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Snedden, Alan; Hervoches, Charles H.; Lightfoot, Philip

doi:10.1103/physrevb.67.092102

Cited by 121 publications

(68 citation statements)

References 11 publications

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“…[16] Finally, an apparently direct transition from polar orthorhombic to centrosymmetric tetragonal at T C ; this type of transition is required to be firstorder by group theory and is still the subject of some controversy. [17,18] Crystal structure of the HT phase: In the earlier work of Watanabe [6] it was postulated that the crystal structure of HT-Bi 2 WO 6 was isomorphous to that of the ambient-temperature structure of the lanthanide-doped derivatives Bi 2Àx Ln x -WO 6 (approximate composition limits 0.3 < x < 1.3 for most lanthanides). [19] As outlined in the Introduction, Watanabes suggested structure of this phase has been shown to be erroneous, and the true structure has recently been established.…”

Section: Resultsmentioning

confidence: 99%

Unusual High‐Temperature Structural Behaviour in Ferroelectric Bi₂WO₆

McDowell

Knight

Lightfoot

2006

Chemistry A European J

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The crystal structure of Aurivillius phase ferroelectric Bi2WO6 has been studied in detail as a function of temperature by using high-resolution powder neutron diffraction. In agreement with an earlier study, a transition from space group P2(1)ab to B2cb occurs at about 660 degrees C. This transition corresponds to the loss of one octahedral tilt mode within the perovskite-like WO4 layer of the structure. A second, reconstructive, phase transition occurs around 960 degrees C, corresponding to the ferroelectric Curie point; in contrast to previous suggestions, the structure of this high-temperature phase contains layers of stoichiometry WO4, with WO6 octahedra sharing edges and corners, and with the fluorite-like Bi2O2 layers remaining essentially unchanged. This structure is closely related to that of the ambient temperature phase of lanthanide-doped derivatives, for example, Bi0.7Yb1.3WO6 recently reported. This phase-transition behaviour is in stark contrast to that of other members of the Aurivillius family, such as SrBi2Ta2O9 and Bi4Ti3O12, which retain the archetypal Aurivillius connectivity at all temperatures.

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Section: Resultsmentioning

confidence: 99%

Unusual High‐Temperature Structural Behaviour in Ferroelectric Bi₂WO₆

McDowell

Knight

Lightfoot

2006

Chemistry A European J

Self Cite

159

135

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“…Bi 5 Ti 3 FeO 15 (BTFO) is an example of the Aurivillius phase material with of n ¼ 4 (Bi 4 Ti 3 O 12 -BiFeO 3 ) and thus has a four-layered perovskite unit of (Bi 3 Ti 3 FeO 13 ) 2À sandwiched by two (Bi 2 O 2 ) 2þ layers along c-axis. 8 Previous work undertaken on BTFO has shown it to be both ferroelectric, with a Curie temperature of about 730 C, 9 and to possess antiferromagnetic order, with a Neel point of 80 K. 10 The magneto-electric coupling behavior 11 and an obvious magnetocapacitance effect 12 have also been observed. By Nd-doping 13 or by substituting Fe with the Co 14 BTFO, solid-solution films have been reported to exhibit ferromagnetism to some degree, although recent work 15,16 has shown that great care must be taken, when interpreting ferromagnetic responses, to eliminate the effects of ferromagnetic second phases, even at very low levels.…”

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confidence: 89%

The structural and piezoresponse properties of c-axis-oriented Aurivillius phase Bi5Ti3FeO15 thin films deposited by atomic vapor deposition

Zhang

Deepak

Keeney

et al. 2012

Applied Physics Letters

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The deposition by atomic vapor deposition of highly c-axis-oriented Aurivillius phase Bi 5Ti 3FeO 15 (BTFO) thin films on (100) Si substrates is reported. Partially crystallized BTFO films with c-axis perpendicular to the substrate surface were first deposited at 610°C (8 excess Bi), and subsequently annealed at 820°C to get stoichiometric composition. After annealing, the films were highly c-axis-oriented, showing only (00l) peaks in x-ray diffraction (XRD), up to (0024). Transmission electron microscopy (TEM) confirms the BTFO film has a clear layered structure, and the bismuth oxide layer interleaves the four-block pseudoperovskite layer, indicating the n 4 Aurivillius phase structure. Piezoresponse force microscopy measurements indicate strong in-plane piezoelectric response, consistent with the c-axis layered structure, shown by XRD and TEM

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“…A direct observation of ferroelastic domains which disappears about 550 o C supports the ferroelasticity and the Amam symmetry of the intermediate phase [12]. Surprisingly, SrBi 2 Nb 2 O 9 shows a single crystallographic phase transition [13] which seem to exhibit a direct phase transition from the high-temperature tetragonal to a ferroelectric phase. However, due to the limitations of the powder method for diffraction analysis, which is the only method used up to now at high temperatures, it cannot be ruled out that intermediate phases indeed exist.…”

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confidence: 56%

Temperature-driven phase transitions in SrBi2Ta2O9 from first-principles calculations

Machado

Sepliarsky

Stachiotti

2008

Applied Physics Letters

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The phase transition sequence of SrBi 2 Ta 2 O 9 is investigated using a shell model with parameters fitted to first-principles calculations. We show that the complex interplay between polar and nonpolar instabilities leads to the presence of two phase transitions, corroborating the existence of an intermediate orthorhombic paraelectric phase. This phase is characterized by the rotation of the TaO 6 octahedra around the a-axis. We show that this phase can be also detected from the dielectric response of the material. The present approach constitutes a powerful tool for a theoretical prediction of intermediate phases, not yet observed experimentally, in other Aurivillius compounds.

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Ferroelectric phase transitions inSrBi2Nb2O9

Cited by 121 publications

References 11 publications

Unusual High‐Temperature Structural Behaviour in Ferroelectric Bi₂WO₆

Unusual High‐Temperature Structural Behaviour in Ferroelectric Bi₂WO₆

The structural and piezoresponse properties of c-axis-oriented Aurivillius phase Bi5Ti3FeO15 thin films deposited by atomic vapor deposition

Temperature-driven phase transitions in SrBi2Ta2O9 from first-principles calculations

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Ferroelectric phase transitions inSrBi2Nb2O9

Cited by 121 publications

References 11 publications

Unusual High‐Temperature Structural Behaviour in Ferroelectric Bi2WO6

Unusual High‐Temperature Structural Behaviour in Ferroelectric Bi2WO6

The structural and piezoresponse properties of c-axis-oriented Aurivillius phase Bi5Ti3FeO15 thin films deposited by atomic vapor deposition

Temperature-driven phase transitions in SrBi2Ta2O9 from first-principles calculations

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Unusual High‐Temperature Structural Behaviour in Ferroelectric Bi₂WO₆

Unusual High‐Temperature Structural Behaviour in Ferroelectric Bi₂WO₆