BaTiO_3結晶を含有した透明なTeO_2系ガラスの作製と光学的性質

概要

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The glass-forming region in the system TeO_2-BaO-TiO_2 and the crystalline phases obtained by heat treatment of glasses were examined to fabricate transparent TeO_2-based glasses containing ferroelectric BaTiO_3 crystals. The glasses containing up to 30 mol% BaO and 20 mol%TiO_2 were obtained. The glass transition temperatures, 341゜-463℃, and crystallization temperatures, 463゜-589℃, increased with increasing BaO and TiO_2 contents. By controlled crystallization, transparent 70TeO_2-15BaO-15TiO_2 glasses containing BaTiO_3 crystals with a diameter of about 5-10 μm were successfully prepared. The small difference in the refractive indices, n, between the TeO_2-based glass, n=2.1, as matrix and BaTiO_3 crystals, n=2.39, leads to transparency, even though the particle size is much larger than the wavelength of visible light.
社団法人日本セラミックス協会の論文
1993-01-01