Crystallization Kinematics and Dielectric Behavior of (Ba,Sr)TiO3 Borosilicate Glass Ceramics

Avadhesh Kumar Yadav, Chandkiram Gautam, Prabhakar Singh

Department of Applied Physics, Institute of Technology, Banaras Hindu University, Varanasi, India.
Department of Physics, University of Lucknow, Lucknow, India.

DOI: 10.4236/njgc.2012.23018                

Abstract

Perovskite [(Ba_0.6Sr_0.4)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.

Keywords

BST Glass Ceramics; DTA; Crystallization; XRD; SEM; Dielectric Constant

Conflicts of Interest

The authors declare no conflicts of interest.

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