Structural and optical features of aluminum lead borate glass doped with Fe2O3

Fe2O3-doped aluminum lead borate glass was synthesized using the melt-quenching technique with a chemical compositional of 55B2O3-30Pb3O4- $$\left( {15 - x} \right)$$ Al2O3− $$x$$ Fe2O3, $${\text{where}} x \left( {0 \le x \le 5} \right)$$ . X-ray diffraction was used to confirm the nature of this glass. The structural, optical, and dielectric properties of the glass were investigated. Transmittance and absorbance measurements were developed to establish and investigate the optical characteristics of these samples. The fundamental absorption edge shifted toward lower photon energy concerning the concentration of Fe2O3. The absorption coefficient, optical band gap, Urbach tail, steepness, and skin depth of the glass were estimated and discussed. The obtained result revealed that an indirect optical energy band gap Eg was decreased from 2.67 to 2.04 eV; meanwhile, it decreased from 3 to 2.31 eV in a direct transition. While the Urbach energy Eu was increased from 0.21 to 0.36 electron Volt. The extinction coefficient, refractive index, and optical and electrical conductivities of the glass were discussed as functions of Fe2O3 content. The real and imaginary parts of the dielectric constant were examined. Further physical constants like λcut-off, $$\mathrm{tan}\delta$$ , molar reflectivity, molar polarizability, and others were investigated.