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Non-crystalline thin films of Ge20Te80−xSbx (x = 0, 2, 4, 6, 10) systems were deposited on glass substrate using thermal evaporation technique. The optical coefficients were accurately determined by transmission spectra using Swanepoel envelope method in the spectral region of 400–1600 nm. The refractive index was found to increase from 2.38 to 2.62 with the corresponding increase in Sb content over...
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