Semi-hard magnetic properties of nanoparticles of cobalt ferrite synthesized by the co-precipitation process

Hosni, N.; Zehani, K.; Bartoli, T.; Bessaïs, L.; Maghraoui-Meherzi, H.

doi:10.1016/j.jallcom.2016.09.252

Cited by 66 publications

(24 citation statements)

References 33 publications

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“…It exhibits remarkably unique and interesting properties such as high saturation magnetisation, high coercivity and anisotropy, good mechanical hardness, chemical stability, and has the highest magnetostriction of all 3d-element-based spinel oxides, with an additional benefit of being cheap and easy to make [13]. The preparation method and conditions of this spinel ferrite strongly influence the acquired degree of inversion and thus its properties [14][15][16][17][18]. In an investigation of the adsorption of both arsenite (H3AsO3) and arsenate (H3AsO4) on Fe2MnO4, Fe2CoO4 and Fe3O4, Zhang et al synthesised the material via co-precipitation, an effective synthetic approach that permits good control of shape and particle size distribution [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…The preparation method and conditions of this spinel ferrite strongly influence the acquired degree of inversion and thus its properties [14][15][16][17][18]. In an investigation of the adsorption of both arsenite (H3AsO3) and arsenate (H3AsO4) on Fe2MnO4, Fe2CoO4 and Fe3O4, Zhang et al synthesised the material via co-precipitation, an effective synthetic approach that permits good control of shape and particle size distribution [18,19]. It was demonstrated that the maximum adsorption capacities of arsenite and arsenate on Fe2CoO4 were 100 and 74 mg g −1 , respectively, which are higher than those for Fe3O4 (50 and 44 mg g −1 , respectively).…”

Section: Introductionmentioning

confidence: 99%

“…Although there exist experimental studies about the magnetic properties and pollutants adsorption on Fe2CoO4 and its variants [13,[18][19][20], there are no atomistic first-principles studies dedicated to characterising the fundamental adsorption process and complexation of arsenite onto the Fe2CoO4 surface, which makes this study timely. In the present study, we have employed computational approaches based on DFT to characterise the surface structures, compositions, and stabilities of the inverse spinel Fe2CoO4 mineral.…”

Section: Introductionmentioning

confidence: 99%

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First-Principles Density Functional Theory Characterisation of the Adsorption Complexes of H3AsO3 on Cobalt Ferrite (Fe2CoO4) Surfaces

Lewis

Dzade

2021

Minerals

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The mobility of arsenic in aqueous systems can be controlled by its adsorption onto the surfaces of iron oxide minerals such as cobalt ferrite (Fe2CoO4). In this work, the adsorption energies, geometries, and vibrational properties of the most common form of As(III), arsenous acid (H3AsO3), onto the low-index (001), (110), and (111) surfaces of Fe2CoO4 have been investigated under dry and aqueous conditions using periodic density functional theory (DFT) calculations. The dry and hydroxylated surfaces of Fe2CoO4 steadily followed an order of increasing surface energy, and thus decreasing stability, of (001) < (111) < (110). Consequently, the favourability of H3AsO3 adsorption increased in the same order, favouring the least stable (110) surface. However, by analysis of the equilibrium crystal morphologies, this surface is unlikely to occur naturally. The surfaces were demonstrated to be further stabilised by the introduction of H2O/OH species, which coordinate the surface cations, providing a closer match to the bulk coordination of the surface species. The adsorption complexes of H3AsO3 on the hydroxylated Fe2CoO4 surfaces with the inclusion of explicit solvation molecules are found to be generally more stable than on the dry surfaces, demonstrating the importance of hydrogen-bonded interactions. Inner-sphere complexes involving bonds between the surface cations and molecular O atoms were strongly favoured over outer-sphere complexes. On the dry surfaces, deprotonated bidentate binuclear configurations were most thermodynamically favoured, whereas monodentate mononuclear configurations were typically more prevalent on the hydroxylated surfaces. Vibrational frequencies were analysed to ascertain the stabilities of the different adsorption complexes and to assign the As-O and O-H stretching modes of the adsorbed arsenic species. Our results highlight the importance of cobalt as a potential adsorbent for arsenic contaminated water treatment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First-Principles Density Functional Theory Characterisation of the Adsorption Complexes of H3AsO3 on Cobalt Ferrite (Fe2CoO4) Surfaces

Lewis

Dzade

2021

Minerals

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“…Selected ferrites for this study were ferromagnetic materials: NZF, CF and NCuSmZF. NZF as a good soft magnetic and CF as a semi-hard magnetic possess good electrostrictive properties, high electrical resistivity, high value of magnetization and high chemical stability [20,21]. Many reports are available in the literature for Cu-substituted NZF and Sm-substituted NZF.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectric properties of materials based on barium zirconium titanate and various magnetic compounds

Dzunuzovic

Vijatovic-Petrovic

Bobić

et al. 2021

PAC

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Multiferroic composites containing ferroelectric Ba(Ti0.80Zr0.20)O3 (BT80Zr20) phase and magnetic Ni0.7Zn0.3Fe2O4 (NZF), CoFe2O4 (CF) or Ni0.7Cu0.01Sm0.05Zn0.29Fe1.95O4 (NCuSmZF) phase were investigated in this study. Three composites, BT80Zr20-NZF, BT80Zr20-CF and BT80Zr20-NCuSmZF were prepared by mixing chemically synthesized powders in the planetary mill, uniaxial pressing and sintering at 1300?C. X-ray diffraction data for the single phase and composites ceramics indicated the formation of crystallized structure of both ferrites and barium zirconium titanate, without the presence of undesirable phases. Microstructure analysis has shown the formation of two types of nanosized grains, polygonal ferromagnetic andd rounded ferroelectric grains. Non-saturated hysteresis loops were evident in all composite samples possibly due to the presence of very high conductive ferrite phases. The BT80Zr20-CF has shown the lowest conductivity values in comparison with other two compounds and therefore the highest potential for ferroelectric application. The impedance investigations confirmed the presence of different relaxation processes that originate from the grain and grain boundary contributions. Investigation of J-E relation between leakage and electric field for the BT80Zr20 and composites revealed the presence of four possible mechanisms of conduction in these materials.

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“…From the literature data it was observed that the NZF is characterized with high electrical resistivity, chemical stability and good electromagnetic properties while the BT possesses a high permittivity, low dielectric loss and high tunability [15][16][17]. CF, as a semi-hard material, has a good electrostrictive properties, large magnetocrystalline anisotropy, high coercivity, chemical stability and mechanical hardness, while PZT, with morphotropic phase boundary structure has excellent ferroelectric and piezoelectric properties [18,19]. The investigation of the magnetic field impact on dielectric properties of single phase materials and multiferroic composites was carried out.…”

Section: Introductionmentioning

confidence: 99%

Magneto-dielectric properties of ferrites and ferrite/ferroelectric multiferroic composites

Dzunuzovic

Vijatovic-Petrovic

Ilić

et al. 2019

PAC

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Ni-Zn ferrites, with the general formula Ni 1-x Zn x Fe 2 O 4 (x = 0.0, 0.3, 0.5, 0.7, 1.0), CoFe 2 O 4 , BaTiO 3 and PbZr 0.52 Ti 0.48 O 3 powders were synthesized by auto-combustion method. The composites were prepared by mixing the appropriate amounts of individual phases, pressing and conventional sintering. X-ray analysis, for individual phase and composites, indicated the formation of crystallized structure of NiZnFe 2 O 4 , BaTiO 3 and PbZr 0.52 Ti 0.48 O 3 without the presence of secondary phases or any impurities. SEM analyses indicated a formation of uniform grain distribution for ferromagnetic and ferroelectric phases and formation of two types of grains, polygonal and rounded, respectively. Magneto-dielectric effect was exhibited in all samples because of the applied stress occurring due to the piezomagnetic effect and the magnetic field induced the variation of the dielectric constant. For all samples the dielectric constant was higher in applied magnetic field. At the low frequency, the dispersion of dielectric losses appeared, while at the higher frequency the value of tan δ become constant (Maxwell-Wagner relaxation). Investigation of J-E relation between leakage and electric field revealed that both nickel zinc ferrite and composites have three different regions of conduction: region with ohmic conduction mechanism, region with the trap-controlled space charge limited current mechanism and region with space charge limited current mechanism.

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Semi-hard magnetic properties of nanoparticles of cobalt ferrite synthesized by the co-precipitation process

Cited by 66 publications

References 33 publications

First-Principles Density Functional Theory Characterisation of the Adsorption Complexes of H3AsO3 on Cobalt Ferrite (Fe2CoO4) Surfaces

First-Principles Density Functional Theory Characterisation of the Adsorption Complexes of H3AsO3 on Cobalt Ferrite (Fe2CoO4) Surfaces

Magnetoelectric properties of materials based on barium zirconium titanate and various magnetic compounds

Magneto-dielectric properties of ferrites and ferrite/ferroelectric multiferroic composites

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