Research Data Leeds Repository

Nanoscale compositional segregation and suppression of polar coupling in a relaxor ferroelectric - dataset

Roncal-Herrero, Teresa and Harrington, John and Zeb, Aurang and Milne, Steven J. and Brown, Andy P. (2018) Nanoscale compositional segregation and suppression of polar coupling in a relaxor ferroelectric - dataset. University of Leeds. [Dataset] https://doi.org/10.5518/426

Dataset description

A number of relaxor ferroelectric ceramics have been demonstrated to possess a near stable value of relative permittivity over very wide temperature ranges. This cannot be explained by conventional theories of relaxors. One such system is based on the perovskite solid solution series: (1-x) (Ba0.8Ca0.2)TiO3-xBi(Mg0.5Ti0.5)O3, giving stable relative permittivity from 150 to 500 °C. We show by scanning transmission electron microscopyand electron energy loss spectroscopic elemental mapping that nanoscale compositional segregation occurs in the temperature stable relaxor composition (x = 0.55), with Ba/Ti clusters some 2–4 nm in extent, separated by Bi-rich regions of comparable size. This nanomosaic structure is consistent with phase separation into a ferroelectrically active BaTiO3 – type phase (Ba/Ti rich) and a weakly polar Bi/(Mg) rich perovskite solid solution. The possibility that nanophase segregation is the cause of weak dipole coupling and suppression of the dielectric relaxation peak is considered.

Keywords:	Electron Microscope, high temperature, stable temperature relaxor ferroelectric, chemical segregsation, functional ceramics
Divisions:	Faculty of Engineering and Physical Sciences > School of Chemical and Process Engineering
Related resources:	Location Type https://doi.org/10.1016/j.actamat.2018.07.053 Publication http://eprints.whiterose.ac.uk/134846/ Publication
License:	Creative Commons Attribution 4.0 International (CC BY 4.0)
Date deposited:	26 Oct 2018 15:36
URI:	http://archive.researchdata.leeds.ac.uk/id/eprint/442
Additional details Additional details Creators: Creators ORCID Other ID Email Primary affiliation Primary affiliation ID Primary affiliation ID type Secondary affiliation Secondary affiliation ID Secondary affiliation ID type Roncal-Herrero, Teresa https://orcid.org/0000-0002-3673-6904 University of Leeds https://doi.org/10.13039/501100000777 Crossref Harrington, John https://orcid.org/0000-0003-1403-4423 University of Leeds https://doi.org/10.13039/501100000777 Crossref Zeb, Aurang Islamia College Peshawar Milne, Steven J. https://orcid.org/0000-0002-1365-7365 University of Leeds https://doi.org/10.13039/501100000777 Crossref Brown, Andy P. https://orcid.org/0000-0001-9692-2154 University of Leeds https://doi.org/10.13039/501100000777 Crossref Type of data: Dataset Research funders: Engineering and Physical Sciences Research Council Grant numbers: EP/P015514/1 Publication date: 2018 Resource language: English Metadata language: English Publisher: University of Leeds Contact Email Address: S.J.Milne@leeds.ac.uk Last Modified: 07 Feb 2019 10:05

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