Abstract
The crystallization behavior of 30Na2O–25Nb2O5–(45−x) SiO2–xAlO1.5 (x=0, 2.5, and 5) (mol%) glasses was examined and the effect of Al2O3 addition on the formation of perovskite-type NaNbO3 crystals was clarified. It is found from X-ray diffraction analyses and transmission electron microscope observations that NaNbO3 nanocrystals are formed in all glasses and the size of NaNbO3 crystals decreases with the substitution of Al2O3 for SiO2. A crystallized (heat-treated at 684°C for 5h) glass with x=5, which contains NaNbO3 nanocrystals with an average size of 50nm, shows good optical transparency in the wavelength region of 500–2000nm and a small hysteresis loop in the polarization–electric field curve. The lines containing NaNbO3 crystals were patterned on the surface of NiO-doped glass with x=5 by irradiations (power: 1.3–1.4W, scanning speed: 10μm/s) of Yb:YVO4 fiber laser (wavelength: 1080nm). The formation mechanism of NaNbO3 nanocrystals in aluminosilicate glasses was also discussed.
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