Influence of Ag on the Magnetic Anisotropy of Fe3O4 Nanocomposites.
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| Title: | Influence of Ag on the Magnetic Anisotropy of Fe |
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| Authors: | Batista de Jesus, Ana Carla1 (AUTHOR) carlabatista.ita@gmail.com, Santos Barbosa, Cristiane Cupertino1 (AUTHOR) criscupertinob@gmail.com, Barreto Peixoto, Erilaine1 (AUTHOR) erilainepeixoto@gmail.com, de Jesus, Jonathas Rafael1 (AUTHOR) jonathasrafael@gmail.com, da Silva Filho, Jorge Luiz2 (AUTHOR) jorgeluizfh@gmail.com, Fabian, Fernanda Antunes3 (AUTHOR) fernandafabianro@gmail.com, Costa, Ivani Meneses4 (AUTHOR) ivanimcosta@gmail.com, dos Santos Duque, José Gerivaldo1,5 (AUTHOR) gerivaldoduque@gmail.com, de Meneses, Cristiano Teles1,5 (AUTHOR) ctmeneses@gmail.com |
| Source: | Journal of Superconductivity & Novel Magnetism. Aug2019, Vol. 32 Issue 8, p2471-2477. 7p. |
| Subjects: | Magnetic anisotropy, Particle analysis, Infrared absorption, Decomposition method, X-ray diffraction measurement, Concentration functions |
| Abstract: | In this work, the thermal decomposition method is used to obtain Fe3O4-Ag nanocomposites. The weight losses observed in the thermogravimetric measurements are used to estimate the amount of organic mass present in the samples. Fourier-transform infrared (FTIR) spectra show characteristic absorption peaks of the stretching vibration of the Fe-O and C-H groups. Samples are characterized structurally and morphologically by measurements of X-ray diffraction (XRD) and transmission electronic microscopy (TEM), respectively. The XRD patterns indicate the formation of a cubic phase with spinel crystallographic structure. Particles sizes analysis estimated by Scherrer's equation for Fe3O4 phase show that sizes are unaffected by the Ag-insertion. TEM images reveal that the nanoparticles have a spherical-like shape and a mean particles sizes ranging 3 < d < 4 nm. The best fits of zero-field-cooling and field-cooling (ZFC/FC) curves allow us to state that the magnetic anisotropy constant decreasing as a function of Ag concentration. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | In this work, the thermal decomposition method is used to obtain Fe3O4-Ag nanocomposites. The weight losses observed in the thermogravimetric measurements are used to estimate the amount of organic mass present in the samples. Fourier-transform infrared (FTIR) spectra show characteristic absorption peaks of the stretching vibration of the Fe-O and C-H groups. Samples are characterized structurally and morphologically by measurements of X-ray diffraction (XRD) and transmission electronic microscopy (TEM), respectively. The XRD patterns indicate the formation of a cubic phase with spinel crystallographic structure. Particles sizes analysis estimated by Scherrer's equation for Fe3O4 phase show that sizes are unaffected by the Ag-insertion. TEM images reveal that the nanoparticles have a spherical-like shape and a mean particles sizes ranging 3 < d < 4 nm. The best fits of zero-field-cooling and field-cooling (ZFC/FC) curves allow us to state that the magnetic anisotropy constant decreasing as a function of Ag concentration. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 15571939 |
| DOI: | 10.1007/s10948-018-4970-7 |
