The influence of the substitution of PbF2 with Al2O3 on physical, optical, and spectroscopic properties of multicomponent glasses

Glasses with oxy-fluorides have been the research trend in the past few years. Heavy metal fluoride-based glass materials are optically promising, because of their minimal phonon energies. This prompted the preparation of the glass composition (30−x)PbF 2 –xAl 2 O 3 –10Bi 2 O 3 –59B 2 O 3 –1MnO 2 , where ( x is in mole%, equal to 3, 6, 9, 12, and 15) via melt quenching method. The glasses are transparent still to test the amorphous nature XRD tests were done. Basic physical parameters, like density and molar volume, were carried out. The density is found to be decreased with Al 2 O 3 and is in accordance with theoretical density values. The metallization property of glass samples reveals that prepared glass samples are behaving as semiconductors in nature. From UV–VIS spectra, optical band gap energy and Urbach energies were obtained. It was observed that both optical energy and Urbach energies increased when increasing the content of Al 2 O 3 . No absorption band related to Mn 2+ is seen in the optical absorption spectra. Prominent absorption bands are seen in Fourier Transform Infrared and Raman spectra, revealing the existence of BiO 4 , BO 3 , AlO 4 , and BO 4 structural blocks. Resonance signals are observed in EPR spectra at g = 2.00, g = 2.73, g = 4.00, and g = 4.20. The values of g = 2.00, g = 4.00, and g = 4.20 in resonance are assigned to Mn 2+ ions that are situated in environments with greater proximity to octahedral symmetry and rhombic surroundings, respectively.