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Effect of pH on the Chemistry of the Barium Titanium Citrate Gel and Its Thermal Decomposition Behavior
Author(s) -
Fang TsangTse,
Tsay JenqDar
Publication year - 2001
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.1151-2916.2001.tb01038.x
Subject(s) - thermal decomposition , barium , barium carbonate , chemistry , citric acid , decomposition , ethylene glycol , inorganic chemistry , titanium , metal , thermal stability , nuclear chemistry , organic chemistry , raw material
In this investigation, X‐ray diffractometry and 13 C NMR spectroscopy were used to characterize the effect of pH on the formation of gel and its thermal decomposition by the Pechini process. It was found that the major effect of pH was to destroy the esterification between citric acid (CA) and ethylene glycol, which in turn could influence Ba species and the formation of a mixed‐metal CA complex. It was also found that barium carbonate was derived from the Ba species and was not related to the instability of Ba 2 Ti 2 O 5 CO 3 , but Ba 2 Ti 2 O 5 CO 3 was formed by the thermal decomposition of a mixed‐metal CA complex. Moreover, BaTiO 3 formed via two routes, the reaction of BaCO 3 with Ti species and thermal decomposition of Ba 2 Ti 2 O 5 CO 3 .