Evaluation and Statistical Analysis of Dielectric Permittivity of BaTiO3 Powders
A slurry method was used to determine the dielectric permittivity (r) of BaTiO3 powders with different characteristics, such as tetragonality (c/a ratio), density, particle size, and specific surface area. The r of powders highly depended on their characteristics. In order to extract the effect of each characteristic, a statistical analysis was carried out to represent the r of powders with an empirical formula. A fairly good agreement was obtained between observed data and those estimated from the formula. The r decreased with particle size because of the size effect of BaTiO3 and high tetragonality and density was essential to obtain high r of powders.
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Document Type: Research Article
Affiliations: Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Tokyo 152-8552, Japan
Publication date: 2006-04-01