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Polymerized Complex Route to Synthesis of Pure Y 2 Ti 2 O 7 at 750°C Using Yttrium‐Titanium Mixed‐Metal Citric Acid Complex
Author(s) -
Kakihana Masato,
Milanova Maria M.,
Arima Momoko,
Okubo Toru,
Yashima Masatomo,
Yoshimura Masahiro
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08781.x
Subject(s) - pyrochlore , yttrium , citric acid , titanium , materials science , ethylene glycol , precipitation , metal , inorganic chemistry , chelation , nuclear chemistry , chemistry , metallurgy , oxide , organic chemistry , phase (matter) , physics , meteorology
A polymerized complex technique was used to prepare high‐purity pyrochlore Y 2 Ti 2 O 7 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 Y 2 Ti 2 O 7 . Based on the results of 13 C‐NMR spectroscopy, it was suggested that a mixed‐metal (Y,Ti)‐CA 3 chelate complex formed in a starting CA/EG solution. The formation of pure pyrochlore Y 2 Ti 2 O 7 occurred when the precursor was heat‐treated in a furnace set at 750°C in static air for 4 h.