article posted 2 Apr 2016
Dr. Atsunobu Masuno was born July 17, 1975 in Osaka, Japan. He received the
Bachelor of Science in Chemistry in 1999, the Master of Science in Chemistry in 2001, and the Doctor of Science in Chemistry in 2004 from Kyoto University. He was a postdoc researcher in 2004?2005 in Kyoto University and a researcher in Japan Aerospace Exploration Agency in 2006. He was a research associate at the University of Tokyo from 2007 until 2016 and is at present an associate professor at Hirosaki University.
Functional oxide glasses prepared by a levitation technique
Containerless processing, which enables a melt to be levitated in air, prevents the melt
from crystallization at the boundary between the melt and a container wall.
Accordingly, deeper undercooling can be realized and materials with a low
glass forming ability are often vitrified. Some binary systems, such as
- based, Nb2
have been vitrified in
bulk form without using any network-former oxides by containerless processing.
Among them, TiO2
-based glasses have attracted much attention
since the refractive index n is quite high (n ≈ 2.3) and the wavelength dispersion is
rather low in visible range. The high refractive index n > 2.0 with low wavelength
dispersion glass is a key optical component such as thinner lens for digital camera
of smart phones, and solid immersion lens for next-generation optical disk system.
Furthermore, 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 TiO2
-based 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.
Recently, new glass systems with strong mechanical properties have been obtained.
glasses have a very high elastic modulus and
shows crack-resistant behaviors.