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Enhanced Electromechanical Properties of 0.65Bi1.05FeO3–0.35BaTiO3 Ceramics through Optimizing Sintering Conditions
Ist Teil von
Physica status solidi. A, Applications and materials science, 2020-06, Vol.217 (12), p.n/a
Ort / Verlag
Weinheim: Wiley Subscription Services, Inc
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Wiley Online Library
Beschreibungen/Notizen
Lead‐free piezoelectric 0.65Bi1.05FeO3–0.35BaTiO3 (BF–35BT) ceramics are synthesized via conventional solid‐state reaction by varying sintering dwell time (ts). The crystalline phase, microstructures, and piezoelectric properties of BF–35BT are evaluated at room temperature. BF–35BT ceramics with improved electrical properties in a narrow range of ts are obtained. Enhanced electromechanical properties are obtained in ceramics sintered at 1000 °C for 3 h. X‐ray diffraction reveals a single perovskite structure with pseudocubic symmetry. A prominent enhancement in remanent polarization (Pr) and coercive field (Ec) is obtained. Typical ferroelectric behaviors are obtained, whereas unipolar and bipolar strains are enhanced with increasing ts. The static piezoelectric constants (d33) = 187 pC N−1, whereas dynamic piezoelectric constants (d*33) = 387 pm V−1 at a field of 5 kV mm−1 with Curie temperature (TC) = 422 °C.
Pb‐free 0.65Bi1.05FeO3–0.35BaTiO3 (BF–35BT) piezoceramics are synthesized via conventional solid‐state reaction by varying sintering dwell time (ts) to study its effect on electromechanical properties. ts has a profound effect on grain size and density of composition, showing that for ts = 3 h, enhanced electromechanical properties are achieved with a maximum relative density of 96.61% and grain size of 5.41 μm.