首页|CRYSTALLIZATION BEHAVIOR OF FERROELECTRIC GLASS-CERAMICS OF THE Na_2O-Nb_2O_5-Al_2O_3-SiO_2 SYSTEM CONTAINED TiO_2
CRYSTALLIZATION BEHAVIOR OF FERROELECTRIC GLASS-CERAMICS OF THE Na_2O-Nb_2O_5-Al_2O_3-SiO_2 SYSTEM CONTAINED TiO_2
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The ferroelectric glass-ceramic of the composition Na_2O-Nb_2O_5-Al_2O_3-SiO_2 was prepared by controlling crystallization of the glass that added with small amount of TiO_2. The effect of TiO_2 content on crystallization behavior and the dielectric property were determined. X-ray diffraction studied indicated that NaNbO_3, NaNbO_8 and a compound of alkali alumino silicate composition were readily formed in the as-quenched glass as the product of phase separation. After treatment at 700℃ for various times, NaNbO_3 volume fraction was found to increase with time. Crystalline size of the NaNbO_3 was lower than 300 nm and it was developed with treatment time. Presence of TiO_2 had considerably effect on NaNbO_3 volume fraction when treatment time shorter than 1.0 h. The dielectric response of the glass-ceramic samples was found to arise from all contributions of crystalline phases and glass matrix responds.
crystallizationsodium niohateheat treatment and ferroeleclric glass-ceramics
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