Bond valence structure analysis of doped bismuth sodium titanate

This study focuses on a lead free, high temperature ceramic capacitor material having the base composition of (Bi/sub 0.5/Na/sub 0.5/)TiO/sub 3/. The goal is to modify this structure to create a material that has X7R-like dielectric behavior, while maintaining its inherently good high temperature dielectric properties. This will alleviate some design problems and create a component that is less susceptible to drastic environmental changes. Industrial areas of interest include aerospace, well drilling and automotive. An extensive compositional experiment, along with theoretical modeling has been investigated to modify the base material to attain the goals set forth. A combination of dopants including barium, strontium, and tin, were used to modify the dielectric properties. The dielectric properties were promising, however the low temperature relative permittivity is still too low to meet the goal of the project.