Aurivillius Phases Bim + 1Fem – 3Ti3O3m + 3: Synthesis, Structure, and Properties (a Review)

Ломанова, Н. А.

doi:10.1134/s0036023622060146

Cited by 21 publications

(12 citation statements)

References 85 publications

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“…A detailed Rietveld analysis is made on these samples and the parameters were given in Figure 1. The Bragg peaks were fitted very well with the expected error with varying the size of rare earth ions [27,28]. The variation of lattice parameters and volume fraction of 3-and 4-layered phases with rare earth size is shown in Figure 2a-c.…”

Section: Powder X-ray Diffraction and Morphological Studiesmentioning

confidence: 58%

“…The radius of Co 2+ (0.745 Å) is larger when compared to Fe 2+ (0.605 Å). The Co 2+ substitution for Ti-ion creates oxygen vacancies [8,27]. From this one can speculate Ti 3+ -O-Ti 4+ decreases the bond angle and finally weakens the magnetic exchange interaction.…”

Section: Magnetic Studiesmentioning

confidence: 91%

“…They found that the Co-ion substitution in the phase of Fe (for B-site) has shown higher ferromagnetic and magnetoelectric properties [8]. In view of this, many researchers [21][22][23][24][25][26][27][28][29][30][31] are preparing Co/Fe-modified (at B-site) compounds, and therefore intergrowth route is considered to be an effective way to improve ferroic properties, especially in Aurivillius materials.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and Magnetoelectric Properties of AurivilliusThree- and Four-Layered Intergrowth Ceramics

et al. 2023

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In this work, we have prepared intergrowth of multiferroic compounds namely Bi4RTi3Fe0.7Co0.3O15-Bi3RTi2Fe0.7Co0.3O12−δ (BRTFCO15-BRTFCO12) (rare earth (R) = Dy, Sm, La) by solid-state reaction method. From the X-ray diffraction Rietveld refinement, the structure of the intergrowths was found to be orthorhombic in which satisfactory fittings establish the existence of three-layered (space group: b 2 c b) and four-layered compounds (space group: A21am). Analysis of magnetic measurements confirmed a larger magnetization for theSm-modified intergrowth compound (BSTFCO15-BSTFCO12) compared to Dy- and La-doped ones. The emergence of higher magnetic properties can be due to distortion in the unit cell when some Bi3+ ions are replaced with the Sm3+, bonding of Fe3+-O-Co3+ as well as a possible mixture of FexCoy-type nanoparticles that are formed generally in the synthesis of intergrowths. The changes in the magnetic state of the Aurivillius intergrowths have been reflected in the magnetoelectric (ME) coupling: higher ME coefficient (~30 mV/Cm-Oe) at lower magnetic fields and is constant up to 3 kOe. The results were corroborated by Raman spectroscopy and variation of temperature with magnetization data. The results revealed that the RE-modified intergrowth route is an effective preparative method for higher-layer Aurivillius multiferroic ceramics.

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Section: Powder X-ray Diffraction and Morphological Studiesmentioning

confidence: 58%

Section: Magnetic Studiesmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Magnetic and Magnetoelectric Properties of AurivilliusThree- and Four-Layered Intergrowth Ceramics

et al. 2023

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“…Thermal treatment leads to a solid-phase chemical reaction in the near-surface region: 3TiO 2 + 2Bi 2 O 3 → Bi 4 Ti 3 O 12 . At concentrations of n(Bi)/n(Ti) > 1 in the Bi 2 O 3 -TiO 2 system, compounds belonging to the family of layered phases are formed [33]. Due to titanium diffusion, a stable compound Bi 4 Ti 3 O 12 is formed [34].…”

Section: Structural Characteristicsmentioning

confidence: 99%

Surface Functionalization of TiO2 Nanotubes Modified with a Thin Film of BiFeO3

Ramazanov,

Orudzhev,

Gajiev

2023

Surfaces

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The atomic layer deposition method allows for the production of a thin film with a high aspect ratio on the uneven surface of titanium dioxide nanotubes TiO2(Nt). A modified BiFeO3/TiO2(Nt)/Ti (BFOT) structure with controllable electrical characteristics was obtained. BFOT possesses both ferroelectric and semiconductor properties with nonlinear conductivity dependent on the magnitude and duration of the voltage supply. Analysis of the temperature dependence of charge variation showed leakage currents in the BFOT structure due to the capture and release of charge carriers from defect levels. Surface modification of nanotubes with the multiferroic BiFeO3 allows for the creation of semiconductors with adaptive functional properties.

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“…In the last decade, much research has been focused on different layered compounds, such as Bi 5 FeTi 3 O 15 , Bi 6 Fe 2 Ti 3 O 18 , Bi 7 Fe 3 Ti 3 O 21 , etc. [22][23][24][25][26][27][28]. The reported study on the Aurivillius family embodies two main aspects: (i) aliovalent doping at A-and B-sites to enhance the multiferroic performance, and (ii) processing mediated structure-property correlations in ceramics, thin films, single crystals, and intergrowths [29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectric Properties of Aurivillius-Layered Perovskites

Veenachary,

Ramana,

Narendra Babu

et al. 2024

Crystals

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In the present work, we have synthesized rare-earth ion modified Bi4−xRExTi2Fe0.7Co0.3O12−δ (RE = Dy, Sm, La) multiferroic compounds by the conventional solid-state route. Analysis of X-ray diffraction by Rietveld refinement confirmed the formation of a polycrystalline orthorhombic phase. The morphological features revealed a non-uniform, randomly oriented, plate-like grain structure. The peaks evident in the Raman spectra closely corresponded to those of orthorhombic Aurivillius phases. Dielectric studies and impedance measurements were carried out. Asymmetric complex impedance spectra suggested the relaxation of charge carriers belonging to the non-Debye type and controlled by a thermally activated process. Temperature-dependent AC conductivity data showed a change of slope in the vicinity of the phase transition temperature of both magnetic and electrical coupling natures. Based on the universal law and its exponent nature, one can suppose that the conduction process is governed by a small polaron hopping mechanism but significant distortion of TiO6 octahedral. The doping of the A-sites with rare-earth element ions and changes in the concentrations of Fe and Co ions located on the B-sites manifested themselves in saturated magnetic hysteresis loops, indicating competitive interactions between ferroelectric and canted antiferromagnetic spins. The magnetic order in the samples is attributed to pair-wise interactions between adjacent Fe3+–O–Fe3+, Co2+/3+–O–Co3+/2+, and Co2+/3+–O–Fe3+ ions or Dzyaloshinskii–Moriya interactions among magnetic ions in the adjacent sub-lattices. As a result, enhanced magnetoelectric coefficients of 42.4 mV/cm-Oe, 30.3 mV/cm-Oe, and 21.6 mV/cm-Oe for Bi4−xDyxTi2Fe0.7Co0.3O12−δ (DBTFC), Bi4−xLaxTi2Fe0.7Co0.3O12−δ (LBTFC), and Bi4−xSmxTi2Fe0.7Co0.3O12−δ (SBTFC), respectively, have been obtained at lower magnetic fields (<3 kOe). The strong coupling of the Aurivillius compounds observed in this study is beneficial to future multiferroic applications.

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Aurivillius Phases Bim + 1Fem – 3Ti3O3m + 3: Synthesis, Structure, and Properties (a Review)

Cited by 21 publications

References 85 publications

Magnetic and Magnetoelectric Properties of AurivilliusThree- and Four-Layered Intergrowth Ceramics

Magnetic and Magnetoelectric Properties of AurivilliusThree- and Four-Layered Intergrowth Ceramics

Surface Functionalization of TiO2 Nanotubes Modified with a Thin Film of BiFeO3

Magnetoelectric Properties of Aurivillius-Layered Perovskites

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