The Role of Trilinear Couplings in the Phase Transitions of Aurivillius Compounds

Etxebarria, I.; Perez-Mato, J. M.; Boullay, Philippe

doi:10.1080/00150191003670325

Cited by 51 publications

(52 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is important to note that the trilinear term is not required to 'switch on' P , R 1 and R 2 , but it may in some cases [46]. That is, in most cases the two rotation distortions are both individually unstable, so the βR 2 1 and δR 2 2 terms in the free energy have β and δ negative at T = 0.…”

Section: (Srtiomentioning

confidence: 99%

“…The primary and secondary distortions may condense at the same temperature (in a so-called avalanche transition [46]), or there may be a series of phase transitions, where at one temperature one of the rotations condenses and then at a second temperature the second rotation condenses (technically, this second phase transition would be a proper ferroelectric transition; the work of Tagantsev on 'weak' ferroelectrics most likely describes this type of transition [48]). Further experimental and theoretical investigations are currently underway to clarify this important issue.…”

Section: (Srtiomentioning

confidence: 99%

See 1 more Smart Citation

Polar octahedral rotations: A path to new multifunctional materials

Benedek

Mulder

Fennie

2012

Journal of Solid State Chemistry

224

241

View full text Add to dashboard Cite

Perovskite ABO 3 oxides display an amazing variety of phenomena that can be altered by subtle changes in the chemistry and internal structure, making them a favorite class of materials to explore the rational design of novel properties. Here we highlight a recent advance in which rotations of the BO 6 octahedra give rise to a novel form of ferroelectricity -hybrid improper ferroelectricity. Octahedral rotations also strongly influence other structural, magnetic, orbital, and electronic degrees of freedom in perovskites and related materials. Octahedral rotation-driven ferroelectricity consequently has the potential to robustly control emergent phenomena with an applied electric field. The concept of 'functional' octahedral rotations is introduced and the challenges for materials chemistry and the possibilities for new rotationdriven phenomena in multifunctional materials are explored.

show abstract

Section: (Srtiomentioning

confidence: 99%

Section: (Srtiomentioning

confidence: 99%

Polar octahedral rotations: A path to new multifunctional materials

Benedek

Mulder

Fennie

2012

Journal of Solid State Chemistry

224

241

View full text Add to dashboard Cite

show abstract

“…This requires the simultaneous condensation of the two tilt modes M5 − (a − a − c 0 ) and M2 + (a 0 a 0 c + ), which couple with the polar mode, Γ5 − . This special case of tri-linear coupling has been termed an "avalanche transition" [19]. Due to the temperature increments used in this experiment, we cannot fully rule out a possible intermediate phase of symmetry Pmam or P4/mbm but, if present, this must only exist in a narrow temperature interval around 700 to 750 °C.…”

Section: Discussionmentioning

confidence: 99%

“…This requires the simultaneous condensation of the two tilt modes M 5 − (a − a − c 0 ) and M 2 + (a 0 a 0 c + ), which couple with the polar mode, Γ 5 − . This special case of tri-linear coupling has been termed an "avalanche transition" [19]. ruled out these pathways by the observation of a clear SHG signal, signifying non-centrosymmetricity, and thus implying an avalanche transition in this composition also.…”

Section: Discussionmentioning

confidence: 99%

Phase Transition Behavior of the Layered Perovskite CsBi0.6La0.4Nb2O7: A Hybrid Improper Ferroelectric

et al. 2017

View full text Add to dashboard Cite

Abstract:The phase behavior of the layered perovskite CsBi 0.6 La 0.4 Nb 2 O 7 , of the Dion-Jacobson family, has been studied by high-resolution powder neutron diffraction between the temperatures of 25 < T < 850 • C. At ambient temperature, this material adopts the polar space group P2 1 am; this represents an example of hybrid improper ferroelectricity caused by the interaction of two distinct octahedral tilt modes. Within the limits of our data resolution, the thermal evolution of the crystal structure is consistent with a first-order transition between 700 and 750 • C, with both tilt modes vanishing simultaneously, leading to the aristotype space group P4/mmm. This apparent "avalanche transition" behavior resembles that seen in the related Aurivillius phase SrBi 2 Nb 2 O 9 .

show abstract

“…Still at this stage several important questions remain open regarding these materials. For example uncertainties remain concerning their finite temperature properties and in particular the phase transition mechanism [109]: for example are there single or consecutive phase transitions, or an avalanche mechanism [120]? Another central issue also concerns the ferroelectric switching path and associated energy barrier.…”

Section: Toward Electric Control Of the Magnetizationmentioning

confidence: 99%

Novel magneto-electric multiferroics from first-principles calculations

Varignon

Bristowe

Bousquet

et al. 2015

Comptes Rendus. Physique

View full text Add to dashboard Cite

Interest in first-principles calculations within the multiferroic community has been rapidly on the rise over the last decade. Initially considered as a powerful support to explain experimentally observed behaviours, the trend has evolved and, nowadays, density functional theory calculations has become also an essential predicting tool for identifying original rules to achieve multiferroism and design new magneto-electric compounds. This chapter aims to highlight the key advances in the field of multiferroics for which first-principles methods have contributed significantly. The essential theoretical developments that made this search possible are also briefly presented.To cite this article: J. Varignon, N. C. Bristowe, E. Bousquet and Ph. Ghosez, C. R. Physique # (2014). RésuméNouveaux matériaux multiferroïques à partir de calculs de premiers principes.L'intérêt pour les calculs ab initio dans la communauté des multiferroïques n'a cessé de croître au cours de la dernière décennie. Initialement considérés comme un support efficace pour expliquer les comportements observés expérimentalement, la tendance a évolué et, actuellement, les calculs réalisés dans le cadre de la théorie de la fonctionnelle de la densité apparaissent aussi comme un outil prédictif incontournable permettant d'identifier de nouvelles voies pour parvenir au multiferroïsme et créer de nouveaux matériaux magnéto-électriques. Ce chapitre vise à présenter quelques avancées clefs dans le domaine des multiferroïques, auxquelles les méthodes ab initio ont conbribué de manière significative. Les développements théoriques essentiels ayant permis ces avancées sont aussi brièvement discutés.

show abstract

The Role of Trilinear Couplings in the Phase Transitions of Aurivillius Compounds

Cited by 51 publications

References 8 publications

Polar octahedral rotations: A path to new multifunctional materials

Polar octahedral rotations: A path to new multifunctional materials

Phase Transition Behavior of the Layered Perovskite CsBi0.6La0.4Nb2O7: A Hybrid Improper Ferroelectric

Novel magneto-electric multiferroics from first-principles calculations

Contact Info

Product

Resources

About