ISIS Neutron and Muon Source Data Journal

Temperature-Dependent Analysis of Polar Nanostructures in High Temperature Relaxor Dielectrics

Abstract: A number of relaxor ferroelectric ceramics possess a near-stable relative permittivity over a wide temperature range, making them promising materials for electronic applications under extreme conditions. The physical basis of temperature stability is not explained by current theory. Electron microscopy suggests that local phase segregation produces polar and weakly polar nano-regions in the parent crystal lattice. These regions restrict nano-polar growth and ordering on cooling, maintaining the flat temperature response. We probe this local phase segregation in a perovskite solid solution series, (1-x)(Ba0.8Ca0.2)TiO3-xBi(Mg0.5Ti0.5)O3, across the temperature range of stable permittivity (150-500°C). Neutron PDF will probe the T-dependent changes in the local atomic structure. The aim is to obtain a nanostructure model for theoretical modelling and prediction of permittivity.

Principal Investigator: Dr Andrew Britton
Experimenter: Professor Sven Schroeder
Experimenter: Dr Steven Milne
Experimenter: Dr Teresa Roncal-Herrero
Local Contact: Professor David Keen
Experimenter: Miss Holly Abell
Experimenter: Dr Anton Goetzee-Barral
Experimenter: Miss Gunjan Das
Experimenter: Mr Arturs Pugejs

DOI: 10.5286/ISIS.E.RB1820291

ISIS Experiment Number: RB1820291

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Andrew Britton et al; (2018): Temperature-Dependent Analysis of Polar Nanostructures in High Temperature Relaxor Dielectrics, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1820291

Data is released under the CC-BY-4.0 license.