Ferroelectric, Ferroelastic and Multiferroic Domain Walls: a New Horizon in Nanoscale Functional Materials
Lead Research Organisation:
University of St Andrews
Department Name: Chemistry
Abstract
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Publications
Gardner J
(2019)
Tin titanate-the hunt for a new ferroelectric perovskite.
in Reports on progress in physics. Physical Society (Great Britain)
Gradauskaite E
(2017)
Lead palladium titanate: A room-temperature multiferroic
in Physical Review B
Howieson G
(2021)
Structural phase transitions in the geometric ferroelectric LaTa O 4
in Physical Review B
Howieson G
(2020)
Incommensurate-Commensurate Transition in the Geometric Ferroelectric LaTaO 4
in Advanced Functional Materials
Kumari S
(2021)
Room-temperature large magnetoelectricity in a transition metal doped ferroelectric perovskite
in Physical Review B
McCartan S
(2020)
Anisotropic, meandering domain microstructure in the improper ferroelectric CsNbW2O9
in APL Materials
McNulty J
(2020)
Phase transitions in the hexagonal tungsten bronze RbNbW2O9
in Journal of Solid State Chemistry
McNulty J
(2020)
Corrigendum to: "Phase transitions in the hexagonal tungsten bronze RbNbW2O9" [J. Solid State Chem. 286 (2020) 121275]
in Journal of Solid State Chemistry
McNulty J
(2020)
Local Structure and Order-Disorder Transitions in "Empty" Ferroelectric Tetragonal Tungsten Bronzes
in Chemistry of Materials
McNulty JA
(2019)
An Electronically Driven Improper Ferroelectric: Tungsten Bronzes as Microstructural Analogs for the Hexagonal Manganites.
in Advanced materials (Deerfield Beach, Fla.)
| Description | Two new commercially useful device materials: Tin titanate and lead-palladium-titanate. We have added a further new material with previously unreported ferroelectric properties, caesium niobium oxide, and have uncovered important structural information about another material, lanthanum tantalite which has potential as a high temperature piezoelectric. |
| Exploitation Route | Transducer and memory devices. |
| Sectors | Electronics |
| Description | We have fabricated and tested three new ferroelectric titanate materials: tin titanate, palladium-lead titanate, and ultra-tetragonal lead titanate. The latter compound has a polarization P of 238 microCoulombs/square centimeter, nearly twice that of anything previously known in nature. Since the size of such devices (e.g., for computer memories and cell phones) is 50% smaller if P is 50% larger, this may have immediate commercial applications. Prof. Scott previously was co-inventor and developer of ferroelectric memories, which are now a £100 million/year commercial market in Japan and the USA (subway fare cards, vending machines, cash points), and his present EPSRC project is to enhance such devices by making them smaller and hence use less power (longer battery life, more ecologically friendly). |
| First Year Of Impact | 2017 |
| Sector | Electronics |
| Impact Types | Economic,Policy & public services |
| Title | An electronically-driven improper ferroelectric: tungsten bronzes as microstructural analogues for the hexagonal manganites (dataset) |
| Description | |
| Type Of Material | Database/Collection of data |
| Year Produced | 2019 |
| Provided To Others? | Yes |
| Title | Anisotropic, meandering domain microstructure in the improper ferroelectric CsNbW2O9 |
| Description | |
| Type Of Material | Database/Collection of data |
| Year Produced | 2020 |
| Provided To Others? | Yes |
| URL | http://researchdata.gla.ac.uk/id/eprint/1052 |
| Title | Data relating to article "Octahedral Tilting in the Polar Hexagonal Tungsten Bronzes RbNbW2O9 and KNbW2O9" |
| Description | Cifs related to the room temperature structures of RbNbW2O9 and KNbW2O9 as determined from powder neutron diffraction. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2019 |
| Provided To Others? | Yes |
| URL | https://risweb.st-andrews.ac.uk/portal/en/datasets/data-relating-to-article-octahedral-tilting-in-th... |
| Title | Data underpinning 'Quantum Critical Points in Ferroelectric Relaxors: Stuffed Tungsten Bronze K3Li2Ta5O15 and Lead Pyrochlore (Pb2Nb2O7)' |
| Description | |
| Type Of Material | Database/Collection of data |
| Year Produced | 2018 |
| Provided To Others? | Yes |
| Title | Dataset for Phonon-Glass and Heterogeneous Electrical Transport in A-Site Deficient SrTiO3 |
| Description | |
| Type Of Material | Database/Collection of data |
| Year Produced | 2019 |
| Provided To Others? | Yes |
| Title | Local structure and order-disorder transitions in 'empty' ferroelectric tetragonal tungsten bronzes (dataset) |
| Description | |
| Type Of Material | Database/Collection of data |
| Year Produced | 2019 |
| Provided To Others? | Yes |
| URL | https://risweb.st-andrews.ac.uk/portal/en/datasets/local-structure-and-orderdisorder-transitions-in-... |
| Title | Phase Transitions in the Hexagonal Tungsten Bronze RbNbW2O9 (dataset) |
| Description | Cifs related to the refined structures as determined from powder neutron data. Raw electrical data |
| Type Of Material | Database/Collection of data |
| Year Produced | 2019 |
| Provided To Others? | Yes |
| URL | https://risweb.st-andrews.ac.uk/portal/en/datasets/phase-transitions-in-the-hexagonal-tungsten-bronz... |
| Title | Unidentified Phase Transition in Polar Lanthanum Tantalate (LaTaO4) |
| Description | The family of crystals with formula ABX4 represent a very interesting class of ferroelectrics that are extremely two-dimensional. Fluorides have been extensively researched but there is great potential for oxides of this class, such as LaTaO4, due to oxides being favoured for device applications. Studies have reported the evolution of morphologies of LaTaO4 with temperature, but one phase transition at ~200ºC is accompanied by an anomalously small peak in permittivity, which suggests the transition is unusual. Variable temperature XRD of this material has revealed a change in lattice parameters which coincide with the phase transition but this is suspected to be a consequence of a shift in oxygen positions. It is then suggested that by using HRPD, the change in oxygen positions can be observed across the phase transition and hence the structural distortion can be characterised. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2018 |
| Provided To Others? | Yes |
| URL | https://data.isis.stfc.ac.uk/doi/STUDY/103198140/ |
| Description | Collaboration with the University of Glasgow |
| Organisation | University of Glasgow |
| Department | Physics and Astronomy Department |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | We synthesised a new improper ferroelectric material which we hypothesised would exhibit the same complex domain structure as the hexagonal managanite improper ferroelectrics. |
| Collaborator Contribution | Dr Ian MacLaren and his PhD student, Shane McCartan, carried out electron microscopy on our samples. The results of this analysis was included in two publications. |
| Impact | Multi-disciplinary: chemistry and physics Anisotropic, meandering domain microstructure in the improper ferroelectric CsNbW2O9 Shane J. McCartan, Patrick W. Turner, Jason A. McNulty, Jesi R. Maguire, Conor J. McCluskey, Finlay D. Morrison, J. Marty Gregg and Ian MacLaren APL Mater., 8, 101108, 2020. DOI: 10.1063/5.0026040 An Electronically Driven Improper Ferroelectric: Tungsten Bronzes as Microstructural Analogs for the Hexagonal Manganites Jason A. McNulty, T. Thao Tran, P. Shiv Halasyamani, Shane J. McCartan, Ian MacLaren, Alexandra S. Gibbs, Felicia J. Y. Lim, Patrick W. Turner, J. Marty Gregg, Philip Lightfoot, and Finlay D. Morrison Adv. Mater., 31, 1903620, 2019. DOI: 10.1002/adma.201903620 |
| Start Year | 2018 |
| Description | Invited lectures at international conferences |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Professional Practitioners |
| Results and Impact | 2) Plenary keynote addresses at international conferences: a) Ferroics 2018 (Washington, DC, January 2018) b) EPSRC group-sponsored conference: Castle Leslie, Ireland (January 2018) c) International Symposium on Integrated Ferroelectrics (ISIS), Delhi, December 2017 d) (to be given) European Conference on Applications of polar Dielectrics (Moscow, 28 June 2018) e) (to be given) European Meeting on Ferroelectrics (Warsaw, 8 September 2018) |
| Year(s) Of Engagement Activity | 2017,2018 |