Monoclinic symmetry at the nanoscale in lead-free ferroelectric BaZrTiO ceramics
arXiv:2205.06146 · doi:10.1103/PhysRevB.105.174202
Abstract
Local structural symmetries play a key role in the functionalities of ferroelectric materials and are often found different from average symmetry. Here, we study the real space nanoscale structure in Pb-free BaZrTiO (x 0.10) by pair distribution function measurements, complemented by transmission electron microscopy and x-ray diffraction. Our observations show existence of the rhombohedrally distorted unit cells; however, at intermediate length scales, at least up to 5 nm, there exist nano-scale correlated regions of monoclinic symmetry. This is complemented by the observation of curved frustrated nanodomains. Further, the average structure is found to have coexisting monoclinic and rhombohedral symmetries. Our observation of a two-phase ferroelectric state is in contrast to interferroelectric instabilities of conventional polymorphic phase boundaries reported for doped BaTiO.
arXiv comment7 pages, 6 figures
References in corpus (10)
- PDFgetX3: A rapid and highly automatable program for processing powder diffraction data into total scattering pair distribution functions
- Finite-Temperature Properties of Ba(Zr,Ti)O Relaxors From First Principles
- Orbital correlations in the pseudo-cubic \emph{O} and rhombohedral -phases of LaMnO
- A combined theoretical and experimental study of the low temperature properties of BaZrO3
- Emergence of long-range order in BaTiO3 from local symmetry-breaking distortions
- EXAFS study of lead-free relaxor ferroelectric BaTi(1-x)Zr(x)O3 at the Zr K-edge
- Local structural origins of the distinct electronic properties of Nb-substituted SrTiO and BaTi
- BZT:a soft pseudo-spin glass
- Stabilization of Polar Nano Regions in Pb-free ferroelectrics
- Coexistence of local structural heterogeneities and long-range ferroelectricity in Pb-free (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ceramics