Effect of antimony on the optical and physical properties of Sb-V2O5-TeO2 glasses

Abstract

Ternary glass systems of the form xSb-(60-x) V2O5-40TeO2 (Sx glasses) with 0 ≤ x ≤ 15 (in mol. %) have been prepared by using the normal melt quenching technique. The optical absorption spectra of these glasses have been recorded within wavelength range of 190 -1100 nm. The absorption spectrum fitting method was employed to obtain the energy band gap. In this method, only the measurement of absorbance spectrum of the glass is needed. The position of the absorption edge and therefore the optical band gap values were found to be depend on glass composition. Results show that the optical band gap is in the range 1.57 -2.14 eV. For each sample, the width of the band tail was determined. The densities of present glasses were measured and the molar volumes were calculated. Also, some thermal properties such as glass transition temperature (Tg) and crystallization temperature (TCr) were obtained by using differential scanning calorimetry (DSC) technique, and from which the glass thermal stability S and glass forming tendency Kgl were calculated. Results show that these glasses (specially for x ≥ 10 mol. %) have good stability and therefore good resistance against thermal shocks for technological applications in fiber devices. Also, Tg values indicate the rigidity and packing of the samples increase with increasing the Sb concentration as a network modifier.

The study of glass transition temperature in Sb–V2O5–TeO2 glasses at different heating rates

“…Results of thermal stability parameter are in agreement with the data of glass-forming tendency [44]. In brief, the higher thermal stability leads to the closepacked structure [44]. As discussed earlier, crystalline peaks in the XRD pattern for S12 are attributed to microcrystalline phases embedded in amorphous matrix.…”

“…The values of T S have been reported in our previous work for the present samples [44], which indicate the highest thermal stability for S12. Results of thermal stability parameter are in agreement with the data of glass-forming tendency [44]. In brief, the higher thermal stability leads to the closepacked structure [44].…”

“…Also, a useful parameter can be used for investigating the stability of these glasses. This parameter is thermal stability T S = T cr -T g [44]. The values of T S have been reported in our previous work for the present samples [44], which indicate the highest thermal stability for S12.…”

“…This parameter is thermal stability T S = T cr -T g [44]. The values of T S have been reported in our previous work for the present samples [44], which indicate the highest thermal stability for S12. Results of thermal stability parameter are in agreement with the data of glass-forming tendency [44].…”

Optical and Thermal Properties of Some Tellurite Glasses

“…In Tauc's method [11,12], absorption coefficient (α) requires measurement of the absorbance, reflectance, and thickness of the film. Recently, the absorption spectrum fitting method (ASF) and derivation of absorption spectrum fitting (DASF) methods have been introduced to obtain the band gap avoiding the film thickness measurement which commonly could not be measured precisely [13,14]. Also, tellurite glasses with high thermal and glass stabilities were suggested as potential materials to realize highly efficient fibers [15][16][17][18][19][20].…”