Effects of Co-substitutes on multiferroic properties of Bi5FeTi3O15 ceramics

Mao, Xu; Sun, Hui; Wang, Wei; Lu, Yalin; Chen, Xiaobing

doi:10.1016/j.ssc.2012.01.001

Cited by 67 publications

(34 citation statements)

References 28 publications

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“…4(a) shows the room-temperature polarization-electric field (P-E) hysteresis loops of the BTFO sample at different voltages with the frequency of 100 Hz. The P-E profiles are highly similar to those of BTFO ceramics reported by Mao et al, 36 and La and Co co-doped BTFO ceramics grown by Wang et al 37 The variations of the remanent polarization (P r ) and coercive field (E c ) with the applied fields for pure BTFO sample are plotted in inset of Fig. 4(a).…”

Section: Resultssupporting

confidence: 80%

“…Furthermore, platelike grains representing the characteristic of bismuth layer-structured Aurivillius phase are demonstrated in the enlarged FESEM images as indicated in insets of Fig. 3, similar to the parent BTFO 6 and Co-doped BTFO ceramics, 36 indicating that Cr-substitution cannot alter the layered microstructure shape. Compared to that of the Cr-free BTFO ceramic (one can see our earlier report in Ref.…”

Section: Resultsmentioning

confidence: 80%

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The Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics

Liu¹,

Bai²,

Yang³

et al. 2013

Journal of Applied Physics

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Aurivillius Bi5Ti3FeO15 (BTFO) multiferroic ceramics with different Cr-doped concentrations have been synthesized by the conventional solid state reaction method. The influences of Cr-doping concentrations on the structural, magnetic, dielectric, and ferroelectric properties of BTFO ceramics are investigated in detail. All these sintered Cr-substituted BTFO ceramics are determined to be layered perovskite Aurivillius structure by X-ray diffraction, as well as the lattice parameters a, b, and c are in good accordance with Vegard's law along with the Cr-doping concentration. The lattice distortion a/b for Aurivillius family decreases with increasing Cr-doping concentration. Moreover, Cr-doping can promote greatly the grain growth of BTFO samples confirmed from field emission scanning electron microscopy characterization. However, no obvious signs of the improvement in ferroelectric properties are found in Cr-doped BTFO ceramics, and abnormal ferroelectric polarization versus electric field (P-E) loops are observed as Cr-doping content is beyond 0.1. Similar ε (tanδ) versus frequency plots to those of the BTFO sample are exhibited when Cr-doping concentration is less than 0.1. Nevertheless, obvious dielectric dispersion phenomena are shown as the Cr-doping concentration is beyond 0.1, and this dispersion behavior becomes strong with further increasing Cr-doping concentration, which are clearly indicated by the appearance of dielectric loss relaxation peaks in the measurement frequency from 102 Hz to 106 Hz. In addition, the corresponding frequency to relaxation peak shifts towards high frequencies with the Cr-doping concentration. Finally, the same magnetic orderings for all these Cr-doped BTFO ceramics as those of the BTFO one, i.e., superparamagnetic state dominated with antiferromagnetic interaction, are unambiguously found, signifying that the predicted Fe3+-O-Cr3+ 180° ferromagnetic superexchange interaction based on the Goodenough-Kanamori (G-K) rule might not be achieved in BTFO ceramics through Cr substitution by the conventional solid state reaction.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 80%

The Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics

Liu¹,

Bai²,

Yang³

et al. 2013

Journal of Applied Physics

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“…The origin of 715 cm −1 mode should be correlated to the Bi-Fe-O perovskite block because this mode has not been found in some Bi-layered oxides without Fe element such as Bi 4 Ti 3 O 12 and CaBi 4 Ti 4 O 15 [26, 27]. Moreover, the mode at 321 cm −1 could correspond to ferroelectric phase transition as reported previously [28]. From the Raman measurement result, it is reasonable to conclude that BFTO single phase with four-layered perovskite structure has been successfully prepared.…”

Section: Resultsmentioning

confidence: 53%

Bi5FeTi3O15 nanofibers/graphene nanocomposites as an effective counter electrode for dye-sensitized solar cells

Zheng

Liang

et al. 2017

Nanoscale Res Lett

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The present study reports Bi5FeTi3O15 (BFTO) nanofibers/graphene (Gr) nanocomposites (BGr) as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). BFTO nanofibers with diameters of 40–100 nm were fabricated by sol-gel based electrospinning technique. The microstructure and surface morphology of the BFTO nanofibers and the BGr nanocomposites were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The electrochemical performances of BGr CEs were comprehensively characterized and investigated. Compared to pristine BFTO, the nanocomposites have a marked improvement in electrocatalytic performance for the reduction of triiodide because of larger surface area and lower transfer resistance on the electrolyte-electrode interface. The maximum power conversion efficiency has reached 9.56%, which is much larger than that of pure BFTO CEs (0.22%).

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“…The research has been focused on compositions with cobalt and iron, for which weak or strong ferromagnetic behavior above room temperature have been found. [80][81][82]. A common characteristic is that the ferroelectric saturation is hard to achieve.…”

Section: Multiferroismmentioning

confidence: 99%

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

Moure

2018

Applied Sciences

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According to the EU-Directives 2002/95/EC, 2002/96/EC, lead-based piezoceramics must be substituted in the future with more environmentally friendly alternatives, only when a reliable alternative is found. This is why an increasing interest has grown in the research community to find lead free piezoelectric materials that fulfil the requirements for this substitution. Different families of compounds have been shown to be possible candidates for this use, such as bismuth and niobates based perovskites, pyrochlores, etc. However, a material with piezoelectric coefficients similar to those of PZT (lead zirconate titanate, Pb[Zr x Ti 1-x ]O 3 ) has not been yet found. Besides, each of these families has its specific characteristics in terms of remnant polarization, coercive field or application temperature. Thus, the choice of each material should be made according to the specific needs of the application. In this sense, Aurivillius-type structure materials (also known as Bismuth Layered Structure Ferroelectrics, BLSF) can take advantage of their specific properties for uses as Lead Free Piezoelectric systems. Some of them have a high Curie temperature, which make them good candidates to be used as high temperature piezoelectrics; high coercive fields, which facilitates their use as actuators; or a high switching fatigue resistance, which can be useful for future applications as Ferroelectric Random Access Memories (FERAM).Keywords: bismuth layered ferroelectric structures; aurivillius; piezoelectric; multiferroic OverviewMany of the peculiar characteristic properties of Aurivillius materials are determined by their crystalline structure. Figure 1 shows the prototype of the Aurivillius structure as a function of the number of pseudo-perovskite layers [2]. The "n" values can range from 1 to ∞. In this case (n = ∞), the repeated cell is the pure perovskite. The number of perovskites can be odd, even or a mixture. Examples of each case are Bi 2 WO 6 (n = 1) and Bi 4 Ti 3 O 12 (n = 3); Bi 3 TiNbO 9 , SrBi 2 Nb 2 O 9 (n = 2) and CaBi 4 Ti 4 O 12 (n = 4); an example for a mixture Aurivillius is Bi 7 Ti 4 NbO 21 . In this case, layers with 2 or 3 pseudo-perovskites are alternated with the [Bi 2 O 2 ] 2+ layers.At difference of the ferroelectrics with perovskite structure, the polarization is not produced by the displacement of the B cation within the oxygen octahedral but by relative shifts of the oxygen octahedral through the a-axis with respect to the [001] bismuth chain. They can be divided in 3 main movements, as illustrated in references [3-5]:Oxygen octahedral in the a-axis. -Relative displacements in the opposite direction to B cations of the perovskite with respect to the octahedral. -Displacement through the a-axis of the oxygen ions of the Bi-O layer.

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Effects of Co-substitutes on multiferroic properties of Bi5FeTi3O15 ceramics

Cited by 67 publications

References 28 publications

The Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics

The Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics

Bi5FeTi3O15 nanofibers/graphene nanocomposites as an effective counter electrode for dye-sensitized solar cells

Review and Perspectives of Aurivillius Structures as a Lead-Free Piezoelectric System

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