Optical properties of the MoO3 - TeO2 glasses doped with Ni2Â +-ions

The binary MoO3 - TeO2 glasses doped with 0-0.5 mol% of Ni2 + ions were prepared by the melt-quenching technique using inorganic salts and acids as starting materials. The optical transmission spectra of all prepared glasses were studied in the wavelength range 0.5-6 μm. Two broad bands with maxima at 744 and 1318 nm are produced by octahedrally coordination nickel ions. The crystal field splitting energy and Racah parameters of Ni2 + ions were calculated by using the Tanabe-Sugano diagrams. The spectral dependence of the specific absorption coefficient of nickel was established and the value of the integral absorption coefficient in the wavelength range 0.6-2.8 μm was found as (14.5 ± 0.3) cm− 2/( ppmwt). The value of the optical band gap is observed to decrease while the refractive index and Urbach's energy increase with increase in the concentration of Ni2 + in the glasses.