December 13, 2019
Dariush Souri

Dariush Souri

Academic rank: Associate professor
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Education: Ph.D in فیزیک
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Faculty: science

Research

Title Band gap determination by absorption spectrum fitting method (ASF) and structural properties of different compositions of (60-x) V2O5-40TeO2- x Sb2O3 glasses
Type Article
Keywords
Keywords: Composition Band structure Chalcogenides Optical properties Absorption
Journal JOURNAL OF NON-CRYSTALLINE SOLIDS
Researchers Dariush Souri

Abstract

Glasses with compositions (60x)V2O5–40TeO2–xSb2O3 with 0 6 x 6 10 (in mol%) have been prepared using usual melt quenching method. The position of the absorption edge and hence the values of the opti- cal band gap was found to depend on the glass composition. Using the Tauc model, the absorption spec- trum fitting method (ASF) was employed to obtain the optical band gap. This method requires only the measurement of the absorbance spectrum of the sample. For each sample, the width of the band tail was determined. Also, the density and glass transition temperature values indicate that the rigidity and pack- ing of the samples increase with increase in Sb2O3 concentration.