ISIS Neutron and Muon Source Data Journal

Oxygen Positional Disorder in the "Empty" Tetragonal Tungsten Bronze Ba4La0.67Nb10O30

Abstract: Ferroelectric tetragonal tungsten bronze oxides (TTBs) have been extensively studied for their application dielectric and non-linear optical devices. TTBs often exhibit structural (incommensurate) modulations which partially disrupt the long-range ferroelectric ordering and lead to relaxor behaviour. Recently we discovered a novel polar, commensurate TTB, Ba4La0.67Nb10O30, which displays relaxor behaviour. Electron diffraction shows that the oxygen positions are completely disordered; these local variations disrupt long range polar ordering resulting in a lack of macroscopic (ferroelectric) polarisation. Conventional diffraction analysis is insensitive to these local variations and so the aim of the current proposal is to probe the local structural variations as the material progresses from the relaxor to non-ferroelectric phase using total neutron scattering methods.

Principal Investigator: Professor Finlay Morrison
Experimenter: Dr Jason McNulty
Experimenter: Dr Jonathan Gardner
Experimenter: Dr Matthew Tucker
Experimenter: Dr Lucy Clark

DOI: 10.5286/ISIS.E.RB1520173

ISIS Experiment Number: RB1520173

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:
Professor Finlay Morrison et al; (2015): Oxygen Positional Disorder in the "Empty" Tetragonal Tungsten Bronze Ba4La0.67Nb10O30, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1520173

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