Structure, microstructure and magnetic investigation of the hexagonal d-FeSe nanophase produced by mechanochemical synthesis
dc.contributor.author | Ulbrich, K. F. | pt_BR |
dc.contributor.author | Paes, Vagner Zeizer Carvalho | pt_BR |
dc.contributor.author | Geshev, Julian Penkov | pt_BR |
dc.contributor.author | Campos, Carlos Eduardo Maduro de | pt_BR |
dc.date.accessioned | 2021-02-10T04:13:48Z | pt_BR |
dc.date.issued | 2020 | pt_BR |
dc.identifier.issn | 2046-2069 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/217853 | pt_BR |
dc.description.abstract | We present a systematic structural, microstructural and magnetic characterization of the hexagonal d-FeSe nanophase produced by a simple one-step mechanochemical synthesis route, by using conventional X-ray powder diffraction (XRPD), Rietveld refinement, transmission electron microscopy (TEM) and magnetometry techniques. We observed the simultaneous formation of tetragonal b-FeSe and d-FeSe after 3 h of milling (with minor amounts of unreacted iron), followed by complete b-FeSe / d-FeSe phase transition as milling time increases to 6 h (no unreacted iron). The average crystallite size of the dFeSe phase of about 16 nm after 3 h milling time decreases by about 31% up to the final milling time (24 h). TEM images and electron diffraction patterns confirm the nanometric size of the crystalline domains in the irregularly-shaped agglomerated particles. Two ferromagnetic phases with distinct coercivity spectra were assumed here by considering an assembly of randomly-oriented weakly-anisotropic ferromagnetic particles, mixed at a 4 to 6 volume ratio with other randomly-oriented ferromagnetic grains. Four years after synthesis, the aged samples milled for less than 9 h revealed a certain amount of the b-FeSe phase that slightly affects the d-FeSe (micro)structure but causes some variations (decreasing) in magnetic parameters. Milling times as long as 12 h were shown to be necessary to guarantee the d-FeSe nanophase stability and to retain its magnetic properties over time. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | RSC Advances. Cambridge. Vol. 10, no. 65 (2020), p. 39406-39412 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Método de Rietveld | pt_BR |
dc.subject | Difração de raios X | pt_BR |
dc.subject | Magnetometria | pt_BR |
dc.subject | Nanopartículas magnéticas | pt_BR |
dc.title | Structure, microstructure and magnetic investigation of the hexagonal d-FeSe nanophase produced by mechanochemical synthesis | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001120620 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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