Piezoelectric, pyroelectric, dielectric and ferroelectric properties of Ba0.3Na0.7Ti0.3Nb0.7O3

Abdelkefi, Helmi; Khemakhem, H.; Simon, A.; Maglione, Mario

doi:10.1063/1.2818146

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…BaTiO 3 as a common and typical ferroelectric is chosen to be the host material in the present work. The conventional substitutions in the A- and/or B-sites have been confirmed to be effective approaches of improving the piezoelectric performance of BaTiO 3 based ceramics. − However, the decrease of T C is generally associated with the enhanced d 33 . It is also difficult for BaTiO 3 to form the excellent piezoelectric solid solution with the help of other ABO 3 (NBT, KNN, and so on) systems. , Moreover, special sintering techniques (microwave sintering, two-step sintering, or spark plasma sintering) can also bring excellent piezoelectric performance in the BaTiO 3 based ceramics without the decrease of T C . − Under these circumstances, the enhanced piezoelectric performance comes from the extrinsic contributions, which is related to the nanodomain structures and/or submicron grain.…”

Section: Resultsmentioning

confidence: 99%

Defect Engineering of Lead-Free Piezoelectrics with High Piezoelectric Properties and Temperature-Stability

Feng

et al. 2016

ACS Appl. Mater. Interfaces

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The high piezoelectricity of ABO3-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 Al(3+) 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 a promising route to the potential utilization of lead-free piezoelectrics in high power applications.

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