Synthesis and Optical Investigations on (Ba,Sr)TiO₃ Borosilicate Glasses Doped with La₂O₃

In this research paper we are reporting synthesis, structural and optical investigations of barium strontium titanate borosilicate glasses with addition of La 2 O 3 .Glasses were synthesized by conventional rapid melt quench method.Infrared absorption spectra, for various (Ba,Sr)TiO 3 borosilicate glass samples having glass system 64[(Ba 1-x Sr x )TiO 3 ]-35[2SiO 2 -B 2 O 3 ]-5[K 2 O]-1[La 2 O 3 ] (x = 0.3, 0.5, 0.6, 0.8 and 1.0), were recorded over a continous spectral range from 450 -4000 cm -1 .IR spectra were analyzed to determine and differentiate the various vibrational modes in the structural changes.Raman spectroscopy of all glass samples were also carried out wavenumber range form 200 -1500 cm -1 .These two complementary spectroscopic techniques revealed that the network structure of the studied glasses is mainly based on BO 3 , pentaborate groups linked to BO 4 tetrahedra and units placed in different structural groups, the BO 3 units are dominanting.The recorded IR and Raman spectra of different glasses are used to clarify the optical properties of the prepared glass samples correlating with their structure and compositions.UV-Vis spectroscopy was carried out in range of 200 -800 nm.The optical band gap was found between 2.023 -3.320 eV.