학술논문
Low temperature hydrothermal synthesis of lead titanate crystallites
Document Type
Conference
Author
Source
ISAF '96. Proceedings of the Tenth IEEE International Symposium on Applications of Ferroelectrics Ferroelectrics applications Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on. 2:723-726 vol.2 1996
Subject
Language
Abstract
A study was conducted to compare the minimum reaction temperatures for the hydrothermal synthesis of pure lead titanate crystallites with precursors I and II. The synthesis conditions (i.e., temperature, pH, and input reagent concentrations) were calculated using a thermodynamic model. A comparison between the theoretically modeled and experimental conditions was made. Although the models predicted reactions as low as 25/spl deg/C, the minimum temperatures for a 72 h reaction time with precursors I and II were 120 and 140/spl deg/C, respectively. Furthermore, by increasing the Pb/Ti molar stoichiometric ratio from 1.0 to 2.0 (with precursor LT) the reaction temperature for phase-pure lead titanate could further be reduced below 90/spl deg/C; while with precursor I phase-pure lead titanate was difficult to obtain and was not obtained below 140/spl deg/C. It can be concluded that precursor composition and stoichiometry influence the reaction temperature.