Abstract
Perovskite [(Ba0.6Sr0.4)TiO3]-[2SiO2-B2O3]-[K2O]-La2O3 glass was prepared by conventional melt quench method. The differential thermal analysis (DTA) was performed on glass sample in the temperature range from 100℃ to 1000℃ by different heating rate to study the crystallization kinematics. The kinetic parameters characterizing the crystallization have been determined using an Arrhenius model. Glass samples were subjected to appropriate heat treatment schedules for their suitable crystallization. X-ray diffraction analysis (XRD) of glass and glass ceramic samples were done to check the amorphous state and crystalline nature. XRD of glass ceramic sample shows the major perovskite phase of BaTiO3 (BT) along with the formation of secondary phases Ba2TiSi2O8 (BTS) and Ba2Ti2B2O9 (BTB). Scanning electron microscopy (SEM) is also studied to see the morphology of the grains of major and secondary phase formation in BST glass ceramic samples. La2O3 is played an important role to increase the nucleation of the crystallites in the glassy matrix. The addition of La22O3 results in development of well interconnected crystallites formed as major phase of BST. In this paper, we are reporting the crystallization behavior of BST borosilicate glass system and high temperature dielectric characteristics of their glass ceramics.
Highlights
Glass ceramics are polycrystalline materials produced by high-temperature, controlled nucleation and crystallization of glasses
Their study showed that crystallization processes occur by nucleation and growth and it depends on the temperature and the substance, either step may determine the rate of spontaneous crystallization
There are some factors that influence the properties of the major crystalline phase in a glass ceramic are the surrounding glass matrix, their crystallization kinetics and nucleation mechanism, particle size and presence of other crystalline phases
Summary
Glass ceramics are polycrystalline materials produced by high-temperature, controlled nucleation and crystallization of glasses. Doping of La2O3 in [SrO·TiO2]-[SiO2·B2O3] influences the crystallization of the glass as well as dielectric properties of the glass ceramic samples in the present system. The study of glass ceramics system [(PbxSr1–x)O·TiO2]-[2SiO2-B2O3]-[K2O]-[BaO]-[La2O3], shows dispersion of semiconducting perovskite phase in insulating glassy matrix and may lead to space charge polarization around crystal glass interface, imparting high value of effective dielectric constant. These glass ceramics may be used for capacitor applications [17]. The doping of La2O3 in the (PbSr)TiO3 borosilicate glass ceramic system enhances the crystallization and retards the minor phase [18,19]
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