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.
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