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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 ℃ with a heating rate of 10 ℃/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.


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

Show Author's information Chandkiram R. GAUTAMa( )Abhishek MADHESHIYAaRanabrata MAZUMDERb
Advanced Glass and Glass Ceramic Research Laboratory, Department of Physics, University of Lucknow, Lucknow 226007, India
Department of Ceramic Engineering, National Institute of Technology, Rouerkela 769008, India

Abstract

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 ℃ with a heating rate of 10 ℃/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.

Keywords:

lead bismuth titanate, differential thermal analysis (DTA), crystallization, scanning electron microscopy (SEM), dielectric behavior
Received: 10 April 2014 Revised: 15 May 2014 Accepted: 28 May 2014 Published: 02 September 2014 Issue date: September 2014
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Publication history

Received: 10 April 2014
Revised: 15 May 2014
Accepted: 28 May 2014
Published: 02 September 2014
Issue date: September 2014

Copyright

© The author(s) 2014

Acknowledgements

The authors are gratefully acknowledged to the Uttar Pradesh Council of Science and Technology, Lucknow (India) for financial support under the “Young Scientist Scheme” as major research project No. CSTT/YSS/D- 3913. Authors are also thankful to Dr. Atul Khanna, associate professor, for his constant support and to extending the XRD measurement facility at Department of Physics, Guru Nanak Dev University, Amritsar 143005, India.

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