KJ Ceramics 31

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Detailed Program

Paper Number : GL-I02

Time Frame : 13:30~13:55

Presentation Date : Thurse day, 27, November

Session Name : Glass& Opto-Electronic Meterials

Session Chair 1# : Woonjin Chung

Session Chair 2# : Hirokazu Masai

Functional oxide glasses prepared by a levitation technique

Atsunobu MASUNO

The University of Tokyo

Containerless processing is one of the advanced vitrification techniques. A levitated melt is rapidly cooled to obtain spherical bulk glass. Bulk glass formation is due to the absence of both the inhomogeneous nucleation from the container wall and the deeper undercooling in a melt. Recently, we have succeeded in preparing bulk glasses in some binary systems, such as TiO2-based, Nb2O5-based, WO3-based, and La2O3-based glasses without using any network-former oxides by containerless processing.[1-7] These glasses have attracted much attention since they are colorless and transparent, the refractive index n is much high (n ~ 2.3), and the wavelength dispersion is rather low in visible range. These excellent optical properties have been desired for advanced optics such as thinner lens for digital camera of smart phones, and solid immersion lens for next-generation optical disk system. The structural analyses by using X-ray and neutron diffraction and reverse Monte-Calro simulation, and molecular dynamics simulation revealed that the glass structures of the high refractive index glasses were quite different from those of the conventional oxide glasses. The high oxygen packing density causing the high refractive index is realized in these new glasses. Furthermore, very recently, we have obtained new glass systems having very high cracking resistance by containerless processing. The details of the new functional oxide glasses will be presented.

Acknowledgements :

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