Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Crystallization and Analysis of Perovskite Crystals in Ferroelectric-based Glasses

Pat Sooksaen, Jiraporn Hongart, Tippawan Arsawuth,and Utumporn Meesukon
* Author for corresponding; e-mail address: pat@su.ac.th
Volume: Vol.35 No.3 (SEPTEMBER 2008)
Research Article
DOI:
Received: 17 May 2008, Revised: -, Accepted: 30 August 2008, Published: -

Citation: Sooksaen P., Hongart J., Arsawuth T. and Meesukon A.U., Crystallization and Analysis of Perovskite Crystals in Ferroelectric-based Glasses, Chiang Mai Journal of Science, 2008; 35(3): 427-436.

Abstract

The effects of heat treatment on properties of ferroelectric materials prepared by glass-ceramic route based on two glass compositions with different ratios of  glass forming oxides were studied. The compositions were Glass I: 20PbO – 20BaO – 25TiO2  – 5Al2O3 – 15SiO2 – 15B2O3 (mol%) and Glass II: 20PbO – 20BaO – 25TiO2 – 5Al2O3 – 5SiO2– 25B2O3 (mol%). Both glasses were heat treated at 600, 700 and 800 oC for 8 h to form glass-ceramics. XRD found PbTiO3 as the primary phase but not BaTiO3 Ferroelectric PbTiO3 . had tetragonal perovskite structure. Increasing heat treatment temperature resulted in an increase of PbTiO3  crystal size with an increase of c/a ratio (>1) which indicates the increase in tetragonality of PbTiO3 phase. XRD also found crystallization of secondary phase(s) in each heat treated glass and analysis by SEM revealed that the phase composition and morphology were different for different glass compositions. The apparent densities of  these glass-ceramics were found to increase with increasing heat treatment temperature due to increase amount of  crystalline phases. The room temperature dielectric constants of  as-annealed glasses were about 20 and increased to values of  30 – 65 for crystallized samples.

Keywords: glass-ceramics, crystallization, x-ray diffraction, electron microscopy

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