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چکیده
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In the present research, the effect of Antimony and Arsenic components on structural and optical properties of Ge40Se60 glass has been deliberated. For this aim, Ge40-xSe60Asx and Ge40-xSe60Sbx (5 ≤ x ≤ 25) bulk glasses were ready by the conventional melt and quenching method in fused-silica ampoule. Analysis such as infrared transmittance, bandgap energy, glass transition temperature, density, hardness, and refractive index of the samples was determined. Results show that a fully amorphous state can create in Ge40-xSe60Asx and Ge40- xSe60Sbx (5 ≤ x ≤ 25) systems. With rising Antimony and Arsenic contents, the amount of hardness and glass transition temperature of the glassy samples were decreased. The Infrared transparency of the Antimony-substituted glasses was in direct relation to Sb content and reduced to about zero in the Se60Ge15Sb25 system. The addition of As to the glass composition up to 20 mol % has a negligible effect on IR transparency of the Se-Ge-As system. By adding Arsenic to glass composition, the Eg decreased and reached to about 1.6 eV in Se60Ge15As25. The Eg of glasses reduces to zero by enhancement of Sb content up to 25 mol%. With increasing Antimony and Arsenic contents, the refractive index of the glassy samples was increased. The higher refractive index of Ge-Se- Sb glasses can be associated with a higher ΔP value of Sb-substituted glasses. With increasing As content, the bond strength of Ge2Se3 decreases, and the intensity of GeSe2 and As(Se1/2)3 bonds increases. So, all GeSe2 bonds are moved to a lower wavelength.
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