Abhishek Madheshiya

Synthesis and Structural Properties of Lead Strontium Titanate Borosilicate Glasses with Addition of Chromium Trioxide and Graphene Nanoplatlets

Various lead strontium titanate borosilicate glass samples were prepared with addition of 1 mol % of chromium trioxide and graphene nanoplatelets by convention melt quench method. Their structural and optical behaviors were studied by infrared spectroscopy, ultraviolet–visible spectroscopy, and scanning electron microscopy. The infrared spectroscopic studies were carried in the wavenumber range of 400–4000 cm−1. The energy band gap of bulk transparent glass samples were found by Tauc plots of ultraviolet–visible spectra. Surface morphological studied was done by scanning electron microscopy. The density of these prepared lead strontium titanate borosilicate glass samples were calculated by “Archimedes principle” of liquid displacement method.

Synthesis, Crystallization, and Dielectric Behaviour of Lead Bismuth Titanate Borosilicate Glasses with Addition of 1% La2O3

Lead bismuth titanate borosilicate glasses were prepared in the glass system 65[()·TiO3]-34[2SiO2·B2O3]-1La2O3 () doped with one mole percent of via conventional melt quench method. The amorphous nature of glass samples in this glass system is confirmed by using X-ray diffraction (XRD) study. Differential thermal analysis (DTA) has been employed to determine the glass transition temperature, , as well as crystallization temperature, . DTA measurements were recorded in temperature range from 30 to 1200°C. The prepared glasses were crystallized by regulated controlled heat treatment process on the basis of their DTA results. These samples are carried out for XRD measurements in the 2 range from 20 to 80° to study the crystallization behaviour and phase formation of the glass ceramic samples. 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. 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 addition of 1 mol% of to the lead bismuth titanate glasses enhances the crystallization and acts as donor dopant for this glass system.

Preparation, crystallization, microstructure and dielectric properties of lead bismuth titanate borosilicate glass ceramics

Various bulk and transparent glasses were prepared by rapid melt quenching technique in the glass system 55[(PbxBi1−x)TiO3]-44[2SiO2B2O3]-La2O3 (x = 0–0.7). The X-ray diffraction (XRD) studies of the glass samples confirmed the amorphous nature. The differential thermal analyses (DTA) were carried out from room temperature to 900 °C with a heating rate of 10 °C/min. The DTA patterns of the samples showed one or more exothermic sharp peaks shifting towards lower temperature side with increasing concentration of bismuth oxide (BiO). On the basis of DTA results, the solid solution of bismuth titanum oxide (Bi2Ti2O7)/lead bismuth titanium oxide (Pb3Bi4Ti6O21) was precipitated in borosilicate glassy matrix as a major phase. The glasses were subjected to 4 h and 8 h heat treatment schedules to convert into glass ceramics. XRD analysis of these glass ceramic samples showed that the major crystalline phase of the entire glass ceramic samples with 0 ≤ x ≤ 0.5 is found to have cubic crystal structure, while it is tetragonal for glass ceramic sample with x = 0.7. The scanning electron microscopy (SEM) micrographs indicated the uniform distribution of Bi2Ti2O7 and Pb3Bi4Ti6O21 crystallites in the glassy matrix.

Synthesis, structural and X-ray absorption spectroscopy of (PbxBi1-x).TiO3 borosilicate glass and glass ceramics

Abstract Two series of glasses were synthesized by conventional rapid melt-quench method for different glass systems 55[(PbxBi1-x).TiO3]-44[2SiO2B2O3] and 65[(PbxBi1-x).TiO3]-34[2SiO2B2O3] doped with 1 mole percent of La2O3. X-ray diffraction study of synthesized glass sample shows amorphous nature while the glass ceramic sample revealed a cubic crystal structure due to devitrification of the glass as major crystalline phase of bismuth titanium oxide. X-ray absorption spectroscopy measurements in transmission mode were carried out and confirm the maximum value of absorption coefficient, 3.05 at energy 13450 eV for lead free glass ceramic sample. Scanning electron microscopy and contact angle measurements were also performed to explain the surface morphology. Energy dispersive X-ray analysis confirmed the presence of grains of bismuth titanium oxide and its elemental analysis with O, Ti, Si, Bi nanoparticles. The inclusions of La2O3 results in development of well interconnected crystallites were formed as major phase of bismuth titanium oxide.

Preparation and Optical Investigations of [()TiO3]-[2SiO2B2O3]-[CeO2] Glasses

We are reporting synthesis and structural and optical investigation of strontium bismuth titanate borosilicate glasses with addition of one mole percent cerium oxide (CeO2). Glasses were synthesized by conventional rapid melt quench method. XRD studies of the glass samples confirm the amorphous nature. Infrared absorption spectra various strontium bismuth titanate borosilicate glass samples having glass system 60[()TiO3]-39[2SiO2B2O3]-1[CeO2] () were recorded over a continuous spectral range from 400 to 4000 cm−1. IR spectra were analyzed to determine and differentiate of various vibrational modes in the structural change. Raman spectroscopy of all glass samples was also carried out in the wave number range from 200 to 2000 cm−1.