The IR absorbance spectra of investigated glazes are
illustrated in Fig. 6. All the spectra showed five characteristic
peaks located at 1634 cm, 1401 cm, 1048 cm,
781 cm and 461 cm, respectively.The absorption band
at 1634 cm was close to the position of H2O bending
vibrations.The smaller intensity bands at 1401cm and
781 cm, could be assigned to the (PO4)3 asymmetric
stretches of P–O–P bond.The absorption band at 1048 cm
was assigned to the stretching vibration of Si–O, which
indicated that the structure of the tested glazes was dominated
by the so-called Q3 group (where Q is the number of bridging
oxygen) [18,19]. The band at 461cm could be linked with
the bending vibrations of two types of bridge bonds Si–O–Si
and Si–O–Al [19].