Bismuth
ferrite–barium titanate (BF-BT) based ceramics have
attracted extensive attention due to its excellent energy conversion.
Recently it has been found that BF-BT based ceramics with large electrostrain
are usually accompanied by a special domain configuration in which
weak and strong piezoresponse domain grains coexist. In this work,
we purposefully constructed the special domain configuration in the
pseudocomposite ceramics of (1 – x)0.55BF-0.4BT-0.05BZN/x(0.7BF-0.3BT) (relaxor-like phase/ferroelectric phase,
RE/FE) by a “two-step” method. Macroproperty characterization
suggests that the critical component pseudocomposite ceramic (x = 50%) with the special domain structure can exhibit a
maximum electrostrain value (S ∼ 0.28%) at
6 kV/mm, almost 3-fold to that (S ∼ 0.1%)
of the two end members and 63% higher than that (S ∼ 0.17%) of the same component ceramic prepared by the “one-step”
method. Further mesoscopic structure results show that the “two-phase”
composite can induce the formation of grain dependent domain at nanoscale,
and just this special domain conformation is conducive to a significant
improvement in electrostrain. Therefore, the large strain in BF-BT-based
ceramics is mainly caused by the special microstructure rather than
component.
Most of attention has been paid to the electrical performance caused by doping, while the property regulation mechanism of the intrinsic contributions such as symmetry and tilt of oxygen octahedron...
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