Abstract
Glass samples in the system of (P2O5)75-(CuO)25-x-(CdO)x/(P2O5)75-(CuO)25-x-(ZnO)x/(P2O5)75-(CuO)25-x-(V2O5)x/(P2O5)50-(TeO2)50-x-(CdO)x/(P2O5)50-(TeO2)50-x-(ZnO)x and (P2O5)50-(TeO2)50-x-(V2O5)x glasses of different compositions where (x = 0, 5, 10, 15,20) were prepared by the melt-quenching technique. Optical absorption spectra of different compositions were recorded in the visible and UV regions and optical parameters such as optical energy gap (Eopt) and band tails (Eo) were determined by Urbach formula, the measurements for phosphate glasses of optical energy gap (Eopt) (P2O5)75-(CuO)25-x-(CdO)x have been determined and founded between (3.75-4.185) eV, (P2O5)75-(CuO)25-x-(ZnO)x the value of optical energy gap is between (3.75-4.25)eV, (P2O5)75-(CuO)25-x-(V2O5)x the (Eopt) is between (3.75-4.2)eV. for tellurite glasses the measurements of optical energy gap (Eopt) of (P2O5)50-(TeO2)50-x-(CdO)x have been determined and founded between (3.825-4.25)eV, (P2O5)50-(TeO2)50-x-(ZnO)x the (Eopt) is between (4.035-4.2)eV, (P2O5)50-(TeO2)50-x-(V2O5)x the value of optical energy gap is between (3.875-4.335)eV, It was found that the fundamental absorption of these glasses is dependent upon compositions and arises from forbidden indirect transitions. The most satisfactory results were obtained with the theory Davis and Mott for forbidden indirect transitions
Highlights
Glass can be made with excellent homogeneity in a variety of forms and sizes such as rod tubes, sheets, plates... etc; from small fibers to meter-sized pieces
In the 21st century, scientists observing the properties of ancient stained glass windows, in which suspended nano particles prevent UV light from causing chemical reactions that change image colors, are developing photographic techniques that use similar stained glass to capture true color images of Mars for the 2019 ESA Mars Rover mission[3]
Where It and Io are the intensities of the incident and transmitted beams respectively,corrected for any reflection at the first surface, and d is the thickness of the sample Optical absorption Edges measurements for Six groups of (P2O5)75-(CuO)25-x-(CdO)x / (P2O5)75-(CuO)25-x–(ZnO)x / (P2O5)75-(CuO)25-x-( V2O5)x / (P2O5)50-(TeO2)50-x–(CdO)x / (P2O5)50-(TeO2)50-x-(ZnO)x and (P2O5)50-( TeO2)50-x- (V2O5)x glasses of different compositions (x = 0, 5, 10, 15, 20) made as a function of photon energy at room temperature
Summary
Glass can be made with excellent homogeneity in a variety of forms and sizes such as rod tubes, sheets, plates... etc; from small fibers to meter-sized pieces. Glass samples in the system of (P2O5)75-(CuO)25-x-(CdO)x/(P2O5)75-(CuO)25-x(ZnO)x/(P2O5)75-(CuO)25-x-(V2O5)x/(P2O5)50-(TeO2)50-x-(CdO)x/(P2O5)50-(TeO2)50-x-(ZnO)x and (P2O5)50-(TeO2)50-x-(V2O5)x glasses of different compositions where (x = 0, 5, 10, 15,20) were prepared by the melt-quenching technique.
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