ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Oxide ion conductivity in a geometric ferroelectric
Abstract: Lanthanum tantalate, LaTaO4, is one of the few oxide examples of an n = 2 member of the Carpy-Galy phases of general formula AnBnX3n+2. These are 2-dimensional perovskite-related materials where the perovskite network disrupted by introducing ?excess? anions resulting in the formation of perovskite layers n-octahedra deep. LaTaO4 is unusual in that on heating it successively transforms from non-polar monoclinic to incommensurate polar orthorhombic at ca. 440 K to commensurate polar orthorhombic at 500 K. These transitions result from a change in tilting of the octahedral units in the perovskite layers and is therefore an example of a ?geometric? ferroelectric. Selective doping with Ce at the La-site and subsequent controlled partial oxidation of Ce (+III) to Ce (+IV) gives rise to interstitial oxide ions in between the perovskite layers and results in oxide ion conductivity. It is proposed that the geometric mechanism of ferroelectricity in this structure should therefore be robust to the presence of these additional charge carriers. The aim of this study is to determine the influence of both Ce(III)-doping and partial oxidation to Ce(IV) on the structural evolution, and stability of the ferroelectric phase, of LaTaO4.
Principal Investigator: Professor Finlay Morrison
Experimenter: Ms Kim-Isabelle Mehnert
Experimenter: Mr Toby Fairs
Local Contact: Dr Ronald Smith
Experimenter: Mr Blair Kennedy
DOI: 10.5286/ISIS.E.RB2420426
ISIS Experiment Number: RB2420426
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2420426-1 | POLARIS | 19 March 2028 | Download |
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
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[author], [date], [title], [publisher],
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For Example:
Professor Finlay Morrison et al; (2025): Oxide ion conductivity in a geometric ferroelectric, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2420426
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