d n and 4f n impurity centers in glasses, many spectroscopic studies have been made for these doped glasses [914]. The optical and electron paramagnetic resonance (EPR) spectra of Nb-doped oxide glasses were measured [13]. The measurements suggested that there is a tetragonallycompressed Nb 4+ octahedral center in these glasses with the ground state 2 B 2 (|d x,y ).…”

Impedance spectroscopy and dielectric relaxation in alkali tungsten borate glasses

“…Staske et al have reported that in these glasses W 5+ :W 6+ ratio increases slightly from zero for x > 0.20 [12]. Goldstein et al have reported that in binary sodium borate and sodium silicate glasses, the presence of W 6+ is predominant [20]. In the present study, the sample preparation has been carried out at 1473 K (30 min) and therefore it is assumed that only W 6+ ions are present and conductivity is ionic in nature.…”

Influence of WO3 on some physical properties of MO–Sb2O3–B2O3 (M=Ca, Pb and Zn) glass system

“…Fig. 11(a) shows typical ESR signals (recorded at room temperature) of CaO-Sb 2 O 3 -B 2 O 3 :WO 3 glasses; the spectra of glass CSBW 10 exhibited an asymmetric signal (signal 1) at g ⊥ = 1.73 and g || = 1.60 identified due to W 5+ ions [15], and another signal (signal 2) which is typical for oxygen (paramagnetic O − ions) defects [16]. The signal is found to be feeble in the spectra of glasses doped with 0.2 and 0.4 mol% WO 3 in all the three series.…”