Structural and Magnetic Properties of Spinel Ferrite Nanoparticles

Silva, F G da; Depeyrot, J.; Campos, Alex Fabiano Cortez; Aquino, Renata; Fiorani, D.; Peddis, Davide

doi:10.1166/jnn.2019.16877

Cited by 83 publications

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“…NiZn ferrite nanoparticles are becoming more and more important in the field of bio-medical applications for instance magnetic resonance imaging (MRI), drug delivery systems and hyperthermia treatment of cancer by using their appropriate magnetic properties, antimicrobial activity and biological compatibility [8,9]. Figure 1 shows the spinel structure (the lattice parameter is about 0.84 nm) is formed by 24 cations (Fe 2+ , Zn 2+ , Co 2+ , Mn 2+ , Ni 2+ , Mg 2+ , Fe 2+ , Gd 2+ ) and 32 O 2− anions and generally has a chemical form of AB 2 O 4 , which is designated as a cubic closed-packing of O 2− ions [10][11][12][13]. The round and the square brackets represent the tetrahedral interstitial A site and the larger octahedral interstitial B site, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The round and the square brackets represent the tetrahedral interstitial A site and the larger octahedral interstitial B site, respectively. Zinc ferrite is called a normal spinel structure of the form ZnFe 2 O 4 , where Zn 2+ ions occupy the tetrahedral sites and Fe 3+ ions occupy the octahedral sites [13]. Nickel ferrite is called an inverse spinel structure of the form FeNiFeO 4 , where Ni 2+ ions occupy the octahedral sites, and half the Fe 3+ ions occupy the tetrahedral sites and the other half occupy the octahedral sites [10].…”

Section: Introductionmentioning

confidence: 99%

“…Sci. 2020, 10, x FOR PEER REVIEW 2 of 11 form of AB2O4, which is designated as a cubic closed-packing of O 2− ions [10][11][12][13]. The round and the square brackets represent the tetrahedral interstitial A site and the larger octahedral interstitial B site, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Structural and Magnetic Properties of NiZn Ferrite Nanoparticles Synthesized by a Thermal Decomposition Method

et al. 2020

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Ni1−xZnxFe2O4 (x = 0.5, 0.6, 0.7) nanoparticles were synthesized by a thermal decomposition method. The synthesized particles were identified as pure spinel ferrite structures by X-ray diffraction analysis, and they were calculated to be 46–51 nm in diameter by the Scherrer equation, depending on the composition. In the FE-SEM image, the ferrite nanoparticles have spherical shapes with slight agglomeration, and the particle size is about 50 nm, which was consistent with the value obtained by the Scherrer equation. The lattice parameter of the ferrite nanoparticles monotonically increased from 8.34 to 8.358 Å as the Zn concentration increased from 0.5 to 0.7. Initially, the saturation magnetization value slowly decreases from 81.44 to 83.97 emu/g, then quickly decreases to 71.84 emu/g as the zinc content increases from x = 0.5, through 0.6, to 0.7. Ni1−xZnxFe2O4 toroidal samples were prepared by sintering ferrite nanoparticles at 1250 °C and exhibited faceted grain morphologies in the FE-SEM images with their grain sizes being around 5 µm regardless of the Zinc content. The real magnetic permeability (μ′) of the toroidal samples measured at 5 MHz was monotonically increased from 106, through 150, to 217 with increasing the Zinc content from x = 0.5, through 0.6, to 0.7. The cutoff frequency of the ferrite toroidal samples was estimated to be about 20 MHz from the broad maximum point in the plot of imaginary magnetic permeability (μ″) vs. frequencies, which seemed to be associated with domain wall resonance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural and Magnetic Properties of NiZn Ferrite Nanoparticles Synthesized by a Thermal Decomposition Method

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“…Os princípios do ferrimagnetismo são ilustrados pelas ferritas cúbicas, materiais iônicos que podem ser representados pela fórmula química MFe 2 O 4 , em que M representa íons divalentes como Ni(II), Mn(II), Co(II) e Cu(II). 4,5 Esses materiais exibem alta magnetização e baixas perdas magnéticas, possuindo aplicações nas áreas de catálise, sistemas de armazenamento de informações, tecnologias de ferrofluidos e diagnósticos médicos. 6,7 Por serem insolúveis em bases fortes, estes materiais também foram relatados como efetivos adsorventes devido à alta área superficial e fácil separação por decantação magnética.…”

Section: Introductionunclassified

“…cobalto com as duas propriedades de interesse: magnética e luminsecente. Para tanto, partículas do tipo core-shell, no qual o material magnético foi recoberto pelo luminescente5 foram preparadas. O material tem composição de ferritas de cobalto (CoFe 2 O 4 ) recoberto com dióxido de silício dopado com fenantrolina e európio, CoFe 2 O 4 @SiO 2 :phen:Eu +3 .MetodologiaO core magnético foi sintetizado separadamente pelo método de coprecipitação.…”

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Síntese e Caracterização de Nanopartículas de CoFe 2O4@SiO2:phen:Eu+3 com Propriedades Magnéticas e Luminescentes

et al. 2020

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Materiais com propriedades magnéticas e luminescentes possuem amplas aplicações biomédicas. A ferrita de cobalto (CoFe2O4) destaca-se devido a sua alta estabilidade e magnetização. A fi de aumentar a biocompatibilidade e conferir a luminescência, este material pode ser recoberto por dióxido de silício (SiO2) contendo íons európio. Assim, o trabalho tem por fialidade recobrir o CoFe2O4 (core) com SiO2 e íons európio (III) (shell). As amostras foram caracterizadas estruturalmente por DRX e apresentaram sistema monofásico. E a exposição das amostras à radiação eletromagnética e ao campo magnético confimou a obtenção do material com ambas as propriedades de interesse.

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Size‐Dependent Structural, Optical and Photocatalytic Properties of Zirconium Ferrite Prepared via a Sol‐Gel Route

Kaur

Singh

2023

ChemistrySelect

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Zirconium ferrite (ZrFe2O4) nanoparticles with different sizes (43, 56 and 69 nm) were synthesized by the sol‐gel synthesis technique after calcination at 400, 600 and 800 °C, respectively. The X‐ray diffraction (XRD) method was used to study the change in crystal structure with temperature andrevealed the increase inaverage crystallite sizewith the increase in calcination temperature.Scanning electron microscopy (SEM) and energy‐dispersive X‐ray spectroscopy (EDX) were used to investigate the morphology and elemental analysis. The SEM study confirmed the spherical shape and homogenous distribution of the nanoparticles.The optical band gap reduced from 2.5 eV to 2.24 eV with an increase in particle size from 43 to 69 nm, studied using UV‐Vis spectroscopy.The ZrFe2O4 nanoparticles with smaller particle size displayed better photocatalytic activities than that with larger particle size for the degradation of hazardous dyes methylene blue (MB) and rhodamine B (RhB) under UV radiation. The photodegradation of MB and RhB catalyzed by the ZrFe2O4 nanoparticles was a pseudo‐first‐order reaction. The maximum degradation for MB and RhB was 70 % and 95 %,respectively, in just 120 minutes for the sample having the smallest size due to its large surface area.This study confirmed that the ZrFe2O4 nanoparticles are apromisingcandidate for the catalysis of organic dyes through the redox reaction.

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Structural and Magnetic Properties of Spinel Ferrite Nanoparticles

Cited by 83 publications

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Structural and Magnetic Properties of NiZn Ferrite Nanoparticles Synthesized by a Thermal Decomposition Method

Structural and Magnetic Properties of NiZn Ferrite Nanoparticles Synthesized by a Thermal Decomposition Method

Síntese e Caracterização de Nanopartículas de CoFe 2O4@SiO2:phen:Eu+3 com Propriedades Magnéticas e Luminescentes

Size‐Dependent Structural, Optical and Photocatalytic Properties of Zirconium Ferrite Prepared via a Sol‐Gel Route

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