Abstract
In a previous paper, the infrared absorption spectra of PbO-SiO2-Al2O3 and Na2O-SiO2-Al2O3 systems were reported for the purpose of finding the effect of Al2O3 on the molten silicates. In this paper, the infrared absorption spectra of calcium aluminum silicate glasses were observed for various compositions. In the CaO-SiO2-Al2O3 system, it was found that the peak of the absorption band due to stretching vibration (ν3) of Si-O tetrahedron showed a shift to about 970 cm−1 in wave number with increasing Al2O3 content in the silicate. The absorption band due to vibration of the isolated Al-O tetrahedron in glassy silicate was observed at approximately 700∼730 cm−1, and for the associated Al-O tetrahedron the peak tends to shift to the higher frequency side with increasing Al2O3 content.
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