| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1487737 | Materials Research Bulletin | 2015 | 5 Pages |
•La3+ substitution for Bi3+ in Nb doped Bi4Ti3O12–SrBi4Ti4O15 ferroelectrics is reported.•The orthorhombic distortion of the structure decreased with the increasing La.•La acts as a grain growth inhibitor in the ceramics.•The remnant polarization of the ferroelectrics increased significantly with La substitution.
The effect of La substitution on the electrical properties of SrLaxBi8−xTi6.88Nb0.12O27 intergrowth Aurivillius phase ferroelectric ceramic was investigated. La content ‘x’ was ranging from 0.0 to 1.0 in a step of 0.2. The ceramic phase was synthesized through a modified oxalate route. X-ray diffraction was used to identify the phase and to investigate the change in lattice parameter and microstrain with the substitution. La-substitution does not affect the crystal structure of the intergrowth. Microstructural investigation revealed that the grain size of the ceramic decreases with La addition. The lattice parameters and orthorhombicity of intergrowth structure were found to decrease with increasing La substitution. The temperature dependence of dielectric behavior was investigated in the temperature range 30–700 °C and the frequency of 100 kHz. The remnant polarization 2Pr increased and the Curie temperature Tc decreased with the increase in the La substitution.
Graphical abstractThe ferroelectric properties of Nb modified Bi4Ti3O12–SrBi4Ti4O15 intergrowth ceramics increases significantly when Bi is substituted by La.Figure optionsDownload full-size imageDownload as PowerPoint slide
