Ferroelectric BiFeO3 X-ray and neutron diffraction study

Moreau, Jean-Michel; Michel, C.; Gerson, Robert; James, William Joseph

doi:10.1016/s0022-3697(71)80189-0

Cited by 501 publications

(299 citation statements)

References 8 publications

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“…1(a)) follow the same trends observed by previous authors. 12,13,16 The oxygen octahedral rotation, ω, and the 'polar' shifts of the Bi 3+ (tc) and Fe 3+ (sc) ions from their 'ideal' positions (c is the lattice parameter; t and s parameters are defined by Megaw et al 26 and Moreau et al 27 and summarised by Fischer et al 11 ) are plotted in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric-Paraelectric Transition inBiFeO3: Crystal Structure of the OrthorhombicβPhase

et al. 2009

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Section: Introductionmentioning

confidence: 99%

Ferroelectric-Paraelectric Transition inBiFeO3: Crystal Structure of the OrthorhombicβPhase

et al. 2009

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“…[1][2][3] Owing to its rhombohedral structure, the ferrite has been considered as an end-member of a variety of leadfree solid solutions exhibiting morphotropic phase boundary (MPB), which is believed to be the key for obtaining high piezoelectric properties. Some recently studied systems are BiFeO 3 -REFeO 3 (RE = La, Nd, Sm, Gd, Dy), [4][5][6] BiFeO 3 -BaTiO 3 , 7,8 and BiFeO 3 -Bi(Zn 0.5 Ti 0.5 )O 3 .…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric nonlinearity and frequency dispersion of the direct piezoelectric response of BiFeO3 ceramics

Rojac¹,

Benčan²,

Dražić³

et al. 2012

Journal of Applied Physics

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We report on the frequency and stress dependence of the direct piezoelectric d 33 coefficient in BiFeO 3 ceramics. The measurements reveal considerable piezoelectric nonlinearity, i.e., dependence of d 33 on the amplitude of the dynamic stress. The nonlinear response suggests a large irreversible contribution of non-180° domain walls to the piezoelectric response of the ferrite, which, at present measurement conditions, reached a maximum of 38% of the total measured d 33 . In agreement with this interpretation, both types of non-180° domain walls, characteristic for the rhombohedral BiFeO 3 , i.e., 71° and 109°, were identified in the poled ceramics using transmission electron microscopy (TEM). In support to the link between nonlinearity and non-180° domain wall contribution, we found a correlation between nonlinearity and processes leading to deppining of domain walls from defects, such as quenching from above the Curie temperature and high-temperature sintering. In addition, the nonlinear piezoelectric response of BiFeO 3 showed a frequency dependence that is 2 qualitatively different from that measured in other nonlinear ferroelectric ceramics, such as "soft" (donor-doped) Pb(Zr,Ti)O 3 (PZT), i.e., in the case of the BiFeO 3 large nonlinearities were observed only at low field frequencies (<0.1 Hz); possible origins of this dispersion are discussed. Finally, we show that, once released from pinning centers, the domain walls can contribute extensively to the electromechanical response of BiFeO 3 ; in fact, the extrinsic domain-wall contribution is relatively as large as in Pb-based ferroelectric ceramics with morphotropic phase boundary (MPB) composition, such as PZT. This finding might be important in the search of new lead-free MPB compositions based on BiFeO 3 as it suggests that such compositions might also exhibit large extrinsic domain-wall contribution to the piezoelectric response. a) Electronic mail: tadej.rojac@ijs.si 3

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“…6,7 Powder x-ray diffraction ͑XRD͒ and neutron diffraction studies revealed that BFO has a rhombohedrally distorted perovskite structure. 8,9 However, several serious drawbacks of BFO associated with its electrical properties, such as high leakage current, 10 small ferroelectric spontaneous polarization, 11 and weak magnetization, 12 hinder its potential applications in the near future.…”

Section: Introductionmentioning

confidence: 99%

Preparation of La-doped BiFeO3 thin films with Fe2+ ions on Si substrates

Gao

Cai

Wang

et al. 2006

Journal of Applied Physics

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La-doped BiFeO 3 thin films with Fe 2+ ions have been prepared on Pt/ TiO 2 / SiO 2 / Si substrates by pulsed laser deposition in order to enhance the ferroelectric and magnetic properties. The targets for the film deposition were synthesized using a rapid liquid phase sintering technique to ensure the low leakage. The dielectric properties at room temperature and above were investigated. It was observed that the La doping greatly enhances the ferroelectric polarization at room temperature by modifying the film structure from rhombohedral to monoclinic. The saturation magnetization was enhanced about two times due to the Fe 2+ ions in the thin films.

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Ferroelectric BiFeO3 X-ray and neutron diffraction study

Cited by 501 publications

References 8 publications

Ferroelectric-Paraelectric Transition inBiFeO3: Crystal Structure of the OrthorhombicβPhase

Ferroelectric-Paraelectric Transition inBiFeO3: Crystal Structure of the OrthorhombicβPhase

Piezoelectric nonlinearity and frequency dispersion of the direct piezoelectric response of BiFeO3 ceramics

Preparation of La-doped BiFeO3 thin films with Fe2+ ions on Si substrates

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