Correlation between lattice distortion and magnetic and electrical properties of Fe-doped Bi4Ti3O12 ceramics
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Aurivillius phase Bi4Ti3O12–xFe2O3 (BIT–xFe, x = 0–0.08) ceramics were prepared by conventional solid-state method. The crystallographic evolution was determined via the X-ray diffraction patterns, by which the lattice parameters, a, b and c were also calculated. It was found that the increasing content of Fe2O3 reduced the lattice distortion of BIT-based ceramics, which led to a phase transition from orthorhombic to tetragonal. Ferroelectricity and magnetization data showed that BIT–xFe ceramics possess expected ferroelectric and ferromagnetic behaviors. Besides, the grain size decreased as structure changed from rod-like to sphere with increasing x, which can be observed in the SEM. The dielectric constant can be analyzed by a “brick-wall” model, the dielectric loss and dc conductivity had a tendency to decrease with increasing x.
KeywordsFe2O3 Bismuth Dielectric Loss BiFeO3 Lattice Distortion
This research was supported by the National Natural Science Foundation of China (51372144) and the Key Program of Innovative Research Team of Shaanxi Province (2014KCT-06).
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