Interfacial Reaction of BaTiO3 Ceramics with PbO–B2O3 Glasses
Abstract:Interfacial reactions of pure, lead-, and zirconium-substituted BaTiO3 ceramics with PbOB2O3 glasses were studied, with an emphasis on the effect of glass composition. Microstructures were analyzed by scanning electron microscopy and electron-probe microanalysis aided with X-ray diffractometry of powder mixtures in the system BaTiO3PbOB2O3 heated at 850°C. The interfacial microstructures were divided into two types, depending on the glass composition. The first type was characterized by precipitates of TiO2 dispersed in the glass matrix. Extended heating or limited glass volume resulted in the formation of a continuous layer of BaTi(BO3)2. The second type of microstructure was characterized by a lead-rich perovskite phase, which developed at the glass/ceramic interfacial region. Growth kinetics for this phase denied the diffusion-controlled mechanism. The substitution of lead in BaTiO3 enhanced the penetration of glass into the ceramics along the grain boundaries and developed a coreshell structure.
Document Type: Research Article
Affiliations: Faculty of Science and Technology, Keio University, Yokohama 223, Japan
Publication date: January 1, 1997