A simple solution route to the synthesis of pure La2Ti2O7 and Nd2Ti2O7 at 700-800°C by polymerized complex method

Maria M. Milanova, Masato Kakihana, Momoko Arima, Masatomo Yashima, Masahiro Yoshimura

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A polymerized complex technique was utilized to prepare high-purity La2Ti2O7 and Nd2Ti2O7. Heating of mixed solutions of citric acid (CA), ethylene glycol (EG), La (or Nd) and Ti ions with a molar ratio of CA:EG:La(or Nd):Ti = 5:20:1:1 at 130°C produced a yellowish transparent polymeric gel without any precipitation, which was subsequently used as a precursor for the production of La2Ti2O7 and Nd2Ti2O7. We suggest, based on the results of 13C NMR spectroscopy, that mixed-metal chelate complexes, (La,Ti)-CAn or (Nd,Ti)-CAn, formed in starting CA-EG solutions. The formation of pure La2Ti2O7 and Nd2Ti2O7 occurred when the precursor was heat treated in a furnace set at 700°C and 800°C respectively in static air for 4 h.

Original languageEnglish
Pages (from-to)6-10
Number of pages5
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 1996 Sep 15
Externally publishedYes


  • C NMR spectroscopy
  • LnTiO
  • Mixed-metal chelate

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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