FT-IR SPECTROSCOPIC STUDY OF PREPARATION OF LEAD ZIRCONIUM TITANATE (PZT) BY SOL-GEL PROCESSING

Gelation time, gel structure and volatility of by-products during gela tion of PZT sol-gel processing were investigated by FT-IR spectroscopy . FT-m spectroscopic study was performed on PZT gels with the various H2O contents (1, 2 and 3 mol) and the several types (HNO3, NH4OH) and amounts (0.1, 0.2 mol) of catalysts, monitoring temporal (0, 1, 3, 10 weeks, 3 months and 3 years) and thermal (100-700 degrees C) changes o f FT-IR spectra. The interpretation of temporal change of the spectra revealed two trends. One is under the condition of 1 mol H2O, 1 mol H2 O+0.1 mol HNO3, 3 mol H2O and the other is for 1 mol H2O+0.1 mol NH4OH , 2 mol H2O, 1 mol H2O+0.2 mol HNO3. The gel structures and the gelati on times for these conditions were discussed in comparison with the re ported results of SiO2, and we suggested the reaction mechanisms for t hese structural characteristics. Thermal variation of FT-IR spectra wa s interpreted as the evolution processes of gel by investigating the e vaporation of solvent and the decomposition of organic residues.