Origin of high piezoelectric response in A-site disordered morphotropic phase boundary composition of lead-free piezoelectric 0.93(Na0.5Bi0.5)TiO3-0.07BaTiO(3)

TR Number
Date
2013-03-21
Journal Title
Journal ISSN
Volume Title
Publisher
American Institute of Physics
Abstract

Perovskite piezoelectric compositions near the morphotropic phase boundary (MPB) are known to exhibit high piezoelectric response. In lead-based ABO(3) compound with B-site disorder, the origin of this enhancement has been associated with the presence of an intermediate monoclinic/orthorhombic state that bridges the adjacent ferroelectric rhombohedral and tetragonal phases. However, the origin of high piezoelectric response in lead-free ABO(3) compounds with A-site disorder has not been conclusively established. We describe a microscopic model derived from comparative analyses of high resolution transmission electron microscopy and neutron diffraction that explains the origin of high piezoelectric response in lead-free MPB compositions of 0.93(Na0.5Bi0.5)TiO3-0.07BaTiO3. Direct observation of nanotwins with monoclinic symmetry confirmed the presence of an intermediate bridging phase that facilitates a pathway for polarization reorientation. Monoclinic distortions of an average rhombohedral phase are attributed to localized displacements of atoms along the non-polar directions. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4792729]

Description
Keywords
Whiskers, Phase transitions, Piezoelectric fields, Ferroelectric phase transitions, Ferroelectricity
Citation
Journal of Applied Physics 113, 114101 (2013); doi: 10.1063/1.4792729
Priya, Shashank (2013). Origin of high piezoelectric response in A-site disordered morphotropic phase boundary composition of lead-free piezoelectric 0.93(Na0.5Bi0.5)TiO3-0.07BaTiO(3). Journal of Applied Physics, 113(11). doi: 10.1063/1.4792729