Substitution-induced phase transition and enhanced multiferroic properties of Bi1−xLaxFeO3 ceramics

Zhang, Shan‐Tao; Zhang, Yi; Lu, Ming‐Hui; Du, Chunling; Chen, Yanfeng; Liu, Zhiguo; Zhu, Yuting; Ming, Nai‐Ben; Pan, Xiaoqing

doi:10.1063/1.2195927

Cited by 354 publications

(204 citation statements)

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“…13, a P s of 17 C/cm 2 was found in a quenched BFO ceramic tested under 155 kV/ cm and in Ref. 27, a P s of 20 C/cm 2 was obtained in La-doped BFO ceramics measured under 200 kV/ cm.͒ It is believed that the enhancement in the ferroelectric polarization of the doped ceramics is due to both lattice distortion and leakage current reduction. 7,12,13 Associated with the change of ferroelectric properties, the dielectric properties of the samples were also found to be dependent on the doping level.…”

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confidence: 99%

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Processing and properties of Yb-doped BiFeO3 ceramics

Yan

Wang

Qu³

et al. 2007

Applied Physics Letters

111

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The authors prepared Yb-doped bismuth iron oxide ceramics ͑Bi 1−x Yb x FeO 3 , with 0 ഛ x ഛ 0.20͒ by rapid liquid phase sintering method and investigated the material's structures and electrical properties. The x-ray diffraction measurements showed that the doping of Yb has induced noticeable lattice distortion in the ceramics, and a largest distortion was observed when the concentration of Yb was 15%. By doping electrical resistivity, ferroelectric and dielectric properties of the ceramics were improved. Among all samples, BiFeO 3 doped with 15% Yb was found to have the smallest leakage current density ͑Ͻ10 −7 A/cm 2 ͒ and the largest remnant polarization ͑8.5 C/cm 2 ͒. The compound BiFeO 3 ͑abbreviated as BFO͒ was first synthesized in the late 1950s. 1 Research in the early stage, which mainly focused on ceramics, revealed that BFO possesses a rhombohedrally distorted perovskite structure ͑lat-tice parameters a = b = c = 0.563 nm and ␣ = ␤ = ␥ = 59.4°͒ in addition to coupled ferroelectric ͑Curie temperature T C ϳ 1103 K͒ and antiferromagnetic ͑Neel temperature T N ϳ 643 K͒ behaviors at room temperature. Despite a high Curie temperature, the bulk BFO exhibits very weak ferroelectric behavior ͑e.g., the spontaneous polarization P s , is only ϳ3.5 C/cm 2 ͒. 2-5 BFO thin films have been studied since the late 1980s. 6 In 2003, Wang et al. reported that a very large ferroelectric polarization ͑remnant polarization P r ϳ 60 C/cm 2 ͒ has been achieved in a BFO thin film epitaxially grown on SrRuO 3 / SrTiO 3 . 7 The significantly enhanced polarization was interpreted as the result of a compressive stress imposed by the SrRuO 3 electrode, which has an in-plane lattice parameter smaller than that of BFO. Because of the compressive stress, the epitaxial BFO film has a tetragonal-like crystal structure ͑a = 0.394 nm, c = 0.400 nm, and ␣ = 89.5°͒ rather than the rhombohedral symmetry in bulk materials and therefore leads to large polarization. Since then more studies have reported with successful development of BFO thin films with polarizations ranging from 50 to 150 m/cm 2 . 2,8-10 Theoretical work has also been conducted to interpret the extraordinarily large ferroelectric polarization in BFO films. 11 The success in the thin film studies has in turn stimulated interest to produce bulk ceramics with improved properties. New processing techniques, such as rapid liquid phase sintering, have been developed to synthesize single-phase BFO ceramics. 12,13 The effect of compositional modification, either by forming of solid solution ͑e.g., with Pb͑Zr 1−x ,Ti x ͒O 3 ͒ 14 or by doping, has also been extensively studied. Quite a number of transition metal elements ͑e.g., Ni, Ti, Cr, and Mn͒ 15-18 and rare-earth elements ͑e.g., La and Nd͒ 19,20 have been employed as dopants. The authors are more interested in the doping of rare-earth elements because this may significantly change both the ferroelectric properties and magnetic behaviors of BFO which could possibly lead to enhanced magnetoelectric effect. 21,22 In this work, we repo...

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confidence: 99%

“…These results are comparable to the enhanced polarizations of modified BFO bulk ceramics reported in the literature. 12,13,20,27 ͑For example, in Ref. 13, a P s of 17 C/cm 2 was found in a quenched BFO ceramic tested under 155 kV/ cm and in Ref.…”

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confidence: 99%

Processing and properties of Yb-doped BiFeO3 ceramics

Yan

Wang

Qu³

et al. 2007

Applied Physics Letters

111

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“…Besides this, a structural phase evolution along with improved ferroelectric and ferromagnetic properties is noticed. Recently, the rare earth (La) doped BiFeO 3 as Bi 0.7 La 0.3 FeO 3 witnesses a structural phase transition (rhombohedralorthorhombic) with enhanced magnetoelectric interaction [11]. The rare earth (Nd) doped BFO as Bi 1x Nd x FeO 3 (x = 0.05-0.15) also documents structural evolution but from rhombohedral to triclinic structure.…”

Section: Introductionmentioning

confidence: 99%

Rare earth (La) and metal ion (Pb) substitution induced structural and multiferroic properties of bismuth ferrite

2015

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Abstract:In this study, bulk samples of multiferroic with compositional formula, BiFeO 3 and Bi 0.825 A 0.175 FeO 3 (A = La, Pb), were synthesized by solid state reaction route. X-ray diffraction (XRD) along with the Rietveld refinement revealed the distorted rhombohedral (R3c) structure for pristine BiFeO 3 and Bi 0.825 La 0.175 FeO 3 and tetragonal (P4/mmm) for Bi 0.825 Pb 0.175 FeO 3 ceramic. To support the structural results, bond length between atoms for both of the compounds was calculated. A change in Raman mode position in BiFeO 3 (BFO) has been observed with La and Pb substitution from Raman scattering measurements and also recommended a structural change with rare earth and metal ion substitution at Bi site. From the frequency dependent dielectric constant and dielectric loss plots, a decrease in dielectric values with increase in frequency was observed for both of the samples. For microelectronic devices, porous ceramics with lower value of dielectric constant are most useful. Thus, further studies are also needed to carefully tune the magnetoelectric properties and structural distortion after La/Pb substitution in BFO.

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“…15 A similar transition, albeit more complicated, is reported in the intensely studied Bi 1−x La x FeO 3 series. 5,[16][17][18][19] Here the similar ionic radii between Bi and La makes it possible to stabilize several intermediate structures before the final P nma structure is reached at 50% La content. 16 XRD and electron diffraction (ED) data indicated a stabilized R3c structure up to 20% La content where a transition towards a P nma structure of the GdFeO 3 type occurred.…”

Section: Introductionmentioning

confidence: 99%

“…This has the possibility to induce an increase in both the compositional stability as well as reducing the relatively large leakage current in BiFeO 3 . 5,6 In addition, isovalent substitution can destroy the spin cycloid that prohibits a macroscopic first-order magnetoelectric coupling. 7 The parent compound BiFeO 3 crystallizes in a perovskite R3c structure that differs from the ideal cubic structure by a translational offset along [111] of the Bi cation and an antiphase tilt of the oxygen octahedra along all three directions (a − a − a − in Glazer notation 8 ).…”

Section: Introductionmentioning

confidence: 99%