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Abstract
Ferroelectric glasses and glass-ceramics were prepared from selected composition in the Na 2 O-Nb 2 O 5 -Al 2 O 3 -SiO 2 glass system. Small amount of TiO 2 was also added. Conventional melt-quenching technique was employed for a glass production and the selected bulk parent glass samples were subjected to the heat-treatment process. Clear transparent glass was obtained but with surprise presence of precipitated nano-size NaNO 3 crystals as the result of phase separation. For the heat-treated samples, the longer treatment time induced a higher volume fraction of the NaNbO 3 crystals, but thier size was not significantly increased. Dielectric response of the glass-ceramics contained NaNbO 3 crystals is the combination of all contribution from both crystalline phases and the glass matrix.
Acknowledgment
The authors would like to thank the Research Division and the Faculty of Science of the Ubon Ratchathani University for financial support.