Enhancement in the magnetoelectric and energy storage properties of core-shell-like <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0006.svg"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">CoFe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub><mml:mo>−</mml:mo><mml:mi mathvariant="italic">BaTi</mml:mi><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow

Ahmed, S.; Rehman, Atta Ur; Bashir, Seemab; Iqbal, Nadeem; Khalid, Waqas; Ali, Zulqurnain; Nadeem, M.

doi:10.1016/j.jallcom.2021.160875

Cited by 27 publications

(6 citation statements)

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“…It can also be observed that the porosity of the sample was decreased with the addition of cobalt ferrite in the BTNO matrix. Moreover, the high resolution image of the bare BTNO nanostructure confirms the hexagonal shape of the grains, whereas the BTNCF4 nanocomposite shows the spherical shape of the grains 48 . The primary reason for the slight transformation in the grain shape from hexagonal to spherical shape is due to the larger driving force during the grain growth process.…”

Section: Resultsmentioning

confidence: 84%

Stress‐induced multiferroic properties of lead‐free (1 − x)BTNO–(x)CFO nanocomposites

Arshad,

Khan,

Abushad

et al. 2024

J Am Ceram Soc.

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Multiferroic composites of (1 − x)BaTi0.98Ni0.02O3–(x)CoFe2O4 (0 ≤ x ≤ 0.06) were prepared through conventional solid‐state reaction route. X‐ray diffraction (XRD) studies along with the Rietveld refinement endorse the multiphase nature of the nanocomposite samples. The XRD peaks of the tetragonal bare barium titanate and the inverse cubic spinel of cobalt ferrite nanostructures phase can be identified separately. The tetragonality ratio of the bare barium titanate drops with the addition of the guest material, i.e., cobalt ferrite in the ferroelectric matrix. The Fourier transform infrared (FTIR) spectra confirm the main absorption bands near 540–560 cm−1, corresponding to the metal‐oxide absorption band (ν1 mode), and are related to the stretching modes of the Ti–O bonds. The Raman spectra also signify the two symmetries confirming the nanocomposites’ ferroelectric and ferromagnetic phases. The surface morphology studies reveal the hexagonal and spherical shape of the grains in the nanostructures and nanocomposites. The energy‐dispersive x‐ray spectroscopy (EDX) spectra confirm the presence of all the elements in the samples. The ferroelectricity in the nanocomposite drops due to fluctuations in the valence state of Fe2+/Fe3+ that enhances the leakage current of the nanocomposites. The magnetic moment and dielectric constant of the nanocomposites are enhanced as the guest compound CoFe2O4 is added to the bare BaTi0.98Ni0.02O3. Thus, the simultaneous coexistence of ferroelectric and magnetic ordering at room temperature confirms the multiferroic behavior of the nanostructure and the nanocomposites.

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Section: Resultsmentioning

confidence: 84%

Stress‐induced multiferroic properties of lead‐free (1 − x)BTNO–(x)CFO nanocomposites

Arshad,

Khan,

Abushad

et al. 2024

J Am Ceram Soc.

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“…Figure 8(a) exhibits the recorded variation of reflectance (%) against wavelength for 0%, 2%, 4%, 6% and 8% copper doped YCFO. The variation between (F(R)hυ) 2 and hυ for five different doped compositions of copper in YCFO has been shown in figure 8(b). The reflectance pattern of the Y-Cu co-doped CFO has been studied elaboratively by employing well established as well as modified Kubelka-Munk function as given by equation (2) [28,29].…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

“…The reflectance pattern of the Y-Cu co-doped CFO has been studied elaboratively by employing well established as well as modified Kubelka-Munk function as given by equation (2) [28,29]. This function provides the direct relation between reflectance and energy gap as follows: where, F(R) represents the Kubelka Munk function and R represents the reflectance To calculate the value of the bandgap using reflectance spectra, a graph has been plotted between (F(R)hυ) 2 and energy (hυ) for Cu (0%, 2%, 4%, 6%, 8%) doped YCFO samples as shown in figure 8(b). The plotted graphs have been further extrapolated to Y = 0 on the X-axis to exactly locate the bandgap values.…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

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Advancements in multiferroic, dielectric, and impedance properties of copper–yttrium co-doped cobalt ferrite for hydroelectric cell applications

Jain,

Shankar,

Thakur

2024

J. Phys.: Condens. Matter

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This paper explores yttrium and copper co-doped cobalt ferrite [Co1-xCuxFe1.85Y0.15O4] synthesized via the sol-gel auto combustion route (0.0 ≤ x ≤ 0.08). Investigating the impact of co-dopants on CoFe2O4, the study reveals altered cation distribution affecting structure, multiferroic, and electrical properties. XRD studies show nanocrystalline co-doped cobalt ferrites with lattice expansion and smaller grains due to Cu-Y co-doping. FTIR confirms inverse spinel family classification with tetrahedral lattice shrinkage. FESEM indicates a grain size of approximately 0.12 μm. Ferroelectric analysis reveals a peak saturation polarization of 23.42 μC/cm2 for 8% copper doping, attributed to increased Fe3+ ions at tetrahedral sites. Saturation magnetization peaks at 54.4706 emu/g for 2% Cu2+ ion substitution [Co0.98Cu0.02Fe1.85Y0.15O4] and decreases to 37.09 emu/g for 4% Cu substitution due to irregular iron atom distribution at tetrahedral sites. Dielectric studies uncover Maxwell-Wagner Polarization and high resistance in grain and grain boundaries using Impedance Spectroscopy. Fabricated hydroelectric cells exhibit improved ionic diffusion, suggesting potential applications.

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“…The polarization behavior including dielectric constant and P-E hysteresis loop is also an important factor to determine energy storage performance. [43][44][45][46] The dielectric constant and dielectric loss measured at different frequency of 0, 0.5, 5 and 10 mol. % Ca 2+ -doped thin films are shown in Figure 4A-B.…”

Section: Dielectric and Ferroelectric Propertiesmentioning

confidence: 99%

Ca doping to enhance energy storage performance of lead‐free SrTi_0.99Mn_0.01O₃ thin films with low hysteresis

Wang

Zhang

2022

Nano Select

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Dielectric materials with excellent energy storage performance are urgently needed in advanced electrical power systems. We have reported that Mn2+‐doped SrTiO3 thin films have high energy storage density. However, the thin films exhibit fat polarization‐electric field hysteresis loops with high hysteresis, which is not conducive to greater energy storage performance. In this work, the Ca2+‐doped Sr1‐xCaxTi0.99Mn0.01O3 thin films are fabricated to construct slim polarization‐electric field hysteresis loops with low hysteresis for obtaining excellent energy storage performance. Because Ca2+ can break the long‐range ferroelectric order of SrTi0.99Mn0.01O3, the domain size decreases and the coupling of domains weakens, ultimately leading to low hysteresis. Moreover, doping Ca2+ can induce distortion of the octahedral [TiO6] to form local polarization regions. When doped an appropriate amount of Ca2+, local lattice distortion plays an important role in polarization behavior, which helps to enhance polarization. Meanwhile, the Ca2+‐doped thin films also possess good insulation. Finally, the higher energy storage density of 63.9 J cm‐3 is achieved in the Sr0.9Ca0.1Ti0.99Mn0.01O3 thin film. When the electric field is less than 4000 kV cm‐1, the energy storage efficiency remains above 70%. Simultaneously, a wide working temperature range from ‐100℃ to 100℃ is also obtained.

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Enhancement in the magnetoelectric and energy storage properties of core-shell-like CoFe2O4−BaTiO

Cited by 27 publications

References 50 publications

Stress‐induced multiferroic properties of lead‐free (1 − x)BTNO–(x)CFO nanocomposites

Stress‐induced multiferroic properties of lead‐free (1 − x)BTNO–(x)CFO nanocomposites

Advancements in multiferroic, dielectric, and impedance properties of copper–yttrium co-doped cobalt ferrite for hydroelectric cell applications

Ca doping to enhance energy storage performance of lead‐free SrTi_0.99Mn_0.01O₃ thin films with low hysteresis

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Enhancement in the magnetoelectric and energy storage properties of core-shell-like CoFe2O4−BaTiO

Cited by 27 publications

References 50 publications

Stress‐induced multiferroic properties of lead‐free (1 − x)BTNO–(x)CFO nanocomposites

Stress‐induced multiferroic properties of lead‐free (1 − x)BTNO–(x)CFO nanocomposites

Advancements in multiferroic, dielectric, and impedance properties of copper–yttrium co-doped cobalt ferrite for hydroelectric cell applications

Ca doping to enhance energy storage performance of lead‐free SrTi0.99Mn0.01O3 thin films with low hysteresis

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Ca doping to enhance energy storage performance of lead‐free SrTi_0.99Mn_0.01O₃ thin films with low hysteresis