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Influence of [Ba+Ca]/[Ti+Zr] Ratio on the Interfacial Property of (Ba, Ca)(Ti, Zr)O3 (BCTZ) Powders in an Aqueous Medium

Published

Author(s)

James Lee, S K. Lee, Vincent A. Hackley, U Paik

Abstract

We report on findings of the electrokinetic and solubility behavior of BCTZ powders having three different [Ba+Ca]/[Ti+Zr] ratios: 0.995, 1.000, and 1.005. Ba and Ca ions, occupying primarily A-sites on the perovskite lattice, dissolve during acid titration resulting in surface depletion of A-site cations in the surface region of BCTZ particles. The electrokinetics of colloidal BCTZ powders reflect changes in the surface chemistry that occur as a result of dissolution and adsorption/reprecipitation of surface ions. The factors affecting the electrokinetic behavior, such as [Ba+Ca]/[Ti+Zr] ratio and suspension pH, were investigated. Based on the results, a relationship between electrokinetic behavior and changes in surface chemistry as a function of the [Ba+Ca]/[Ti+Zr] ratio is proposed.
Citation
Journal of the American Ceramic Society
Volume
86
Issue
No. 6

Keywords

aqueous processing, barium titanate, BCTZ, colloids, electrokinetics, electronic ceramics, perovskite, surface chemistry, titanates

Citation

Lee, J. , Lee, S. , Hackley, V. and Paik, U. (2003), Influence of [Ba+Ca]/[Ti+Zr] Ratio on the Interfacial Property of (Ba, Ca)(Ti, Zr)O<sub>3</sub> (BCTZ) Powders in an Aqueous Medium, Journal of the American Ceramic Society (Accessed April 16, 2024)
Created June 2, 2003, Updated October 12, 2021