Abstract
Gallate glasses free of conventional glass formers were obtained in the systems (Na2O, K2O or Cs2O)-TiO2-Ga2O3 and (CaO, SrO or BaO)-TiO2-Ga2O3 by a conventional crucible-melting technique. The glass-forming region became larger with increasing radius of the alkali or alkaline earth ion in the respective groups. It was speculated from the infrared absorption spectra that the glasses are composed of a network of GaO4 tetrahedra and TiO6 octahedra, and alkali or alkaline earth ions sitting in the holes of the network. The obtained glasses showed high optical transmission in the infrared region up to 8 μm in wavelength as well as in the visible region.
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