Abstract
High transparency in the NaNbO3 crystal–silica glass system at low silica content is attributed to maintenance of the glass‐to‐glass phase separation pattern in microstructure throughout the process of crystallization. Optical properties are explained by a characteristic of the phase‐separated glass, internal connectivity, applicable in this case to both crystal and glass phases. This type of microstructure allows light propagation in each phase independently, without interference between phases. Deviation from this ideal behavior and light‐scattering mechanisms which may apply to different phase distribution patterns here and in other glass‐ceramic systems are discussed.
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