Infrared analysis of the grossular-hydrogrossular series.

Abstract

The IR absorption spectra of the grossular-hydrogrossular series have been recorded for hydrothermally synthesized materials. The compositions of the prepared materials are Ca3Al2(SiO4)3-x(O4H4)x (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0). IR absorption patterns of these garnets were given by the KBr method in the range of wave number from 4000 to 250 cm-1 after drying in a vacuum desiccator with Mg(ClO4)2. The results showed a close relation between the spectrum patterns and the amounts of constitutional water in these garnets. The linear relation between the chemical composition and the ratio of logarithmic transmittancy was observed for 14 pairs of absorption bands and/or transmission ones. This implies the possible use of the IR absorption method in the determination of the amount of water in garnets of this series.-T.Y.