Polymerized Complex Synthesis of Perovskite Lead Titanate at Reduced Temperatures: Possible Formation of Heterometallic (Pb,Ti)-Citric Acid Complex

Masato Kakihana, Toru Okubo, Momoko Arima, Osamu Uchiyama, Masatomo Yashima, Masahiro Yoshimura, Yoshiyuki Nakamura

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Abstract

Perovskite PbTiO3 powders were prepared by a polymerized complex technique at relatively low temperatures, viz. 400-600°C. Heating of a mixed solution of citric acid (CA), ethylene glycol (EG), and Pb and Ti ions with a molar ratio of Pb/Ti/CA/EG = 1/1/10/40 at 130°C produced a yellowish transparent polymeric gel without any precipitation, which after pyrolysis at 300°C was converted to a powder precursor for PbTiO3. We suggest, based on the results of Raman and 13C NMR spectroscopies, that a heterometallic (Pb,Ti)-CA3 chelate complex formed in a starting Pb/Ti/CA/EG solution and it was thermally stable upon polymerization at 130°C. Chemical analyses showed no PbO loss during calcination of powder precursors at 400-700°C, which led to the conclusion that a solid-state reaction between isolated PbO and TiO2 particles was not responsible for PbTiO3 formation, but PbTiO3 formed directly by thermal decomposition of the powder precursor above 400°C.

Original languageEnglish
Pages (from-to)451-456
Number of pages6
JournalChemistry of Materials
Volume9
Issue number2
DOIs
Publication statusPublished - 1997 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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