Abstract
In this work, ferroelectric domain structures of <001 >-oriented K0.15Na0.85NbO3 single crystal are characterized. Transmission electron microscopy (TEM) observation revealed high-density of laminate domain structures in the crystal and the lattices of the neighboring domains are found to be twisted in a small angle. Superlattice diffraction spots of 12{eeo} and 12{ooe} in electron diffraction patterns are observed in the crystal, revealing the a+a+c− tilting of oxygen octahedral in the perovskite structure. The piezoresponse of domains and in-situ poling responses of K0.15Na0.85NbO3 crystal are observed by piezoresponse force microscopy (PFM), and the results assure its good ferroelectric properties.
Highlights
Lead zirconate titanate (Pb(Zr1−xTix)O3 (PZT) ceramics are the most extensively used piezoelectric materials because of their good piezoelectric properties
Transmission electron microscopy (TEM) observation revealed high-density of laminate domain structures in the crystal and the lattices of the neighboring domains are found to be twisted in a small angle
Superlattice diffraction spots of 1/2{eeo} and 1/2{ooe} in electron diffraction patterns are observed in the crystal, revealing the a+a+c− tilting of oxygen octahedral in the perovskite structure
Summary
Lead zirconate titanate (Pb(Zr1−xTix)O3 (PZT) ceramics are the most extensively used piezoelectric materials because of their good piezoelectric properties. Leadfree piezoelectric materials have been drawn much attention due to their environment friendly.[1,2] KxNa1−xNbO3-based (KNN) system is considered as one of the most promising candidates of lead-free piezoelectric owing to its good ferroelectric properties and high Curie temperature (Tc =420oC).[2,3,4] A lot of investigations have been focusing on modifying the piezoelectric properties of KNN ceramics by doping metal ions, introducing perovskite oxides to form new solid solution and adopting different sintering methods such as hot pressing and spark plasma.[5] Besides KNN ceramics, the KNN-based single crystals have been grown to further improve the piezoelectric properties, because single crystals can be poled along different directions by domain engineering method.[6,7,8,9] The behavior of a ferroelectric is mainly dependent on the local domain response by applying an electrical loading. Reports to investigate the detailed local structures, such as the domain morphology and domain boundary, of the KNN single crystal. The amplitude-voltage butterfly loop and phase-voltage loop were evaluated
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