The absorption band at 464–492 cm 1 is due to O–Si–O bonds bending vibration, the bands typical of carbonate phases are seen: at 876, 1423, 1485, 1426 and 1424 cm 1 .
The absorption band at 464–492 cm 1 is due to O–Si–O bonds bending vibration, the bands typical of carbonate phases are seen: at 876, 1423, 1485, 1426 and 1424 cm 1.