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

Authors :
Bertrand Roessli
Wolfgang Donner
Marton Major
Uwe Stuhr
Florian Pforr
Source :
Physical Review B. 94
Publication Year :
2016
Publisher :
American Physical Society (APS), 2016.

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 $0.964{\mathrm{Na}}_{1/2}{\mathrm{Bi}}_{1/2}{\mathrm{TiO}}_{3}\text{\ensuremath{-}}0.036{\mathrm{BaTiO}}_{3}$ 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.

Details

ISSN :
24699969 and 24699950
Volume :
94
Database :
OpenAIRE
Journal :
Physical Review B
Accession number :
edsair.doi...........235dc6c872f468f8032c5b9a7ac26447
Full Text :
https://doi.org/10.1103/physrevb.94.014105