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

2016

Bull Mater Sci

The effects on the optical and physical properties of these glasses due to the addition of La 2 O 3 as well as variation of the various oxides have been investigated. X-ray diffraction analysis is used to confirm the amorphous nature of the prepared glasses. Structures of glasses were studied by using UV-Vis and Fourier transforms infrared spectroscopy. The drilling test was also performed on their glass ceramic samples to confirm the machinability.

“…Therefore, the density of the prepared glass samples has been calculated by using Archimedes Principle [17]. Distilled water was used as the liquid medium.…”

Section: Density Measurementsmentioning

confidence: 99%

Synthesis and optical properties of SiO2–Al2O3–MgO–K2CO3–CaO–MgF2–La2O3 glasses

2016

Bull Mater Sci

“…Eventually, the annealed glass samples were devitrified into glass ceramics by given desired heat treatment schedule according to the results of differential thermal analysis (DTA/TGA). The DTA results were already reported somewhere [28].…”

Section: Preparation Of Glass Samplesmentioning

confidence: 75%

“…The crystallite size of glass ceramic sample BTL0.0626E was found to be ∼38 nm. The crystallite size of the rest glass ceramic samples, PBTL0.1631E, PBTL0.3624E and PBTL0.5622E were already reported and their values were found to be 60.93 nm, 27.67 nm and 66.09 nm, respectively [28].…”

Section: Nomenclatures Of Glass and Glass Ceramic Samplesmentioning

confidence: 86%

Synthesis, structural and X-ray absorption spectroscopy of (Pb_xBi_1-x).TiO₃borosilicate glass and glass ceramics

Madheshiya

Journal of Asian Ceramic Societies

Kumar

2017

Self Cite

a b s t r a c tTwo series of glasses were synthesized by conventional rapid melt-quench method for different glass systems 55 ).TiO 3 ]-44[2SiO 2 B 2 O 3 ] and 65[(Pb x Bi 1-x ).TiO 3 ]-34[2SiO 2 B 2 O 3 ] doped with 1 mole percent of La 2 O 3 . 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 La 2 O 3 results in development of well interconnected crystallites were formed as major phase of bismuth titanium oxide.

“…The conductivity difference is responsible for space charge polarization and hence the effective value of dielectric constant [44]. The order of the dielectric constant, , was higher than that reported earlier for La 2 O 3 doped PBT glass ceramics [45]. Figure 7 shows the plots of dielectric constant and dissipation factor versus temperature for the glass ceramic sample PBTL0.4875T; both plots have similar trends.…”

Section: Dielectric Characteristicsmentioning

confidence: 76%

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

Indian Journal of Materials Science

Madheshiya

Dwivedi

2015

Self Cite

Lead bismuth titanate borosilicate glasses were prepared in the glass system 65[(Pb Bi 1− )⋅TiO 3 ]-34[2SiO 2 ⋅B 2 O 3 ]-1La 2 O 3 (0.0 ≤ ≤ 1.0) doped with one mole percent of La 2 O 3 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 La 2 O 3 to the lead bismuth titanate glasses enhances the crystallization and acts as donor dopant for this glass system.