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Towards hard-magnetic behavior of CoFe(2)O(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties

We have used the coprecipitation and mechanical-milling methods to fabricate CoFe(2)O(4) nanoparticles with an average crystallite size (d) varying from 81 to ∼12 nm when changing the milling time (t(m)) up to 180 min. X-ray diffraction and Raman-scattering studies have proved the samples crystalizi...

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Autores principales: Manh, D. H., Thanh, T. D., Phan, T. L., Yang, D. S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10009764/
https://www.ncbi.nlm.nih.gov/pubmed/36922942
http://dx.doi.org/10.1039/d3ra00525a
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author Manh, D. H.
Thanh, T. D.
Phan, T. L.
Yang, D. S.
author_facet Manh, D. H.
Thanh, T. D.
Phan, T. L.
Yang, D. S.
author_sort Manh, D. H.
collection PubMed
description We have used the coprecipitation and mechanical-milling methods to fabricate CoFe(2)O(4) nanoparticles with an average crystallite size (d) varying from 81 to ∼12 nm when changing the milling time (t(m)) up to 180 min. X-ray diffraction and Raman-scattering studies have proved the samples crystalizing in the spinel structure. Both the lattice constant and residual strain tend to increase when t(m)(d) increases (decreases). The analysis of magnetization data has revealed a change in the coercivity (H(c)) towards the hard-magnetic properties. Specifically, the maximum H(c) is about 2.2 kOe when t(m) = 10 min corresponding to d ≈ 29 nm; beyond this t(m)(d) value, H(c) gradually decreases. Meanwhile, the increase of t(m) always reduces the saturation magnetization (M(s)) from ∼69 emu g(−1) for t(m) = 0 to 35 emu g(−1) for t(m) = 180 min. The results collected as analyzing X-ray absorption data have indicated a mixed valence state of Fe(2+,3+) and Co(2+) ions. We think that the migration and redistribution of these cations between the tetrahedral and octahedral sites together with lattice distortions and defects induced by the milling process have impacted the magnetic properties of the CoFe(2)O(4) nanoparticles.
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spelling pubmed-100097642023-03-14 Towards hard-magnetic behavior of CoFe(2)O(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties Manh, D. H. Thanh, T. D. Phan, T. L. Yang, D. S. RSC Adv Chemistry We have used the coprecipitation and mechanical-milling methods to fabricate CoFe(2)O(4) nanoparticles with an average crystallite size (d) varying from 81 to ∼12 nm when changing the milling time (t(m)) up to 180 min. X-ray diffraction and Raman-scattering studies have proved the samples crystalizing in the spinel structure. Both the lattice constant and residual strain tend to increase when t(m)(d) increases (decreases). The analysis of magnetization data has revealed a change in the coercivity (H(c)) towards the hard-magnetic properties. Specifically, the maximum H(c) is about 2.2 kOe when t(m) = 10 min corresponding to d ≈ 29 nm; beyond this t(m)(d) value, H(c) gradually decreases. Meanwhile, the increase of t(m) always reduces the saturation magnetization (M(s)) from ∼69 emu g(−1) for t(m) = 0 to 35 emu g(−1) for t(m) = 180 min. The results collected as analyzing X-ray absorption data have indicated a mixed valence state of Fe(2+,3+) and Co(2+) ions. We think that the migration and redistribution of these cations between the tetrahedral and octahedral sites together with lattice distortions and defects induced by the milling process have impacted the magnetic properties of the CoFe(2)O(4) nanoparticles. The Royal Society of Chemistry 2023-03-13 /pmc/articles/PMC10009764/ /pubmed/36922942 http://dx.doi.org/10.1039/d3ra00525a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Manh, D. H.
Thanh, T. D.
Phan, T. L.
Yang, D. S.
Towards hard-magnetic behavior of CoFe(2)O(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties
title Towards hard-magnetic behavior of CoFe(2)O(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties
title_full Towards hard-magnetic behavior of CoFe(2)O(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties
title_fullStr Towards hard-magnetic behavior of CoFe(2)O(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties
title_full_unstemmed Towards hard-magnetic behavior of CoFe(2)O(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties
title_short Towards hard-magnetic behavior of CoFe(2)O(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties
title_sort towards hard-magnetic behavior of cofe(2)o(4) nanoparticles: a detailed study of crystalline and electronic structures, and magnetic properties
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10009764/
https://www.ncbi.nlm.nih.gov/pubmed/36922942
http://dx.doi.org/10.1039/d3ra00525a
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