This paper reports the influence of antimony (Sb) addition on the optical properties (optical energy gap and refractive index) of thin solid films of the chalcogenide glassy Ge0.17Se0.83−xSbx(x = 0, 0.03, 0.09, 0.12, 0.15) system. This has been done by analysing the transmittance (T) and reflectance (R) spectra in the spectral region 400–2000 nm. It was found that the optical energy gap decreases with increasing Sb content from 1.92 to 1.63 eV with an uncertainty of ± 0.01 eV. The results were interpreted in terms of bond energies and on the basis of the concept of electronegativity. The refractive index has been found to increase with increasing Sb content. The increase in the refractive index has been explained on the basis of polarizability. Dispersion of refractive index has been analysed using the Wemple–DiDomenico single oscillator model. The static refractive index increased from 2.45 to 2.91 for the studied compositions. An estimate of the energy gap has also been taken theoretically and it has been found that both the optical energy gap (measured from T and R spectra) and the theoretical energy gap follow similar trends.
Mn doped SnO 2 thin films were prepared by sol-gel dip coating technique. The deposited films on glass substrate were annealed at 300 o C, 400 o C and 500 o C. The effect of annealing temperature on the structure and optical properties of the Mn-SnO 2 thin films have been studied by X-ray diffraction and UV-Vis spectrophotometry. X-ray diffraction studies shows the tetragonal rutile structure of SnO 2 with no additional phases of SnO 2 . Various parameters like crystallite size, lattice constants, dislocation density and microstrain have been calculated and found to vary with annealing temperature. The optical transmission spectra shows a red shift in the position of absorption edge towards higher wavelength for Mn-doped thin films but as the annealing temperature increases, the absorption edge shifts toward lower wavelengths. The optical constants and the optical parameters were determined by the spectral transmittance data.
Sn 13 Se 87-x Sb x (x = 0, 3, 6, 9, 12) glassy system is synthesized by melt quench technique. This glassy system has been studied for various physical parameters viz. coordination number, lone pair of electrons, number of constraints, bond energy, heat of atomization, glass transition temperature, cohesive energy, band gap and mean bond energy. From the physical analysis it is generalized that the average number of constraints, average heat of atomization, mean bond energy, glass transition temperature and cohesive energy are found to increase whereas numbers of lone pair of electrons calculated are found to decrease with the increase in the antimony content in the composition of the alloy. The increase in glass transition temperature has been explicated on the basis of accumulation of antimony atoms in selenium chain.
Far infrared transmission spectra of Se92Te8−xSnx (x = 0, 1, 2, 3, 4, 5) glassy alloys are obtained in the spectral range 50–600 cm−1 at room temperature. The results are interpreted in terms of the vibrations of the isolated molecular units in such a way so as to preserve fourfold and twofold coordination for Sn and chalcogen atoms (Se,Te), respectively. With the addition of Sn, Far-IR spectra shift toward high frequency side and some new bands start appearing. Sn atoms appear to substitute for the selenium atoms in the outrigger sites due to large bond formation probability. Theoretical calculations of bond energy, relative probability of bond formation, force constant, and wave number were also made to justify the result.
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