
FTIR and Raman spectroscopic analysis indicated that increasing doping of CrO3 changes the structural network by increasing the number of nonbridging oxygens (NBO) within the glassy matrix. DTA of the glasses revealed a shift in baseline which suggests a change in specific heat and attributed to the glass transition temperature, Tg. The density of glass and glass-ceramics decreased from 3.4553 to 3.4381 g/cm3 and 3.7485 to 3.1977 g/cm3 with an increasing concentration of CrO3. XRD patterns of glass and glass-ceramics showed amorphous and crystalline nature. Various glass compositions were prepared in a glassy system (x = 0, 2, 4, and 6) using melt-quenching technique. The optical band gap was found between 2.023 -3.320 eV. UV-Vis spectroscopy was carried out in range of 200 -800 nm. 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. 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. Raman spectroscopy of all glass samples were also carried out wavenumber range form 200 -1500 cm −1. IR spectra were analyzed to determine and differentiate the various vibrational modes in the structural changes. Infrared absorption spectra, for various (Ba,Sr)TiO 3 borosilicate glass samples having glass system 64-35-5-1 (x = 0.3, 0.5, 0.6, 0.8 and 1.0), were recorded over a continous spectral range from 450 -4000 cm −1. Glasses were synthesized by conventional rapid melt quench method. In this research paper we are reporting synthesis, structural and optical investigations of barium strontium titanate boro-silicate glasses with addition of La 2 O 3. Keywords: (Ba,Sr)TiO3 Infrared Spectroscopy UV-Vis Spectroscopy Raman Spectroscopy The optical band gap was found between 2.023 - 3.320 eV. UV-Vis spectroscopy was carried out in range of 200 - 800 nm. These two complementary spectroscopic techniques revealed that the network structure of the studied glasses is mainly based on BO3, pentaborate groups linked to BO4 tetrahedra and units placed in different structural groups, the BO3 units are dominanting. Raman spectroscopy of all glass samples were also carried out wavenumber range form 200 - 1500 cm−1. Infrared absorption spectra, for various (Ba,Sr)TiO3 borosilicate glass samples having glass system 64- 35-5-1 (x = 0.3, 0.5, 0.6, 0.8 and 1.0), were recorded over a continous spectral range from 450 - 4000 cm−1.

In this research paper we are reporting synthesis, structural and optical investigations of barium strontium titanate boro- silicate glasses with addition of La2O3.

The addition of 1 mol% of La 2 O 3 to the lead bismuth titanate glasses enhances the crystallization and acts as donor dopant for this glass system. The values of dielectric constant as well as dielectric loss were increased with increasing the temperature within the frequency range from 20 Hz to 100 Hz. The scanning electron microscopy (SEM) of these glass ceramic samples has been carried out to explore the morphology through nucleation and growth of the crystallites in the glassy matrix. These samples are carried out for XRD measurements in the 2í µí¼ range from 20 to 80 ∘ to study the crystallization behaviour and phase formation of the glass ceramic samples. The prepared glasses were crystallized by regulated controlled heat treatment process on the basis of their DTA results. DTA measurements were recorded in temperature range from 30 to 1200 ∘ C. Differential thermal analysis (DTA) has been employed to determine the glass transition temperature, í µí± í µí±, as well as crystallization temperature, í µí± í µí±. The amorphous nature of glass samples in this glass system is confirmed by using X-ray diffraction (XRD) study. Lead bismuth titanate borosilicate glasses were prepared in the glass system 65-34-1La 2 O 3 (0.0 ≤ í µí±¥ ≤ 1.0) doped with one mole percent of La 2 O 3 via conventional melt quench method.
