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Effect of Poly(Acrylic Acid) and Poly(Vinyl Alcohol) on the Solubility of Colloidal BaTiO3 in an Aqueous Medium



S K. Lee, J. H. Lee, Vincent A. Hackley, U Paik


The influence of poly (acrylic acid) PAA) and poly(vinyl alcohol) PVA) on Ba dissolution at the BaTiO3-aqueous solution interface was investigated. Incongruent dissolution of Ba impacts the colloidal stability, microstructure and electrical properties of Ba TiO3 and related perovskite dielectric materials used in the manufactuer of ceramic capacitors. The dissolution characteristics of BaTiO3 were influenced significantly by the presence of PAA and PVA. PAA, which forms weak monodenate complexes with Ba2+, acted as both a passivating and a sequestering agent, depending on pH. Both PAA and PVA provided some degree of passivation in the acidic pH region. Above pH8, where BaTiO3 solubility decreases sharply, PVA had a moderate passivating effect, whereas solubility was enhanced by PAA with a positive linear dependence on concentration. The adsorptive and electrokinetic behavior of colloidal BaTiO3 with respect to PAA and PVA are correlated with the observed passivating and sequestering properties of these polymers.
Journal of Materials Research
No. 5


adsorption, barium titanate, colloids, dissolution, electrokinetics, passivation, poly (acrylic acid, poly(vinyl alcohol), sequestration


Lee, S. , Lee, J. , Hackley, V. and Paik, U. (2003), Effect of Poly(Acrylic Acid) and Poly(Vinyl Alcohol) on the Solubility of Colloidal BaTiO<sub>3</sub> in an Aqueous Medium, Journal of Materials Research (Accessed April 25, 2024)
Created April 30, 2003, Updated October 12, 2021