Effects of Ce-Dy rare earths co-doping on various features of Ni-Co spinel ferrite microspheres prepared via hydrothermal approach

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dc.authorid0000-0002-2579-1617
dc.authorid0000-0003-2025-9848
dc.authorid0000-0003-1651-3591
dc.authorscopusid56998718000
dc.authorscopusid7005860623
dc.authorscopusid57105963800
dc.authorscopusid14628517400
dc.authorscopusid6603896825
dc.authorscopusid57202155948
dc.authorscopusid7005225253
dc.authorwosidSlimani, Yassine/E-5054-2017
dc.authorwosidManikandan, A./AAR-1897-2021
dc.authorwosidgungunes, hakan/ABE-1005-2021
dc.authorwosidÜNAL, Bayram/AAH-5254-2019
dc.authorwosidalmessiere, munirah/A-3325-2015
dc.contributor.authorAlmessiere, M. A.
dc.contributor.authorÜnal, B.
dc.contributor.authorSlimani, Y.
dc.contributor.authorGungunes, H.
dc.contributor.authorToprak, M. S.
dc.contributor.authorTashkandi, N.
dc.contributor.authorManikandan, A.
dc.contributor.authorYıldız, A.
dc.date.accessioned2022-05-11T14:37:06Z
dc.date.available2022-05-11T14:37:06Z
dc.date.issued2021
dc.departmentFakülteler, Tıp Fakültesi, Dahili Tıp Bilimleri Bölümü, Adli Tıp Ana Bilim Dalı
dc.description.abstractThe effects of Ce-Dy co-doping on the crystal structure, optical, dielectric, magnetic properties, and hyperfine interactions of Ni-Co spinel ferrite microspheres synthesized hydrothermally have been studied. A series of ferrites with the general formula Ni0.5-Co0.5CexDyxFe2-2xO4 were synthesized with x values ranging from 0.00 to 0.10. The phase, crystallinity, and morphology of ferrite microspheres were analyzed by X-ray powder diffractometry (XRD), scanning and transmission electron microscopes (SEM and TEM), respectively. The structural analyses of the synthesized ferrite microspheres confirmed their high purity and cubic crystalline phase. The Diffuse reflectance spectroscopic (DRS) measurements were presented to calculate direct optical energy band gaps (E-g) and is found in the range 1.63 eV - 1.84 eV. Fe-57 Mossbauer spectroscopy showed that the hyperfine magnetic field of tetrahedral (A) and octahedral (B) sites decreased with the substitution of Dy3+-Ce3+ ions that preferrentially occupy the B site. The impact of the rare-earth content (x) on the magnetic features of the prepared NiCo ferrite microspheres was investigated by analyzing M-H loops, which showed soft ferrimagnetism. The magnetic features illustrate a great impact of the incorporation of Ce3+-Dy3+ ions within the NiCo ferrite structure. The saturation magnetization (M-s), remanence (M-r), and coercivity (H-c) increased gradually with increasing Ce-Dy content. At x = 0.04, M-s, M-r, and H-c attain maximum values of about 31.2 emu/g, 11.5 emu/g, and 512.4 Oe, respectively. The Bohr magneton (n(B)) and magneto-crystalline anisotropy constant (K-eff) were also determined and evaluated with correlation to other magnetic parameters. Further increase in Ce3+-Dy3+ content (i.e., x >= 0.06) was found to decrease M-s, M-r, and H-c values. The variations in magnetic parameters (M-s, M-r, and H-c) were largely caused by the surface spins effect, the variations in crystallite/particle size, the distribution of magnetic ions into the different sublattices, the evolutions of magneto-crystalline anisotropy, and the variations in the magnetic moment (n(B)). The squareness ratios were found to be lower than the predicted theoretical value of 0.5 for various samples, indicating that the prepared Ce-Dy substituted NiCo ferrite microspheres are composed of NPs with single-magnetic domain (SMD). Temperature and frequency-dependent electrical and dielectric measurements have been done to estimate the ac/dc conductivity, dielectric constant, and tangent loss values for all the samples. The ac conductivity measurements confirmed the power-law rules, largely dependent on Ce-Dy content. Impedance analysis stated that the conduction mechanisms in all samples are mainly due to the grains-grain boundaries. The dielectric constant of NiCo ferrite microspheres give rise to normal dielectric distribution, with the frequency depending strongly on the Ce-Dy content. The observed variation in tangential loss with frequency can be attributed to the conduction mechanism in ferrites, like Koop's phenomenological model. (C) 2021 The Author(s). Published by Elsevier B.V.
dc.description.sponsorshipDeanship for Scientific Research of Imam Abdulrahman Bin Faisal University [2020-164-IRMC]
dc.description.sponsorshipThe authors acknowledge the financial supports provided by the Deanship for Scientific Research of Imam Abdulrahman Bin Faisal University (Project application No. 2020-164-IRMC) .
dc.identifier.doi10.1016/j.jmrt.2021.07.142
dc.identifier.endpage2553
dc.identifier.issn2238-7854
dc.identifier.issn2214-0697
dc.identifier.scopus2-s2.0-85112331089
dc.identifier.scopusqualityQ1
dc.identifier.startpage2534
dc.identifier.urihttps://doi.org/10.1016/j.jmrt.2021.07.142
dc.identifier.urihttps://hdl.handle.net/20.500.11776/8569
dc.identifier.volume14
dc.identifier.wosWOS:000702874100011
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorYıldız, A.
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofJournal of Materials Research and Technology-Jmr&T
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectNiCo spinel ferrites
dc.subjectFerrite microsphere
dc.subjectDielectric properties
dc.subjectConductivity
dc.subjectHyperfine interaction
dc.subjectFerrimagnetic
dc.subjectMagnetic-Properties
dc.subjectMagnetooptical Properties
dc.subjectHollow Microspheres
dc.subjectNife2o4 Nanoparticles
dc.subjectOptical-Properties
dc.subjectCofe2o4
dc.subjectSubstitution
dc.subjectPowders
dc.subjectSpheres
dc.subjectMetals
dc.titleEffects of Ce-Dy rare earths co-doping on various features of Ni-Co spinel ferrite microspheres prepared via hydrothermal approach
dc.typeArticle

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