期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 14, 页码 9231-9241出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01539
关键词
piezoelectric; lead-free; defect engineering; lattice distortion; temperature-stability
资金
- National Nature Science Foundation of China [11272102, 51471057]
- Open Project of Key Laboratory of Engineering Dielectrics and Its Application [DJZ201401]
The high piezoelectricity of ABO(3)-type lead-free piezoelectric materials can be achieved with the help of either morphotropic phase boundary (MPB) or polymorphic phase transition (PPT). Here, we propose a new defect engineering route to the excellent piezoelectric properties, in which doped smaller acceptor and donor ions substituting bivalent A-sites are utilized to bring local lattice distortion and lower symmetry. A concrete paradigm is presented, (Li-Al) codoped BaTiO3 perovskite, that exhibits a largely thermo-stable piezoelectric constant (>300 pC/N) and huge mechanical quality factor (>2000). A systematic analysis including theoretical analysis and simulation results indicates that the Li+ and Al3+ ions are inclined to occupy the neighboring A-sites in the lattice and constitute a defect dipole (ionic pairs). The defect dipoles possess a kind of dipole moment which tends to align directionally after thermo-electric treatment. A mechanism related to the defect symmetry principle, phase transition, and defect migration is proposed to explain the outstanding piezoelectric properties. The present study opens a new development window for excellent piezoelectricity and provides promising route to the potential utilization of lead-free piezoelectrics in high power applications.
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