Microstructure and dielectric properties of sintered Li-Nb-Ti-O solid solution ceramics having superstructure

Abstract

Effects of preparation conditions on the microstructures and periodicity of the superstructure for Li_1+xNb_1-xTi_xO₃ phase M polycrystals were investigated. Obtained specimens, mainly comprised of elongated plate-like grains, and their surfaces were found to be parallel to periodical domains. Sintered materials were found to contain Nb-doped Li₂TiO₃ based solid solution that was one of the end members in the phase diagram of constituent materials. Superperiodicity of phase M was found to be affected by the both chemical compositions and sintering conditions. The dielectric constant increased with increasing of periodicity of superstructures, which could be varied by the amount of Ti concentration.

Keywords:

• LiNbO₃
• TiO₂
• Superstructure
• Ceramics
• Dielectric property
• Sintering