Conductivity behavior and impedance studies in BaTiO3–CoFe2O4 magnetoelectric composites

Shankar, Shylashri; Thakur, O. P.; Jayasimhadri, M.

doi:10.1016/j.matchemphys.2019.05.095

Cited by 47 publications

(11 citation statements)

References 45 publications

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“…26 Shankar et al have synthesized BaTiO 3 -CoFe 2 O 4 via solid state reaction route and studied their impedance and conductivity behavior. 27 They found a low dielectric loss around 0.3 for BaTiO 3 -CoFe 2 O 4 composite over the frequency range of 100 Hz to 1 MHz. BaTiO 3 -Ni 0.5 Zn 0.5 Fe 2 O 4 composites have been prepared by Testino et al using two different procedures; mixed powders method and coprecipitation method.…”

Section: Introductionmentioning

confidence: 95%

(BaTiO₃)_1‐x + (Co_0.5Ni_0.5Nb_0.06Fe_1.94O₄)_x nanocomposites: Structure, morphology, magnetic and dielectric properties

et al. 2021

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Two phase-based nanocomposites consisting of dielectric barium titanate (BaTiO 3 or BTO) and magnetic spinel ferrite Co 0.5 Ni 0.5 Nb 0.06 Fe 1.94 O 4 (CNNFO) have been synthesized through solid state route. Series of (BaTiO 3 ) 1x + (Co 0.5 Ni 0.5 Nb 0.06 Fe 1.94 O 4 ) x nanocomposites with x content of 0.00, 0.25, 0.50, 0.75, and 1.00 were considered.The structure has been examined via X-rays diffraction (XRD) and indicated the occurrence of both perovskite BTO and spinel CNNFO phases in various nanocomposites. A phase transition from tetragonal BTO structure to cubic structure occurs with inclusion of CNNFO phase. The average crystallites size of BTO phase decreases, whereas that for the CNNFO phase increases with increasing x in various nanocomposites. The morphological observations revealed that the porosity is highly reduced, and the connectivity between grains is enhanced with increasing x content. The optical properties have been investigated by UV−vis diffuse reflectance spectroscopy. The deduced band gap energy (E g ) value is found to reduce with increasing the content of spinel ferrite phase. The magnetic as well as the dielectric properties were also investigated. The analysis showed that CNNFO ferrite phase greatly affects the magnetic properties and dielectric response of BTO material. The obtained findings can be useful to enhance the performances of magneto-dielectric composite-based systems.

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Section: Introductionmentioning

confidence: 95%

(BaTiO₃)_1‐x + (Co_0.5Ni_0.5Nb_0.06Fe_1.94O₄)_x nanocomposites: Structure, morphology, magnetic and dielectric properties

et al. 2021

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“…This suggests that the incorporation of Ni 2+ ions in the CFO lattice will create distortion in the lattice, which was due to the difference in the ionic radii of Ni 2+ and Co 2+ . 38,39 This distortion caused an increase in the bond length of Y-O and Fe-O, as was found from the results of the Rietvield refinement, and this further contributed toward the increased value of the atomic polarizability. Hence, e 0 was observed to increase while the tangent loss was reduced.…”

Section: Tangent Lossmentioning

confidence: 64%

“…The lowest value of e 0 was recorded for 15% nickel ion substitution, as the maximum number of dopants will help in creating a greater movement of Co ions and hence the overall value of e 0 gets reduced. 39…”

Section: Dielectric Studiesmentioning

confidence: 99%

“…The peak shifting took place because the immobile species of the sample became mobile at high temperature and defects also get introduced in to the lattice. 44 This results in relaxation and subsequently peak shifting and broadening. This relaxation process in the nickel and yttrium co-substituted cobalt ferrites is beneficial for high-frequency region for fast switching applications of applied electric fields.…”

Section: Impedance Analysismentioning

confidence: 99%

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Unveiling the impact of Ni²⁺/Y³⁺ co-substitution on the structural, dielectric, and impedance properties of multiferroic spinel ferrite for hydroelectric cell application

Jain

Subramanian

Thakur

2023

Phys. Chem. Chem. Phys.

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“…The P-E loops were also used to estimate the energy storage density (W) and discharge efficiency (η) of SBBNX ceramics using an expression reported elsewhere. 64 The obtained values of W and η are also presented in Table V, with the highest energy storage density of 21.6 mJ cm −3 and efficiency of 64.3% achieved for X = 0.3 in Sr 1−x Bi 2+2X/3 Nb 2 O 9 .…”

Section: Resultsmentioning

confidence: 82%

Exploration of the Structural, Dielectric, Ferroelectric, and Piezoelectric Properties in Non-stoichiometric Sr_1−XBi_2+2X/3Nb₂O₉ Ceramics

Singh,

Gautam,

Luthra

et al. 2023

ECS J. Solid State Sci. Technol.

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In this study, the authors focused on the preparation and characterization of Lead-free ferroelectric ceramics known as Sr1−XBi2+2X/3Nb2O9: SBBNX, where 0.0≤ × ≤0.4. The ceramics were synthesized using a conventional solid-state reaction route. The researchers performed X-ray diffraction (XRD) analysis to confirm the phase formation and employed the Rietveld refinement technique. The results indicated that the prepared SBBNX ceramics exhibited a single phase with an orthorhombic structure, specifically belonging to the A21am space group. All samples were subjected to analysis using field emission scanning electron microscopy (FESEM) to investigate their surface morphology. The micrographs revealed a uniform distribution of grains (of size 2–4 μm ) on the surface, with distinct grain boundaries. An increasing trend in both the dielectric constant (from 99 to 220 at room temperature) and transition temperature (from 396 °C to 490 °C) was noted with an increase of Bi content in SBN. The researchers estimated the activation energies by analyzing the Arrhenius plots of the ac conductivity. The obtained values ranged from 0.62 to 1.25 eV, indicating the presence of motion of oxygen vacancies in the SBBNX ceramics. The primary objective of this study was to optimize the Sr/Bi ratio in SBBNX ceramics to enhance their potential use in non-volatile random access memory (NVRAM) applications and high-temperature piezoelectric devices.

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Conductivity behavior and impedance studies in BaTiO3–CoFe2O4 magnetoelectric composites

Cited by 47 publications

References 45 publications

(BaTiO₃)_1‐x + (Co_0.5Ni_0.5Nb_0.06Fe_1.94O₄)_x nanocomposites: Structure, morphology, magnetic and dielectric properties

(BaTiO₃)_1‐x + (Co_0.5Ni_0.5Nb_0.06Fe_1.94O₄)_x nanocomposites: Structure, morphology, magnetic and dielectric properties

Unveiling the impact of Ni²⁺/Y³⁺ co-substitution on the structural, dielectric, and impedance properties of multiferroic spinel ferrite for hydroelectric cell application

Exploration of the Structural, Dielectric, Ferroelectric, and Piezoelectric Properties in Non-stoichiometric Sr_1−XBi_2+2X/3Nb₂O₉ Ceramics

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Conductivity behavior and impedance studies in BaTiO3–CoFe2O4 magnetoelectric composites

Cited by 47 publications

References 45 publications

(BaTiO3)1‐x + (Co0.5Ni0.5Nb0.06Fe1.94O4)x nanocomposites: Structure, morphology, magnetic and dielectric properties

(BaTiO3)1‐x + (Co0.5Ni0.5Nb0.06Fe1.94O4)x nanocomposites: Structure, morphology, magnetic and dielectric properties

Unveiling the impact of Ni2+/Y3+ co-substitution on the structural, dielectric, and impedance properties of multiferroic spinel ferrite for hydroelectric cell application

Exploration of the Structural, Dielectric, Ferroelectric, and Piezoelectric Properties in Non-stoichiometric Sr1−XBi2+2X/3Nb2O9 Ceramics

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Product

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About

(BaTiO₃)_1‐x + (Co_0.5Ni_0.5Nb_0.06Fe_1.94O₄)_x nanocomposites: Structure, morphology, magnetic and dielectric properties

(BaTiO₃)_1‐x + (Co_0.5Ni_0.5Nb_0.06Fe_1.94O₄)_x nanocomposites: Structure, morphology, magnetic and dielectric properties

Unveiling the impact of Ni²⁺/Y³⁺ co-substitution on the structural, dielectric, and impedance properties of multiferroic spinel ferrite for hydroelectric cell application

Exploration of the Structural, Dielectric, Ferroelectric, and Piezoelectric Properties in Non-stoichiometric Sr_1−XBi_2+2X/3Nb₂O₉ Ceramics