Enhanced dielectric permittivity on yttrium doped cobalt ferrite nanoparticles

Franco, A.; Pessoni, H.V.S.; Alves, Thiago Eduardo Pereira

doi:10.1016/j.matlet.2017.04.101

Cited by 31 publications

(5 citation statements)

References 26 publications

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“…The polarization observed, resulting from local charge displacement at grain boundaries, primarily occurs due to electron hopping. The variation in ε ′ with frequency in SNFs can be further explored using the Maxwell-Wagner model (MWM) [41]. This model suggests two dielectric layers within the SNFs material.…”

Section: Dielectric Properties Of Pure Cd-co and Eu 3+ Doped Cd-co Snfsmentioning

confidence: 99%

Rare-earth (Eu³⁺) substitution impact on the structural, morphological, magneto-dielectric, and electrochemical properties of Cd_0.45Co_0.55Fe_2−yEu _y O₄ spinel nanoferrites

Afzal,

Alhadhrami,

Ibrahim

et al. 2024

J. Phys.: Condens. Matter

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A series of Cd_0.45 Co_0.55 Fe_(2-y) Eu_y O_(4 )(y = 0.0, 0.1, 0.2, 0.3) spinel nanoferrites (SNFs) were synthesized using a self-igniting process and employed as electrode materials for supercapacitor applications. The results demonstrated the formation of a single SNFs phase, as shown by the XRD data. The crystallite size lies between the range of 29.30 nm – 51.12 nm. The porosity percentage is within the range of 31.37% – 32.99%. Rietveld refinement of XRD and Raman analysis revealed the pure spinel phase and no secondary phase was observed. The saturation magnetization and magnetic anisotropy were also decreased with the addition of Eu3+ in Cd-Co SNFs. The high coercive field was enhanced for Eu3+ doping as compared to pure Cd-Co SNFs. The dielectric constant was improved with the substitution of Eu3+ in Cd-Co SNFs. The dielectric tangent loss was reduced with the doping of Eu3+. The electrochemical performance of the Eu3+ doped Cd-Co SNFs achieved an impressive maximum specific capacitance at a lower scan rate. Based on these findings, the outstanding electrochemical performance of the Eu3+ doped Cd-Co SNFs suggests their potential as promising materials for high-frequency, magnetic ferrofluid, and supercapacitor electrodes.

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Section: Dielectric Properties Of Pure Cd-co and Eu 3+ Doped Cd-co Snfsmentioning

confidence: 99%

Rare-earth (Eu³⁺) substitution impact on the structural, morphological, magneto-dielectric, and electrochemical properties of Cd_0.45Co_0.55Fe_2−yEu _y O₄ spinel nanoferrites

Afzal,

Alhadhrami,

Ibrahim

et al. 2024

J. Phys.: Condens. Matter

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“…Over the past few years, there seems to be a developing interest in corn oil biodiesel as a renewable fuel option, which is increasingly being seen as a viable alternative to conventional fossil fuels. This shift in attention may be attributed to the environmental advantages associated with the use of corn oil biodiesel [1][2][3][4][5][6]. However, biodiesel is subject to many restrictions, such as insufficient cold flow properties, decreased oxidative stability, and poor electrical conductivity [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Electrical properties evaluation of corn oil biodiesel mixed with lubricant as a potential source of energy

Raviteja Surakasi,

Janaki Pakalapati,

Manyala Gangadhar Rao

et al. 2024

Int. J. Sci. Res. Arch.

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The main aim of this study is to assess the electrical characteristics pertaining to a biodiesel derived from corn oil and lubricant. The first step in the synthesis of biodiesel from corn oil involves the transesterification process. Subsequently, the biodiesel is combined with a base lubricant (20W-40T) in varying proportions, spanning from 5% to 40% of the overall volume. The measurement and analysis of biodiesel blends necessitate consideration of crucial electrical parameters, including breakdown voltage, resistivity, permittivity and electrical conductivity. The decrease in breakdown voltage, permittivity, and electrical conductivity that ensues from an increase in diameter may be attributed to the corresponding increase in diameter. Nevertheless, a positive association exists between the greater quantity of base lubricant and an elevation in resistivity. Despite the positive correlation between resistivity and diameter, this phenomenon persists. The potential cause for the enhancement of the electrical properties might be attributed to the dispersion of the fundamental lubricant.

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“…The increasing molarity concentration of yttrium-doped cobalt ferrite can decrease lattice strain and the length of the lattice constant [20], reduce magnetic saturation [20,21], and decrease crystallite size [21][22][23]. The decreasing molarity concentration of yttrium-doped cobalt ferrite can also increase the energy band gap of cobalt ferrite compounds [24] and dielectric permittivity [25]. Various methods can prepare yttrium-doped cobalt ferrite nanoparticle samples.…”

Section: Introductionmentioning

confidence: 99%

Decreasing of Magnetic Saturation of Yttrium Doped Cobalt Ferrite Prepared by the Sol-Gel Auto-Combustion

Rahardjo,

Budiawanti,

Suharno

et al. 2024

Trends Sci

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In this research, a nano-sized cobalt ferrite material doped with Yttrium has been successfully fabricated using the sol-gel method of automatic combustion with variations in low sintering temperatures of 200, 300 and 400 °C. The results of refinement of XRD data using the Rietveld method show that the Yttrium-doped cobalt ferrite compound with a Yttrium concentration molarity of 0.1 possess a cubic crystal system and Fd-3m space group. The increasing annealing temperatures also increase the crystallite size of Yttrium-doped cobalt ferrite with the highest magnitude of 16.05 nm. The FTIR results of the samples indicated the presence of Co-O bonds around wave number 385 cm−1 and Fe-O bonds around wave number 582 cm−1 which are characteristic of the presence of cobalt ferrite compounds. From the VSM measurement results, it can be seen that there is a decrease in magnetic saturation with an increase in annealing temperature. The presence of Yttrium substitution, which takes the place of Fe3+ in cobalt ferrite material, indicates lower saturation magnetization. Image from SEM results showed samples have nanoparticle crystallite size. Evaluation of potential photocatalyst applications using a UV-Visible Spectrophotometer (UV-Vis). For Yttrium doped cobalt ferrite at 200 °C, the best degradation efficiency of Congo Red findings showed a magnitude of 76.10 %; the results are confirmed by the occurrence of the smallest crystallite size (15.11 nm). HIGHLIGHTS Preparation of yttrium-doped cobalt ferrite by the sol-gel auto-combustion method with various annealing temperatures The presence of Yttrium substitution, which takes the place of Fe3+ in cobalt ferrite material, indicates lower saturation magnetization Yttrium-doped cobalt is applied for photocatalytic Congo Red dye in water with the best performance according to the smallest crystallite size GRAPHICAL ABSTRACT

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Enhanced dielectric permittivity on yttrium doped cobalt ferrite nanoparticles

Cited by 31 publications

References 26 publications

Rare-earth (Eu³⁺) substitution impact on the structural, morphological, magneto-dielectric, and electrochemical properties of Cd_0.45Co_0.55Fe_2−yEu _y O₄ spinel nanoferrites

Rare-earth (Eu³⁺) substitution impact on the structural, morphological, magneto-dielectric, and electrochemical properties of Cd_0.45Co_0.55Fe_2−yEu _y O₄ spinel nanoferrites

Electrical properties evaluation of corn oil biodiesel mixed with lubricant as a potential source of energy

Decreasing of Magnetic Saturation of Yttrium Doped Cobalt Ferrite Prepared by the Sol-Gel Auto-Combustion

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Enhanced dielectric permittivity on yttrium doped cobalt ferrite nanoparticles

Cited by 31 publications

References 26 publications

Rare-earth (Eu3+) substitution impact on the structural, morphological, magneto-dielectric, and electrochemical properties of Cd0.45Co0.55Fe2−y Eu y O4 spinel nanoferrites

Rare-earth (Eu3+) substitution impact on the structural, morphological, magneto-dielectric, and electrochemical properties of Cd0.45Co0.55Fe2−y Eu y O4 spinel nanoferrites

Electrical properties evaluation of corn oil biodiesel mixed with lubricant as a potential source of energy

Decreasing of Magnetic Saturation of Yttrium Doped Cobalt Ferrite Prepared by the Sol-Gel Auto-Combustion

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Rare-earth (Eu³⁺) substitution impact on the structural, morphological, magneto-dielectric, and electrochemical properties of Cd_0.45Co_0.55Fe_2−yEu _y O₄ spinel nanoferrites

Rare-earth (Eu³⁺) substitution impact on the structural, morphological, magneto-dielectric, and electrochemical properties of Cd_0.45Co_0.55Fe_2−yEu _y O₄ spinel nanoferrites