Greatly reduced leakage current and conduction mechanism in aliovalent-ion-doped BiFeO3

Qi, Xiaoding; Dho, Joonghoe; Tomov, Rumen I.; Blamire, M. G.; MacManus‐Driscoll, Judith L.

doi:10.1063/1.1862336

Cited by 997 publications

(581 citation statements)

References 10 publications

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“…To overcome this problem, various approaches have been proposed, such as reduction in oxygen vacancies, domination of the ohmic conduction, and intergrain depletion in grain boundary limited conduction. The efforts have been made to reduce the leakage current density by either introducing dopants or using different fabrication methods [12][13][14][15][16]. At present, many researchers are engaged in the enrichment of multiferroic properties of BiFeO 3 -relevant materials, using different trivalent dopants such as La [17], Mn [18], Sm [19] and Ti [20].…”

Section: Introductionmentioning

confidence: 99%

Structural, magnetic and dielectric properties of nano-crystalline Ni-doped BiFeO3 ceramics formulated by self-propagating high-temperature synthesis

Chaudhari

Mahajan²,

Jagtap

et al. 2013

J Adv Ceram

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Ni-doped BiFeO 3 powders with the composition BiFe 1x Ni x O 3 (x = 0.05, 0.1 and 0.15) were prepared by a self-propagating high-temperature synthesis (SHS), using metal nitrates as oxidizers and glycine as fuel. The X-ray diffraction (XRD) patterns depict that Ni-doped BiFeO 3 ceramics crystallize in a rhombhohedral phase. The scanning electron micrographs of Ni-doped BiFeO 3 ceramics show a dense morphology with interconnected structure. It is found that, the room-temperature magnetization measurements in Ni-incorporated

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Section: Introductionmentioning

confidence: 99%

Structural, magnetic and dielectric properties of nano-crystalline Ni-doped BiFeO3 ceramics formulated by self-propagating high-temperature synthesis

Chaudhari

Mahajan²,

Jagtap

et al. 2013

J Adv Ceram

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“…In undoped BFO, the oxygen vacancies rather than Fe 2+ ions are the main cause of high conductivity and the likely trap center is the oxygen vacancy. 15 Therefore, the Yb-doping effect on the electrical conductivity in our samples is very likely a result of changes of oxygen vacancy concentration. To better understand the conduction mechanism, we have assessed the samples' electrical conductivity at elevated temperatures.…”

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confidence: 99%

“…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][16][17][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.…”

mentioning

confidence: 99%

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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“…with several reports claiming tetragonal [6,28], rhombohedral [29,30], and monoclinic [31,32] structure, and its phonons. Of particular interest regarding phononmagnon coupling in BFO was the report [24] large (40 cm −1 ) change in the frequency of one long wavelength phonon branch near T N .…”

Section: B Phonon Anomalies Near Tnmentioning

confidence: 99%

Phonon spectroscopy near phase transition temperatures in multiferroicBiFeO3epitaxial thin films

2010

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We report a Raman scattering investigation of multiferroic bismuth ferrite (BiFeO3) epitaxial (c-axis oriented) thin films from -192 to 1000 • C. Phonon anomalies have been observed in three temperature regions: in the γ-phase from 930 • C to 950 • C; at ∼ 370 • C, Néel temperature (TN), and at ∼ -123 • C, due to a phase transition of unknown type (magnetic or structural). An attempt has been made to understand the origin of the weak phonon-magnon coupling and the dynamics of the phase sequence. The disappearance of several Raman modes at ∼ 820 • C (Tc) is compatible with the known structural phase transition and the Pbnm orthoferrite space group assigned by Arnold et al. [1]. The spectra also revealed a non-cubic β-phase from 820-930 • C and the same non-cubic phase extends through the γ-phase between 930-950 • C, in agreement with Arnold et al. [2], and an evidence of a cubic δ-phase around 1000 • C in thin films that is not stable in powder and bulk. Such a cubic phase has been theoretically predicted in [3]. Micro-Raman scattering and X-ray diffraction showed no structural decomposition in thin films during the thermal cycling from 22-1000 • C.

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Greatly reduced leakage current and conduction mechanism in aliovalent-ion-doped BiFeO3

Cited by 997 publications

References 10 publications

Structural, magnetic and dielectric properties of nano-crystalline Ni-doped BiFeO3 ceramics formulated by self-propagating high-temperature synthesis

Structural, magnetic and dielectric properties of nano-crystalline Ni-doped BiFeO3 ceramics formulated by self-propagating high-temperature synthesis

Processing and properties of Yb-doped BiFeO3 ceramics

Phonon spectroscopy near phase transition temperatures in multiferroicBiFeO3epitaxial thin films

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