| Optical Properties and Structure of BaO-TiO2-SiO2 Glass Ceramics |
| Tae-Ho Kim, Young-Suck Kim, Young-Joon Jeong, Young-Hoon Na, Hwan-Hong Lim1, Myoung-Sick Cha1, Bong-Ki Ryu |
School of Materials Science and Engineering, Pusan National University
1School of Physics, C01203B, Pusan National University |
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| ABSTRACT |
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Nanocrystallized glasses with the composition of $(50-x)BaO-xTiO_2-50SiO_2$ (x=10, 15, 16.7 and 20) have been prepared by heat-treatment at $T_x$ (crystallization onset temperature) for 3 h, and their optical properties, photoluminescence (PL), XRD and Raman spectra have been examined. The absorption edges of the glasses were red-shifted and the absorption coefficient increased with an increase of $TiO_2$. The glass subjected to the heat-treatment showed a dense formation of ${Ba_2}{TiSi_2}{O_8}$ crystals. The XRD and Raman results show that the nanocrystallized glasses formed fresnoite phase up to $TiO_2$ concentrations of 15 mol%. Further-more, blue luminescence with a peak at the wavelength of around 470nm was observed in the nanocrystallized glass, demon strating the optical multifunctional nanocrystallized material such as non-linear optics and photo-luminescence. It is thought that the blue luminescence from the ${Ba_2}{TiSi_2}{O_8}$ nanocrystallized glass originated from the presence of $Ti^{4+}$ incorporated into the fresnoite-type structure. |
| Key words:
Nanocrystallized glass, ${Ba_2}{TiSi_2}{O_8}$ (fresnoite), Photoluminescence |
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