Effect of Al₂O₃ addition on the formation of perovskite-type NaNbO₃ nanocrystals in silicate-based glasses

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• 作者：Keitaro Kioka^a ; Tsuyoshi Honma^a ; Keiichiro Oh-ishi^a ; Sindy Reibstein^b ; Ning Da^b ; Lothar Wondraczek^b ; Takayuki Komatsu^a ; ^{komatsu@mst.nagaokaut.ac.jp}
• 关键词：NaNbO3 ; Nanocrystals ; Aluminosilicate glass ; Transmission electron microscopy ; Laser patterning
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2012
• 出版时间：1 July, 2012
• 年：2012
• 卷：358
• 期：12-13
• 页码：1523-1529
• 全文大小：1914 K

文摘

The crystallization behavior of 30Na₂O-25Nb₂O₅-(45 ?#xA0;x) SiO₂-xAlO_1.5 (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 ¡ãC for 5 h) glass with x = 5, which contains NaNbO₃ nanocrystals with an average size of 50 nm, shows good optical transparency in the wavelength region of 500-2000 nm 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: 1.3-1.4 W, scanning speed: 10 ¦Ìm/s) of Yb:YVO₄ fiber laser (wavelength: 1080 nm). The formation mechanism of NaNbO₃ nanocrystals in aluminosilicate glasses was also discussed.