Assessment of electronic states and local structure of Mn‑atoms in nanometric‑sized La0.7Ca0.3Mn1−xNixO3 manganites by means of X‑ray‑absorption fine structure measurements.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorGómez, Adrián-
Autor(es): dc.creatorChavarriaga Miranda, Edgar Andres-
Autor(es): dc.creatorCoral, Diego Fernando-
Autor(es): dc.creatorBezzon, Vinícius Danilo Nonato-
Autor(es): dc.creatorPham, Yen-
Autor(es): dc.creatorYu, S. C.-
Autor(es): dc.creatorMóran Campaña, Oswaldo-
Data de aceite: dc.date.accessioned2025-08-21T15:33:12Z-
Data de disponibilização: dc.date.available2025-08-21T15:33:12Z-
Data de envio: dc.date.issued2025-01-06-
Data de envio: dc.date.issued2025-01-06-
Data de envio: dc.date.issued2023-
Fonte completa do material: dc.identifierhttps://www.repositorio.ufop.br/handle/123456789/19366-
Fonte completa do material: dc.identifierhttps://link.springer.com/article/10.1007/s00339-023-07177-w-
Fonte completa do material: dc.identifierhttps://doi.org/10.1007/s00339-023-07177-w-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1018142-
Descrição: dc.descriptionSingle-phase, nanosized La0.7Ca0.3Mn1−xNixO3 (x=0, 0.02, 0.07, 0.1) manganites were synthesized via the autocombus tion route. Information on the local geometric structure and the charge state of the Mn ions in the nanosized samples was gleaned from extended X-ray absorption fne structure (EXAFS) and X-ray absorption near edge structure (XANES) data analysis, respectively. The experimental absorption spectra were recorded at room temperature at the K-edge of the Mn-ions. Analysis of the normalized XANES spectra showed that the Mn formal valence remained practically unchanged upon Ni2+ doping. Nevertheless, the observed broadening of the ruling absorption edge suggested that the repulsive nearest-neighbor potential, stemming from the shortening of the distances of Mn to the nearest-neighbor oxygen atoms (Mn–O bonds) in the coordination shell, was slightly modifed. The values of the Mn–O distances were obtained from the Fourier transformed EXAFS spectra. A slight but sizeable decrease in the value of the Mn–O bond distances was verifed, which pointed to a slight variation in the Mn3+/Mn4+ ratio sparked by the Ni2+ doping. Here, a generation of more Mn4+ ions with smaller radius (0.53 Å) was expected. The obtained Mn–O distances were compared with those resulting from the Rietveld refnement of the X-ray powder difraction data. The variation of the 〈Mn–O–Mn〉 bond angle with Ni2+ doping was also determined from the analysis of the X-ray difraction patterns, which allowed visualizing the small distortion of the MnO6 octahedra on substitution of Mn with Ni2+.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectManganites-
Palavras-chave: dc.subjectStructural properties-
Título: dc.titleAssessment of electronic states and local structure of Mn‑atoms in nanometric‑sized La0.7Ca0.3Mn1−xNixO3 manganites by means of X‑ray‑absorption fine structure measurements.-
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