Abstract
Aurivillius-type Bi4Ti3-xWx/2Nbx/2O12 ceramics were prepared by a conventional solid-state sintering method. The XRD patterns demonstrated that all compositions were a single three layered crystalline structure, involving a reduction of lattice distortion with an increase in W/Nb doping level. The electrical properties including dielectric, electrical conduction and piezoelectric properties were tailored by W/Nb additives. The Curie-temperature decreased, whereas the electrical resistivity drastically increased with introduction of W/Nb donor dopants. As a result, a high electric field can be applied during the poling process. The Bi4Ti2.9W0.05Nb0.05O12 ceramics exhibited optimum piezoelectric coefficient (d33 ∼22.8pC/N), large remnant polarization (2Pr ∼26.8μC/cm2@200°C) together with a high Curie temperature (TC ∼635°C). Furthermore, this composition possessed a wide sintering window with outstanding piezoelectric properties. These parameters indicate that Bi4Ti2.9W0.05Nb0.05O12-based ceramic is a promising candidate for high temperature piezoelectric applications.
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