Cation distribution of ZnxCo1-xFe2O4 nanoparticles: a resonant X-ray diffraction study

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dc.creatorNakagomi, Fábio
dc.creatorSouza, Paulo Eduardo Narcizo de
dc.creatorCastro, Tiago de Jesus e
dc.creatorGarg, Vijayendra Kumar
dc.creatorOliveira, Aderbal Carlos de
dc.creatorSilva, F. C. e
dc.creatorFranco Júnior, Adolfo
dc.creatorMorais, Paulo Cesar de
dc.creatorSilva , Sebastiao William da
dc.date.accessioned2023-10-30T13:18:30Z
dc.date.available2023-10-30T13:18:30Z
dc.date.issued2020
dc.description.abstractIn this study, it was successfully explored the use of resonant X-ray diffraction, with energies tuned to the absorption edges of Zn2þ, Fe3þ and Co2þ, as an innovative approach to obtain the structural properties of the as-synthesized ZnxCo1-xFe2O4 nanoparticles (NPs) (0.0 x 1.0). Zinc-cobalt ferrite, which has potential application in magnetic recording, photo-magnetic devices, biomedicine, gas sensing, catalysis, etc., was synthesized by solution combustion method and analysed by X-ray diffraction, Raman and Mossbauer spectroscopies. Rietveld re € finement shows that all samples present single-phase cubic spinel structure (space group Fd3m) with lattice parameter increasing linearly with the Zn-content (x), from 8.37 Å to 8.43 Å. The data also showed that the average diameter of the crystallites sets around 45 nm and do not depend on the Zn-content. In addition, a complete cationic distribution between A- and Bsublatices was obtained by resonant X-ray diffraction and compared with the partial cationic distribution obtained by Raman and Mossbauer spectroscopies. A strong correlation between the data was found. € Despite evidences of the presence of Fe3þ-ions in both crystallographic sites, it was found that as the Zncontent increases, Zn2þ-ions tend to preferentially occupy A-sites, forcing Fe3þ-ions to occupy B-sites. As results, it was observed that with increasing Zn-content, the average distance between cations and anions increases in A-sites (from 1.88 Å to 1.98 Å) and decreases in B-sites (from 2.06 Å to 2.03 Å). Resonant X-ray diffraction and Mossbauer data indicate that the replacement of Co € 2þ- by Zn2þ-ions changes substantially the NPs’ hyperfine parameters, suggesting that the NPs with intermediate Zncontent present lower crystalline quality while compared to the samples with x ¼ 0.0 and x ¼ 1.0. Evidence of symmetry reduction (from m3m to 3m) in the B-sites was obtained, which is in accordance with the variation verified in the integrated areas and energies found for the Raman modes below 600 cm1 . Finally, the excellent agreement between the results obtained by resonant X-ray diffraction, Raman spectroscopy and Mossbauer spectroscopy indicate the robustness of the approach herein used to € assess the cation distribution in quaternary spinel ferrites.
dc.identifier.citationNAKAGOMI, F. et al. Cation distribution of Zn Co1-Fe2O4 nanoparticles: a resonant X-ray diffraction study. Journal of Alloys and Compounds, Amsterdam, v. 842, e155751, 2020. DOI: 10.1016/j.jallcom.2020.155751. Disponível em: https://www.sciencedirect.com/science/article/pii/S0925838820321150. Acesso em: 4 set. 2023.
dc.identifier.doi10.1016/j.jallcom.2020.155751
dc.identifier.issn0925-8388
dc.identifier.issne- 1873-4669
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0925838820321150
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectZinc-cobalt ferrite
dc.subjectMagnetic nanoparticles
dc.subjectResonant X-ray diffraction
dc.subjectRaman spectroscopy
dc.subjectMossbauer spectroscopy
dc.titleCation distribution of ZnxCo1-xFe2O4 nanoparticles: a resonant X-ray diffraction study
dc.typeArtigo

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