Abstract
The water contents of vitreous Li 2B 4O 7 (LBO) and single crystals were evaluated using near infrared (NIR) spectroscopy and moisture evaporation analysis (MEA) for studying the origin and the formation mechanism of voids in LBO crystals. The molar extinction coefficient ε at the peak of the fundamental -OH stretching vibration band at 3500 cm -1 in LBO was determined to be 60.721 mol -1 cm -1. The water content of the LBO glass varied from 703 to 55 ppm, depending on the preparation conditions. The water contents of single crystals also varied from 70 to 26 ppm with growth conditions such as growth rate, growth direction and water content of starting material. The solubility limits of water in LBO melt and crystal are about 700 and 70 ppm, because the water content of the LBO melt is thought to be similar to that of the glass which is quenched from the melt. The formation of voids are thought to be due to the large difference in the solubility of water between melt and single crystals.
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