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Influence of [Ba + Ca]/[Ti + Zr] Ratio on the Interfacial Property of (Ba,Ca)(Ti,Zr)O 3 (BCTZ) Powders in an Aqueous Medium
Author(s) -
Lee Jaeho,
Lee Sangkyu,
Hackley Vincent A.,
Paik Ungyu
Publication year - 2003
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.1151-2916.2003.tb03416.x
Subject(s) - solubility , titration , aqueous solution , dissolution , electrokinetic phenomena , isoelectric point , adsorption , inorganic chemistry , materials science , analytical chemistry (journal) , nuclear chemistry , chemistry , chromatography , nanotechnology , biochemistry , enzyme , organic chemistry
We report findings on the electrokinetic and solubility behaviors of (Ba,Ca)(Ti,Zr)O 3 (BCTZ) powders having three different [Ba + Ca]/[Ti + Zr] ratios: 0.995, 1.000, and 1.005. Electrokinetic and solubility properties of BCTZ powders in aqueous media are phenomenologically similar to BaTiO 3 . Ba and Ca ions, occupying primarily A‐sites on the perovskite lattice, dissolve during acid titration, which results in surface depletion of A‐site cations in the surface region of BCTZ particles. The electrokinetics of colloidal BCTZ powders reflects changes in the surface chemistry that occur as a result of dissolution and adsorption/reprecipitation of surface ions. An increase in [Ba + Ca]/[Ti + Zr] ratio results in an increase in the dynamic mobility at all pH values, an increase in the titration hysteresis, and an increase in the isoelectric pH. Each of these effects can be attributed to Ba and Ca in the near‐surface region of BCTZ.