Evolution of structure and ferroelectricity in Aurivillius Bi4Bin−3Fen−3Ti3O3n+3 thin films

Song, Dongpo; Yang, Jie; Yang, Bingbing; Chen, Liang Yu; Wang, Fang; Zhu, Xuebin

doi:10.1039/c8tc02270d

Cited by 41 publications

(11 citation statements)

References 53 publications

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“…Particularly, Bi 5 Ti 3 FeO 15 (BTF, with n = 1), a member of the BLSF (BiFeO 3 ) n ‐Bi 4 Ti 3 O 12 family, has recently attracted considerable attention as a typical multiferroic oxide. Structurally, BTF exhibits the polar orthorhombic space group A 2 1 am , containing four perovskite‐like B O 6 ( m = 4, B = Ti or Fe) octahedra units stacked alternately with (Bi 2 O 2 ) 2+ layers along the c axis . Over the past decade, the electrical, multiferroic, and magnetoelectric properties of BTF‐based oxides have been extensively investigated .…”

Section: Introductionmentioning

confidence: 99%

Enhanced piezoelectric properties of Mn‐modified Bi₅Ti₃FeO₁₅ for high‐temperature applications

Wang

2020

J Am Ceram Soc

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Bi5Ti3FeO15 (BTF) has recently attracted considerable interest as a typical multiferroic oxide, wherein ferroelectric and magnetic orders coexist. The ferroelectric order of BTF implies its piezoelectricity, because a ferroelectric must be a piezoelectric. However, no extensive studies have been carried out on the piezoelectric properties of BTF. Considering its high ferroelectric‐paraelectric phase transition temperature (Tc ~ 761°C), it is necessary to analyze the piezoelectricity and thermal stabilities of BTF, a promising high‐temperature piezoelectric material. In this study, lightly manganese‐modified BTF polycrystalline oxides are fabricated by substituting manganese ions into Fe3+ sites via the conventional solid‐state reaction method. X‐ray diffraction and Raman spectroscopy analyses reveal that the resultant manganese‐modified BTF has an Aurivillius‐type structure with m = 4, and that the substitutions of Fe by Mn lead to a distortion of BO6. The temperature‐dependent dielectric properties and direct‐current (DC) resistivity measurements indicate that the Mn ions can significantly reduce the dielectric loss tanδ and increase the DC resistivity. The piezoelectricity of BTF is confirmed by piezoelectric constant d33 measurements; it exhibits a piezoelectric constant d33 of 7 pC/N. Remarkably, BTF with 4 mol% of Mn (BTF‐4Mn) exhibits a large d33 of 23 pC/N, three times that of unmodified BTF, whereas the Curie temperature Tc is almost unchanged, ~765°C. The increased piezoelectric performance can be attributed to the crystal lattice distortion, decreased dielectric loss tanδ, and increased DC resistivity. Additionally, BTF‐4Mn exhibits good thermal stabilities of the electromechanical coupling characteristics, which demonstrates that manganese‐modified BTF oxides are promising materials for the use in high‐temperature piezoelectric sensors.

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Section: Introductionmentioning

confidence: 99%

Enhanced piezoelectric properties of Mn‐modified Bi₅Ti₃FeO₁₅ for high‐temperature applications

Wang

2020

J Am Ceram Soc

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“…PFM results from other AP materials show that charged domain walls are evident in as-grown films [3], so the FE results from STEM HAADF presented here appear to be representative. The conduction mechanisms in similar AP films vary depending on the strength of the applied field but both ionic conductivity and electron hopping conductivity have an important contribution according to Song et al [57].…”

Section: Resultsmentioning

confidence: 99%

Polar Vortexes and Charged Domain Walls in a Room Temperature Magnetoelectric Thin Film

Moore¹,

O’Connell²,

Keeney³

et al. 2020

Preprint

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Multiferroic domain walls are an emerging solution for future low-power nanoelectronics due to their combined tuneable functionality and mobility. Here we show that the magnetoelectric multiferroic Aurivillius phase Bi6TixFeyMnzO18 (B6TFMO) crystal is an ideal platform for domain wall-based nanoelectronic devices. The unit cell of B6TFMO is distinctive as it consists of a multiferroic layer between dielectric layers. We utilise atomic resolution scanning transmission electron microscopy and spectroscopy to map the sub-unit-cell polarisation in B6TFMO thin films. 180˚ charged head-to-head and tail-to-tail domain walls are found to pass through > 8 ferroelectric-dielectric layers of the film. They are structurally similar to BiFeO3 DWs but contain a large surface charge density (σ_s) = 1.09 |e|per perovskite cell, where |e| is elementary charge. Although polarisation is primarily in-plane, c-axis polarisation is identified at head-to-tail domain walls with an associated electromechanical coupling of strain and polarisation. Finally, we reveal that with controlled strain engineering during thin film growth, room-temperature vortexes are formed in the ferroelectric layer. These results confirm that sub-unit-cell topological features can play an important role in controlling the conduction properties and magnetisation state of Aurivillius phase films and other multiferroic heterostructures.

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“…The melted particles (or the melted part in the partially melted particles) produce the amorphous phase in the as-sprayed NiCrBSi coatings [1]. In metallic materials, heat treatment can provide the activation energy required to induce the crystallization of amorphous phases, leading to nucleation and growth of new crystalline phase grains [64][65][66][67]. Hence, the heat-treated NiCrBSi coating is strengthened by the precipitates of hard phases (e.g., Ni 3 B) and uniformly distributed nanocrystals embedded in the amorphous phase [1].…”

Section: Electrochemical Resultsmentioning

confidence: 99%

Particle Size-Dependent Microstructure, Hardness and Electrochemical Corrosion Behavior of Atmospheric Plasma Sprayed NiCrBSi Coatings

Sang

Chen

Zhao

et al. 2019

Metals

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Particle size is a critical consideration for many powder coating-related industries since it significantly influences the properties of the produced materials. However, the effect of particle size on the characteristics of plasma sprayed NiCrBSi coatings is not well understood. This work investigates the microstructures, hardness and electrochemical corrosion behavior of plasma sprayed NiCrBSi coatings synthesized using different-sized powders. All coatings mainly consist of Ni, N 3 B, CrB, Cr 7 C 3 and Cr 3 C 2 phases. The coatings produced by small particles (50-75 µm) exhibit lower porosity (2.0 ± 0.8%). Such coatings show a higher fraction (15.5 vol.%) of the amorphous phase and lower hardness (700 HV 0.5 ) than the counterparts (8.7 vol.% and 760 HV 0.5 , respectively) produced by large particles (75-100 µm) with higher porosity (3.0 ± 1.6%). Meanwhile, the coatings produced from smaller particles possess a larger number of non-bonded boundaries, leading to the easier penetration of corrosive medium, as well as a higher corrosion current density (0.254 ± 0.062 µA/cm 2 ) and a lower charge transfer resistance (0.37 ± 0.07 MΩ cm 2 ). These distinctions are attributed to particle size-induced different melting degrees and stackings of in-flight particles during deposition. studied the effects of particle size and structure on the preferential Ce evaporation for La 2 Ce 2 O 7 particles during plasma spraying and indicated that the evaporation loss of Ce is significantly influenced by particle size, thereby affecting the properties of the as-sprayed La 2 Ce 2 O 7 coatings. Sun et al. [16] used different-sized WC powders to sinter three sets of WC-8Co cemented carbides and found that the transgranular fractures of the prepared cemented carbides are more evident with increasing WC particle size. From all this one can conclude that powder appearance potentially influences the properties and therefore the end applications of the produced products.NiCrBSi alloy coatings are also commonly prepared by metallic powder-related techniques including spraying [17,18] and laser cladding [19,20], with the aim to produce barriers to protect substrates from wear and/or corrosion. Amongst these techniques, atmospheric plasma spraying (APS) is frequently used due to its high synthesis speed and few limitations on equipment [21]. APS adopts a plasma gun as a heat source to melt the feedstock powder sprayed from the nozzle and impinges these powder particles on the substrates in a layer by layer method [22]. As a result, this processing method results in a typical lamellar microstructure in APS-prepared NiCrBSi coatings associated with a large number of pores and non-bonded boundaries (including lamellar boundaries and particle boundaries). Pores generally decrease the cohesion of the as-sprayed NiCrBSi coatings, thereby reducing their hardness and wear resistance [22]. In the meantime, non-bonded boundaries in as-sprayed NiCrBSi coatings provide diffusion paths for the ingress of corrosive species in a corrosive environment [22]. ...

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Evolution of structure and ferroelectricity in Aurivillius Bi₄Bi_n−3Fe_n−3Ti₃O_3n+3 thin films

Abstract: The optimized ferroelectric properties in Aurivillius films with higher n are well suited to ferroelectric-based data storage and for further exploration of single-phase multiferroics.

Cited by 41 publications

References 53 publications

Enhanced piezoelectric properties of Mn‐modified Bi₅Ti₃FeO₁₅ for high‐temperature applications

Enhanced piezoelectric properties of Mn‐modified Bi₅Ti₃FeO₁₅ for high‐temperature applications

Polar Vortexes and Charged Domain Walls in a Room Temperature Magnetoelectric Thin Film

Particle Size-Dependent Microstructure, Hardness and Electrochemical Corrosion Behavior of Atmospheric Plasma Sprayed NiCrBSi Coatings

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Evolution of structure and ferroelectricity in Aurivillius Bi4Bin−3Fen−3Ti3O3n+3 thin films

Abstract: The optimized ferroelectric properties in Aurivillius films with higher n are well suited to ferroelectric-based data storage and for further exploration of single-phase multiferroics.

Cited by 41 publications

References 53 publications

Enhanced piezoelectric properties of Mn‐modified Bi5Ti3FeO15 for high‐temperature applications

Enhanced piezoelectric properties of Mn‐modified Bi5Ti3FeO15 for high‐temperature applications

Polar Vortexes and Charged Domain Walls in a Room Temperature Magnetoelectric Thin Film

Particle Size-Dependent Microstructure, Hardness and Electrochemical Corrosion Behavior of Atmospheric Plasma Sprayed NiCrBSi Coatings

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Evolution of structure and ferroelectricity in Aurivillius Bi₄Bi_n−3Fe_n−3Ti₃O_3n+3 thin films

Enhanced piezoelectric properties of Mn‐modified Bi₅Ti₃FeO₁₅ for high‐temperature applications

Enhanced piezoelectric properties of Mn‐modified Bi₅Ti₃FeO₁₅ for high‐temperature applications