The structure and oxide/fluoride ordering of the ferroelectrics Bi2TiO4F2 and Bi2NbO5F

Needs, Richard L.; Dann, Sandra E.; Weller, Mark T.; Cherryman, Julian C.; Harris, Robin K.

doi:10.1039/b502499d

Cited by 34 publications

(58 citation statements)

References 17 publications

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“…Hydrothermal synthesis yields better sample quality than conventional solid-state reaction [24]. Bi 2 TiO 4 F 2 adopts the simple body-centered tetragonal structure in the space group I4/mmm [24] while Bi 2 NbO 5 F is proposed to adopt Pbca symmetry [25]. These centrosymmetric crystal structures contradict the requirement for the ferroelectricity.…”

Section: Regular or Random Anion Occupation Pattern In The Perovskitementioning

confidence: 88%

“…Later work presented the ferroelectric phase transitions at T C = 303, 283, and 284 K, respectively, but the relationship between the crystal structure and the ferroelectricity is still controversial. Hydrothermal synthesis yields better sample quality than conventional solid-state reaction [24]. Bi 2 TiO 4 F 2 adopts the simple body-centered tetragonal structure in the space group I4/mmm [24] while Bi 2 NbO 5 F is proposed to adopt Pbca symmetry [25].…”

Section: Regular or Random Anion Occupation Pattern In The Perovskitementioning

confidence: 99%

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Oxyfluoride Chemistry of Layered Perovskite Compounds

2012

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Abstract:In this paper, we review recent progress and new challenges in the area of oxyfluoride perovskite, especially layered systems including Ruddlesden-Popper (RP), Dion-Jacobson (DJ) and Aurivillius (AV) type perovskite families. It is difficult to synthesize oxyfluoride perovskite using a conventional solid-state reaction because of the high chemical stability of the simple fluoride starting materials. Nevertheless, persistent efforts made by solid-state chemists have led to a major breakthrough in stabilizing such a mixed anion system. In particular, it is known that layered perovskite compounds exhibit a rich variety of O/F site occupation according to the synthesis used. We also present the synthetic strategies to further extend RP type perovskite compounds, with particular reference to newly synthesized oxyfluorides, Sr 2 CoO 3 F and Sr 3 Fe 2 O 5+x F 2−x (x ~ 0.44).

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Section: Regular or Random Anion Occupation Pattern In The Perovskitementioning

confidence: 88%

Section: Regular or Random Anion Occupation Pattern In The Perovskitementioning

confidence: 99%

Oxyfluoride Chemistry of Layered Perovskite Compounds

2012

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“…Recently, although Needs et al still adopted the same space group, they thought the structures of Bi 2 NbO 5 F and Bi 2 TiO 4 F 2 are not as ideal as reported by Aurivillius according to the anion distributions or atomic positions [8]. Later, McCabe et al proposed a lower symmetry orthorhombic space group Pbca for the Bi 2 NbO 5 F phase [9].…”

Section: Introductionmentioning

confidence: 96%

“…Later, McCabe et al proposed a lower symmetry orthorhombic space group Pbca for the Bi 2 NbO 5 F phase [9]. Based on bond valence calculations, Needs et al [8] considered that F atoms tend to locate in the equatorial sites of Nb(O,F) 6 or Ti(O,F) 6 octahedra, but McCabe et al [9] suggested that F atoms prefer the apical sites for Bi 2 NbO 5 F. It has been reported that these three phases are ferroelectrics with Curie temperatures of 303, 283 and 284 K, respectively [10][11], but the relationship between the crystal structure and the ferroelectricity is still controversial. Unfortunately, the physichemical properties of Bi 2 NbO 5 F and Bi 2 TaO 5 F are rarely reported.…”

Section: Introductionmentioning

confidence: 99%

“…However, there still lack the corresponding experimental data to support these theoretical results. Traditionally, these AV-type layered oxyfluoride perovskites, Bi 2 MO 5 F (M = Nb, Ta) and Bi 2 TiO 4 F 2 , were prepared via high-temperature solid-state reactions [7][8][9][10][11]. However, some impurity phases, such as BiF 3 was exactly equal to that of 1 M NH 4 F solution [8].…”

Section: Introductionmentioning

confidence: 99%

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A new low-temperature solution route to Aurivillius-type layered oxyfluoride perovskites Bi2MO5F (M = Nb, Ta) as photocatalysts

Lei

Cheng

Gao

et al. 2017

Applied Catalysis B: Environmental

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Heteroanionic Materials by Design: Progress Toward Targeted Properties

et al. 2019

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The burgeoning field of anion engineering in oxide‐based compounds aims to tune physical properties by incorporating additional anions of different size, electronegativity, and charge. For example, oxychalcogenides, oxynitrides, oxypnictides, and oxyhalides may display new or enhanced responses not readily predicted from or even absent in the simpler homoanionic (oxide) compounds because of their proximity to the ionocovalent‐bonding boundary provided by contrasting polarizabilities of the anions. In addition, multiple anions allow heteroanionic materials to span a more complex atomic structure design palette and interaction space than the homoanionic oxide‐only analogs. Here, established atomic and electronic principles for the rational design of properties in heteroanionic materials are contextualized. Also described are synergistic quantum mechanical methods and laboratory experiments guided by these principles to achieve superior properties. Lastly, open challenges in both the synthesis and the understanding and prediction of the electronic, optical, and magnetic properties afforded by anion‐engineering principles in heteroanionic materials are reviewed.

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The structure and oxide/fluoride ordering of the ferroelectrics Bi2TiO4F2 and Bi2NbO5F

Cited by 34 publications

References 17 publications

Oxyfluoride Chemistry of Layered Perovskite Compounds

Oxyfluoride Chemistry of Layered Perovskite Compounds

A new low-temperature solution route to Aurivillius-type layered oxyfluoride perovskites Bi2MO5F (M = Nb, Ta) as photocatalysts

Heteroanionic Materials by Design: Progress Toward Targeted Properties

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