Abstract
Ferroelectric glass-ceramics of the Na2O–BaO–Nb2O5–SiO2 system were obtained from a controlled crystallization process performed on the parent glass of composition 20Na2O–10BaO–30Nb2O5–40SiO2. Nd2O3 doping content was varied in the range 0, 0.1 and 0.5mol%. Thermal properties of the as-quenched sample were studied by DTA technique and the results of DTA showed a possible crystallization peak at 740°C and this was selected as the treatment temperature. The obtained glass-ceramics were investigated in terms of crystalline phase formation by XRD technique, microstructure by SEM and optical property using UV–visible spectroscopy. Fluorescence spectra of the glass-ceramics were also recorded at RT. The results of XRD revealed that NaNbO3 and Ba2NaNb5O15 were the dominant crystalline phases. The microstructures of the glass-ceramics reveal randomly distributions of small crystallites with the size in the range 0.17–0.19µm. At low Nd3+ content, the glass-ceramics were transparent material. With a yellow light excitation at 580nm, the glass-ceramic shows possible emissions in the ultraviolet, blue and green light region.
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