Synthesis, IR and Raman Spectroscopic Studies of (Ba,Sr)TiO<sub>3</sub> Borosilicate Glasses with Addition of La<sub>2</sub>O<sub>3</sub>

Abstract

A series of glasses were prepared by rapid melt quench method in the glass system (65 − x)[(Ba 0.6 Sr 0.4)TiO 3 ]-30[2SiO 2-B 2 O 3 ]-5[K 2 O]-x[La 2 O 3 ] (x = 0, 1, 2, 5 and 10). X-ray diffraction of glass samples were carried to check its amorphousity. Density of glass samples were measured using Archimedes principle. The refractive index of these glass samples lies between 2.39 to 2.80. Optical properties of these glass samples were studied using Infrared (IR) and Raman spectroscopic techniques. IR measurements were done over a continous spectral range 450-4000 cm-1 to study their stucture networking systematically while Raman spectra were recorded over a continous spectral range 200-2000 cm-1. IR spectra of all glass samples showed number of absorption peaks. These absorption peaks occurs due to asymetric vibrational streching of borate by relaxation of the bond B-O of trigonal BO 3. The Raman spectra of all glass samples exhibited different spectral bands and intensity of these bands changes drastically. The network structure of these glass samples is mainly based on BO 3 and BO 4 units placed in different structural groups.

Mechanical and dielectric behaviors of perovskite (Ba,Sr)TiO3 borosilicate glass ceramics

“…The density of green pellets of samples BT5K1L0.0 is found to be 3.07 g/cm 3 , and that of sintered pellets of sample BT5K1L0.0T850 is 3.36 g/cm 3 while for BT5K1L0.0S850 is 3.38 g/cm 3 . The density of sintered glass ceramic samples is found to be higher than the reported value of density of glass ceramic samples formed by controlled crystallization of glass for the same system [24]. This shows that densification of glass ceramic samples on sintering increases with increasing the sintering time.…”

Synthesis of Eu3+‐doped BaBi2Ta2O9 based glass‐ceramic nanocomposites: Optical and dielectric properties

“…The reflectance band centerd around 627 cm −1 is assigned to the Ta–O bond stretching in TaO 6 octahedra . As shown in the Figure , with progression of heat‐treatment time the intensity of reflection around 627 cm −1 increases, whereas a sharp band at 476 cm −1 appeared for the 30 hours heat‐treated sample, which corresponds to Ba 2+ ion vibration . Thus from the analysis of the FTIR reflectance spectra of BBTE glass‐ceramics, it is evident that evolution of BaBi 2 Ta 2 O 9 crystalline phase is increased with increase in ceramization time.…”

Sol–gel synthesis and luminescence characteristics of Sr(3−(2x+y))MgSi2O8: (Ce3+,Li+)x, Euy2+ phosphor for solid state lighting

“…The sample heated at 900°C, has multiple absorption bands at 1000-800 cm -1 and 600-500 cm -1 , which can be attributed to the stretching and bending vibrations of Si-O bonds in SiO 4 tetrahedra, respectively [26]. The absorption in the region 470-523 cm À1 is identified as vibration of metal cation such as Mg 2+ , Sr 2+ , Ba 2+ [27]. The broad band in the region 1250-1750 cm À1 is due to the presence of urea and acetate group [28].…”