X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, and an impedance analyzer were used to examine the Nb-Co codoping effects on the densification, crystalline phase, microstructure development, and dielectric-temperature characteristics of BaTiO3-(Bi 0.5Na0.5)TiO3 ceramics. The results indicate that the Curie temperature shifted to a higher temperature (above 140°C) by adding BNT. The dielectric constant-temperature (ε-T) curve broadened at the Curie temperature due to the small grain size (0.3-0.4 μm). A core-shell structure was developed, which is helpful to flatten the ε-T curve of BaTiO3 ceramics at high temperatures.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry