Abstract
The crystalline structure and dielectric and piezoelectric properties of SrBi2Nb2O9 (SBN)-based materials were investigated with the substitution of Ca and Ba ions into the Sr site in this study. X-ray diffraction analysis revealed that these substitutes formed solid solutions throughout the compositions. The Ca substitution increases the ferroelectric transition temperature and maintains the phase transition as that of the normal ferroelectrics, while the Ba substitution lowers the ferroelectric transition temperatures and changes the transition from the normal to the diffuse ferroelectric one. The Ba-substituted SBN shows a smooth elastic anomaly for the Ba substitution of 0.2. A dielectric measurement revealed that the smooth elastic anomaly might be related to small dielectric dispersion characteristics observed around 300°C.
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