Polymerized Complex Route to Synthesis of Pure Y2Ti2O7 at 750°C Using Yttrium-Titanium Mixed-Metal Citric Acid Complex |
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| Authors: | Masato Kakihana Maria M Milanova † Momoko Arima Toru Okubo Masatomo Yashima Masahiro Yoshimura |
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| Affiliation: | Research Laboratory of Engineering Materials, Tokyo Institute of Technology, Yokohama 266, Japan |
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| Abstract: | A polymerized complex technique was used to prepare high-purity pyrochlore Y2Ti2O7 powders at 750°C. Heating of a mixed solution of citric acid (CA), ethylene glycol (EG), and yttrium and titanium ions, with a molar ratio of CA:EG:Y:Ti = 5:20:1:1, at 130°C produced a yellowish transparent polymeric gel without any precipitation; this material was used subsequently as a precursor for Y2Ti2O7. Based on the results of 13C-NMR spectroscopy, it was suggested that a mixed-metal (Y,Ti)-CA3 chelate complex formed in a starting CA/EG solution. The formation of pure pyrochlore Y2Ti2O7 occurred when the precursor was heat-treated in a furnace set at 750°C in static air for 4 h. |
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