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Influence of tetragonal platelets on the dielectric permittivity of0.964Na1/2Bi1/2TiO3−0.036BaTiO3

Pforr, Florian and Major, Márton and Donner, Wolfgang and Stuhr, Uwe and Roessli, Bertrand (2016):
Influence of tetragonal platelets on the dielectric permittivity of0.964Na1/2Bi1/2TiO3−0.036BaTiO3.
In: Physical Review B, American Physical Society, pp. 94.014105, 94, (1), ISSN 2469-9950,
[Online-Edition: http://doi.org/10.1103/PhysRevB.94.014105],
[Article]

Abstract

We study the temperature-dependent evolution of the octahedral tilt order in a lead-free relaxor ferroelectric and its impact on the ferroelectric properties. Using diffuse neutron scattering on a 0.964Na1/2Bi1/2TiO3−0.036BaTiO3 single crystal, we suggest a model for the temperature-dependent nanostructure of this perovskite that features chemically pinned tetragonal platelets embedded in the rhombohedral matrix, often separated by a cubic intermediate phase. Our results show a clear correlation between the squared thickness of the tetragonal platelets and the dielectric permittivity. This is interpreted as a sign for increased polarizability of the strained and distorted lattice at the center of the tetragonal platelets.

Item Type: Article
Erschienen: 2016
Creators: Pforr, Florian and Major, Márton and Donner, Wolfgang and Stuhr, Uwe and Roessli, Bertrand
Title: Influence of tetragonal platelets on the dielectric permittivity of0.964Na1/2Bi1/2TiO3−0.036BaTiO3
Language: English
Abstract:

We study the temperature-dependent evolution of the octahedral tilt order in a lead-free relaxor ferroelectric and its impact on the ferroelectric properties. Using diffuse neutron scattering on a 0.964Na1/2Bi1/2TiO3−0.036BaTiO3 single crystal, we suggest a model for the temperature-dependent nanostructure of this perovskite that features chemically pinned tetragonal platelets embedded in the rhombohedral matrix, often separated by a cubic intermediate phase. Our results show a clear correlation between the squared thickness of the tetragonal platelets and the dielectric permittivity. This is interpreted as a sign for increased polarizability of the strained and distorted lattice at the center of the tetragonal platelets.

Journal or Publication Title: Physical Review B
Volume: 94
Number: 1
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2017 08:16
Official URL: http://doi.org/10.1103/PhysRevB.94.014105
Identification Number: doi:10.1103/PhysRevB.94.014105
Funders: This research project has been supported by the European Commission under the 7th Framework Programme through the “Research Infrastructures” action of the “Capacities” Programme, NMI3-II Grant No. 283883., This work was funded by the Deutsche Forschungsgemeinschaft (DFG) under SFB 595 “Electrical Fatigue in Functional Materials.”
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