Tuning structural, magnetic, electrical, and dielectric properties of MgFe2O4 synthesized by sol-gel followed by heat treatment

Araújo, J. C. R. de; Araújo-Barbosa, S.; Souza, A. L. R.; Iglesias, C. A. M.; Xavier, J.; Souza, Pâmella Batista de; Cid, Cristiani Campos Plá; Azevedo, S.; Silva, Rodolfo Bezerra da; Corrêa, M.A.; Medeiros, S.N. de; Silva, E.F.; Bohn, F.

doi:10.1016/j.jpcs.2021.110051

Cited by 43 publications

(15 citation statements)

References 73 publications

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“…A mechanism analogous to the conduction process is involved in the polarization of ferrites, according to Rabinkin and Novikova . In Fe 2+ ↔ Fe 3+ , the electron exchange produces a local displacement of electrons in the direction of the applied field. , These electrons are responsible for polarization. The high value of ε′ at lower frequencies is because of the dominance of the species, such as Fe 2+ ions, O 2 vacancies, grain boundaries defect, etc.…”

Section: Resultsmentioning

confidence: 99%

Influence of Zinc Substitution on the Structural, Dielectric, and Gas-Sensing Properties of Mg_1–xZn_xFe₂O₄ Nanoparticles

Nazir,

Javaid,

Baig

et al. 2023

ACS Omega

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In the present work, Mg1–x Zn x Fe2O4 (MZFO) nanoparticles with x = 0.0, 0.2, 0.35, and 0.5 were synthesized via a chemical coprecipitation method. The study aimed to explore the effect of substituting Mg with Zn in MZFO on its structural, dielectric, and gas-sensing properties. The spinel phase formation was confirmed using X-ray diffraction, and the morphology of the prepared nanoparticles was revealed using scanning electron microscopy. Fourier transform infrared spectroscopy (FTIR) analysis confirmed the band ranges of 500–600 cm–1 for tetrahedral and 390–450 cm–1 for octahedral lattice sites. The dielectric data showed that Zn substitution in MZFO decreased both the dielectric constant and loss with increasing frequencies and attained a stagnant value at higher frequencies. Furthermore, the gas-sensing characteristics of Zn-substituted spinel ferrites at room temperature for CO2, O2, and N2 were studied. The nanostructured MZFO exhibited high sensitivity in the order of CO2 > O2 ≫ N2 and showed a good response time of (∼1 min) for CO2, demonstrating that MZFO can be a good potential candidate for gas-sensing applications.

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Section: Resultsmentioning

confidence: 99%

Influence of Zinc Substitution on the Structural, Dielectric, and Gas-Sensing Properties of Mg_1–xZn_xFe₂O₄ Nanoparticles

Nazir,

Javaid,

Baig

et al. 2023

ACS Omega

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“…We employ magnesium ferrite ( The MgFe 2 O 4 nanoparticles are synthesized using the solgel method [50,51], with the same experimental parameters employed in the preparation of the powders investigated in Ref. [29], followed by heat treatment at 973 K. The CoFe 2 O 4 nanoparticles in turn are produced by coprecipitation method [52,53] following the procedures described in Ref. [30], with subsequent heat treatment at 1023 K. At last, the nanorods of BaFe 12 O 19 are prepared through ionic coordination reaction method under the same conditions as the samples studied in Ref.…”

Section: Appendixmentioning

confidence: 99%

“…Nevertheless, recent advances in the field of magnetization dynamics have stimulated renewed interest in phenomena involving the interactions between magnetic nanoparticles. For magnetic systems, it is well known their magnetic properties are dependent on numerous issues, including experimental parameters employed in the production of the sample as well as features owing to the chemical composition [15,[24][25][26][27][28][29][30]. For nanoparticles, in addition, the interactions between particles have key role on the whole magnetic properties and magnetization dynamics [3,[31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Unambiguous signature of exchange interactions between nanoparticles in a collective system

Iglesias,

de Araújo,

Xavier

et al. 2021

Preprint

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We report a simple, efficient manner to assess magnetic interactions, more specifically the exchange interaction, in systems as blocked magnetic nanoparticles. Specifically, we investigate what is the theoretical limit for the external magnetic susceptibility in a system described by the plain old Stoner-Wohlfarth model. We go beyond and introduce a general mean field theory for interacting systems, thus estimating how the magnetic susceptibility is affected due to the dipolar and exchange interactions inside the system. We disclose a fundamental inequality for the magnetic susceptibility and show its violation is an unambiguous signature of the existence of exchange interactions between nanoparticles in a collective system. To test the robustness of our theoretical achievements, we examine magnetization measurements and Henkel plots for blocked magnetic nanopowders. The agreement between experiment and theory provides evidence to confirm the validity of our findings.

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“…Various synthesis approaches, such as co-precipitation [ 13 ], solvothermal [ 14 ], one-pot solution combustion [ 15 ], hydrothermal [ 16 ] and microwave-assisted ball milling [ 17 ] were utilized for the preparation of magnesium ferrite. Another widely applied synthesis technique is the aqueous sol-gel method [ 18 , 19 , 20 ]. Using different complexing agents allows the preparation of phase-pure magnesium ferrite spinel at a low processing temperature in a relatively short time.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Synthesis and Characterization of Yttrium-Doped MgFe2O4 Spinel

et al. 2022

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In this study, an environmentally friendly sol-gel synthetic approach was used for the preparation of yttrium‑doped MgFe2O4. Two series of compounds with different iron content were synthesized and A-site substitution effects were investigated. In the first series, the iron content was fixed and the charge balance was suggested to be compensated by a partial reduction of Fe3+ to Fe2+ or formation of interstitial O2− ions. For the second series of samples, the iron content was reduced in accordance with the substitution level to compensate for the excess of positive charge, which accumulates due to replacing divalent Mg2+ with trivalent Y3+ ions. Structural, morphological and magnetic properties were inspected. It was observed that single‑phase compounds can only form when the substitution level reaches 20 mol% of Y3+ ions and iron content is reduced. The coercivity as well as saturation magnetization decreased with the increase in yttrium content. Mössbauer spectroscopy was used to investigate the iron content in both tetrahedral and octahedral positions.

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Tuning structural, magnetic, electrical, and dielectric properties of MgFe2O4 synthesized by sol-gel followed by heat treatment

Cited by 43 publications

References 73 publications

Influence of Zinc Substitution on the Structural, Dielectric, and Gas-Sensing Properties of Mg_1–xZn_xFe₂O₄ Nanoparticles

Influence of Zinc Substitution on the Structural, Dielectric, and Gas-Sensing Properties of Mg_1–xZn_xFe₂O₄ Nanoparticles

Unambiguous signature of exchange interactions between nanoparticles in a collective system

Sol-Gel Synthesis and Characterization of Yttrium-Doped MgFe2O4 Spinel

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Tuning structural, magnetic, electrical, and dielectric properties of MgFe2O4 synthesized by sol-gel followed by heat treatment

Cited by 43 publications

References 73 publications

Influence of Zinc Substitution on the Structural, Dielectric, and Gas-Sensing Properties of Mg1–xZnxFe2O4 Nanoparticles

Influence of Zinc Substitution on the Structural, Dielectric, and Gas-Sensing Properties of Mg1–xZnxFe2O4 Nanoparticles

Unambiguous signature of exchange interactions between nanoparticles in a collective system

Sol-Gel Synthesis and Characterization of Yttrium-Doped MgFe2O4 Spinel

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Influence of Zinc Substitution on the Structural, Dielectric, and Gas-Sensing Properties of Mg_1–xZn_xFe₂O₄ Nanoparticles

Influence of Zinc Substitution on the Structural, Dielectric, and Gas-Sensing Properties of Mg_1–xZn_xFe₂O₄ Nanoparticles