Atomistic origin of huge response functions at the morphotropic phase boundary of (1-x)Na0.5Bi0.5TiO3-xBaTiO(3)

Datta K, Richter A, Göbbels M, Neder R, Mihailova B (2014)

Publication Status: Published

Publication Type: Journal article

Publication year: 2014

Journal

Physical Review B American Physical Society

Publisher: AMER PHYSICAL SOC

Book Volume: 90

Journal Issue: 6

DOI: 10.1103/PhysRevB.90.064112

Abstract

The ferroelectric solid solution (1 - x)Na0.5Bi0.5TiO3-BaTiO3 (NBT-xBT) is a promising material to substitute for the environmentally undesired Pb-based ferroelectrics. The strong enhancement of the dielectric permittivity and piezoelectric coefficients near the morphotropic phase boundary (MPB) in ferroelectric ABO(3)-type solid solutions is commonly related to the existence of a single or several long-range-ordered phases resulting in a complex nanodomain pattern. Here, NBT-xBT is studied by Raman scattering and complementary synchrotron x-ray total elastic scattering to follow the temperature evolution of the mesoscopic-scale structural transformations for x below, at, and slightly above x(MPB). The most remarkable result is that at x similar to x(MPB) the phonon mode involving vibrations of both off-centered A-site Bi and B-site Ti experiences strong softening and damping near the triple-point temperature in the phase diagram, in strong contrast to the compounds with x < x(MPB) or x > x(MPB). The chemically enhanced coupling between the Bi and Ti subsystems at x(MPB) is facilitated by the subtle disturbance of the coupling processes within the Bi subsystem induced by Ba at x(MPB). These mesoscopic-scale structural and dynamic phenomena seem to be significant for the enhanced response functions at the MPB in NBT-xBT.

Authors with CRIS profile

Kaustuv Datta Lehrstuhl für Kristallographie und Strukturphysik (ICSP) Andreas Richter Lehrstuhl für Mineralogie Matthias Göbbels Lehrstuhl für Mineralogie Reinhard Neder Professur für Allgemeine Mineralogie/Kristallographie

Involved external institutions

Universität Hamburg (UHH) DE Germany (DE)

How to cite

APA:

Datta, K., Richter, A., Göbbels, M., Neder, R., & Mihailova, B. (2014). Atomistic origin of huge response functions at the morphotropic phase boundary of (1-x)Na0.5Bi0.5TiO3-xBaTiO(3). Physical Review B, 90(6). https://doi.org/10.1103/PhysRevB.90.064112

MLA:

Datta, Kaustuv, et al. "Atomistic origin of huge response functions at the morphotropic phase boundary of (1-x)Na0.5Bi0.5TiO3-xBaTiO(3)." Physical Review B 90.6 (2014).

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