Powder Characteristics and Sintering Behavior of SiO2 Coated BaTiO3
The Powder characteristics and sintering behavior of SiO2 coated BaTiO3 were studied. BaTiO3 powders were synthesized by the liquid mix method developed by Pechini, and silica coating was prepared by alkoxide hydrolysis method with TEOS and ethanol. The particle size of the BaTiO3 powders was ~35 nm and the thickness of the SiO2 coating layer was ~5 nm. As the SiO2 content increased, the SiO2 layers improved the powder dispersion by increasing electrostatic repulsion between the BaTiO3 particles. The Zeta potential of SiO2 coated BaTiO3 was getting close to that of pure silica with a more negative charge, compared with that of the uncoated BaTiO3. The onset temperature of shrinkage curves shifted to higher temperatures with increasing SiO2 contents.
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
J. S. Park and Y. H. Han, "Powder Characteristics and Sintering Behavior of SiO2 Coated BaTiO3", Materials Science Forum, Vols. 534-536, pp. 1065-1068, 2007