Critical roles of Mn-ions in enhancing the insulation, piezoelectricity and multiferroicity of BiFeO<sub>3</sub>-based lead-free high temperature ceramics

Guo, Yongquan; Xiao, Ping; Wen, Rui; Wan, Yang; Zheng, Qiaoji; Shi, Dongliang; Lam, Kwok Ho; Liu, Milan; Lin, Dunmin

doi:10.1039/c5tc00507h

Cited by 147 publications

(82 citation statements)

References 67 publications

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“…The corresponding reaction is written asHence a straightforward way to reduce the leakage current is to inhibit the Fe 3+ -to-Fe 2+ transition, which has been proved effective in BFO-based ceramics with partially substitution of analogous ions (such as Ti, Mn, Co, and Al etc.) at Fe sites 49,52 or BFO-ABO 3 (such as PbTiO 3 and BTO) solid solutions 53,54 . In the BFSTO system, we reveal that the Fe 3+ -to-Fe 2+ transition is also suppressed by the incorporation of STO.…”

Section: Resultsmentioning

confidence: 99%

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

et al. 2018

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Developing high-performance film dielectrics for capacitive energy storage has been a great challenge for modern electrical devices. Despite good results obtained in lead titanate-based dielectrics, lead-free alternatives are strongly desirable due to environmental concerns. Here we demonstrate that giant energy densities of ~70 J cm−3, together with high efficiency as well as excellent cycling and thermal stability, can be achieved in lead-free bismuth ferrite-strontium titanate solid-solution films through domain engineering. It is revealed that the incorporation of strontium titanate transforms the ferroelectric micro-domains of bismuth ferrite into highly-dynamic polar nano-regions, resulting in a ferroelectric to relaxor-ferroelectric transition with concurrently improved energy density and efficiency. Additionally, the introduction of strontium titanate greatly improves the electrical insulation and breakdown strength of the films by suppressing the formation of oxygen vacancies. This work opens up a feasible and propagable route, i.e., domain engineering, to systematically develop new lead-free dielectrics for energy storage.

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Section: Resultsmentioning

confidence: 99%

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

et al. 2018

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“…46,47 From Figure 3, pure KNN ceramic gives two broad current peaks due to twice rotations of polarization (i.e., twice rotations aligning along field direction). 46,47 From Figure 3, pure KNN ceramic gives two broad current peaks due to twice rotations of polarization (i.e., twice rotations aligning along field direction).…”

Section: Resultsmentioning

confidence: 99%

Defect‐driven evolution of piezoelectric and ferroelectric properties in CuSb₂O₆‐doped K_0.5Na_0.5NbO₃ lead‐free ceramics

Wang

Deng

et al. 2017

J Am Ceram Soc

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Defect greatly affects the microscopic structure and electrical properties of perovskite piezoelectric ceramics, but the microscopic mechanism of defect-driven macroscopic properties in the materials is not still completely comprehended. In this work, K 0.5 Na 0.5 NbO 3 +x mol CuSb 2 O 6 lead-free piezoelectric ceramics were fabricated by a solid-state reaction method and the defect-driven evolution of piezoelectric and ferroelectric properties was studied. The addition of CuSb 2 O 6 induces the formation of dimeric ðCu 000At low doping concentration of CuSb 2 O 6 (0.5-1.0 mol%), DC1 and DC2 coexist in the ceramics and harden the ceramics, inducing a constricted double P-E loop and high Q m of 895 at x=0.01. However, DC2 becomes more dominant in the ceramics with high concentration of CuSb 2 O 6 (≥1.5 mol%) and thus leads to softening behavior of piezoelectricity and ferroelectricity as compared to the ceramic with x=0.01, giving a single slanted P-E loop and relatively low Q m of 206 at x=0.025. All ceramics exhibit relatively high d 33 of 106-126 pC/ N. Our study shows that the piezoelectricity and ferroelectricity of K 0.5 Na 0.5 NbO 3 ceramics can be tailored by controlling defect structure of the materials. K E Y W O R D Sdefects, ferroelectricity/ferroelectric materials, lead-free ceramics, perovskites, piezoelectric materials/ properties

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“…10 Previous investigations have shown that doping with rare-earth, alkaline-earth and transition elements modify spiral spin structure and also reduce leakage current which results in improved magnetic as well as ferroelectric properties. 8,14,15 Besides, recent investigations have demonstrated enhanced magnetization in BFO nanostructures with sizes less than 62 nm by virtue of its modified spiral spin structure. [11][12][13] The effect of doping concentration on multiferroic properties of both bulk and nanocrystalline Ba-doped BFO ceramic materials were reported in Refs.…”

Section: -2mentioning

confidence: 99%

“…2(a) is approximately 5.35 eV which suggests the existence of stable Bi 3+ ion in the doped and undoped BFO ceramics. 15 The XPS spectra of Fe 2p shown in Fig. 2 (104) and (110) in Fig.…”

Section: A Structural Characterizationmentioning

confidence: 99%

“…15 To examine the evidence of multiple valence states of Fe and concentration of oxygen vacancies, XPS analysis has been performed for BFO powders annealed at 600 o C and BBFO powders annealed at 400 o C and 600 o C. The core level binding energy spectra of Bi 4f, Fe 2p, O 1s and Ba 3d orbitals are shown in figures 2(a)-2(d) respectively. The distance between two peaks corresponding to the Bi 4f 5/2 and Bi 4f 7/2 shown in Fig.…”

Section: A Structural Characterizationmentioning

confidence: 99%

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Size dependent magnetic and electrical properties of Ba-doped nanocrystalline BiFeO3

et al. 2016

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Improvement in magnetic and electrical properties of multiferroic BiFeO3 in conjunction with their dependence on particle size is crucial due to its potential applications in multifunctional miniaturized devices. In this investigation, we report a study on particle size dependent structural, magnetic and electrical properties of sol-gel derived Bi0.9Ba0.1FeO3 nanoparticles of different sizes ranging from ∼ 12 to 49 nm. The substitution of Bi by Ba significantly suppresses oxygen vacancies, reduces leakage current density and Fe 2+ state. An improvement in both magnetic and electrical properties is observed for 10 % Ba-doped BiFeO3 nanoparticles compared to its undoped counterpart. The saturation magnetization of Bi0.9Ba0.1FeO3 nanoparticles increase with reducing particle size in contrast with a decreasing trend of ferroelectric polarization. Moreover, a first order metamagnetic transition is noticed for ∼ 49 nm Bi0.9Ba0.1FeO3 nanoparticles which disappeared with decreasing particle size. The observed strong size dependent multiferroic properties are attributed to the complex interaction between vacancy induced crystallographic defects, multiple valence states of Fe, uncompensated surface spins, crystallographic distortion and suppression of spiral spin cycloid of BiFeO3.

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Critical roles of Mn-ions in enhancing the insulation, piezoelectricity and multiferroicity of BiFeO₃-based lead-free high temperature ceramics

Abstract: A lead-free multiferroic ceramic of BiFe0.96Sc0.04O3–BaTiO3 is a type of ABO3 perovskite structure, belonging to the R3c space group, but exhibiting poor insulation and weak multiferroicity.

Cited by 147 publications

References 67 publications

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

Defect‐driven evolution of piezoelectric and ferroelectric properties in CuSb₂O₆‐doped K_0.5Na_0.5NbO₃ lead‐free ceramics

Size dependent magnetic and electrical properties of Ba-doped nanocrystalline BiFeO3

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Critical roles of Mn-ions in enhancing the insulation, piezoelectricity and multiferroicity of BiFeO3-based lead-free high temperature ceramics

Abstract: A lead-free multiferroic ceramic of BiFe0.96Sc0.04O3–BaTiO3 is a type of ABO3 perovskite structure, belonging to the R3c space group, but exhibiting poor insulation and weak multiferroicity.

Cited by 147 publications

References 67 publications

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

Defect‐driven evolution of piezoelectric and ferroelectric properties in CuSb2O6‐doped K0.5Na0.5NbO3 lead‐free ceramics

Size dependent magnetic and electrical properties of Ba-doped nanocrystalline BiFeO3

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Critical roles of Mn-ions in enhancing the insulation, piezoelectricity and multiferroicity of BiFeO₃-based lead-free high temperature ceramics

Defect‐driven evolution of piezoelectric and ferroelectric properties in CuSb₂O₆‐doped K_0.5Na_0.5NbO₃ lead‐free ceramics