Particle size effects on structural and optical properties of BaF2 nanoparticles

Andrade, Adriano Borges; Ferreira, Nilson dos Santos; Valerio, Mário Ernesto Giroldo

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Campo DC	Valor	Lengua/Idioma
dc.contributor.author	Andrade, Adriano Borges	-
dc.contributor.author	Ferreira, Nilson dos Santos	-
dc.contributor.author	Valerio, Mário Ernesto Giroldo	-
dc.date.accessioned	2026-07-31T14:37:12Z	-
dc.date.available	2026-07-31T14:37:12Z	-
dc.date.issued	2017	-
dc.identifier.citation	ANDRADE, A. B.; FERREIRA, N. S.; VALERIO, M. E. G. Particle size effects on structural and optical properties of BaF2 nanoparticles. RSC Advances, Cambridge, v. 7, n. 43, p. 26839-26848, 2017. Disponível em: https://pubs.rsc.org/ra/article/7/43/26839/578500/Particle-size-effects-on-structural-and-optical. Acesso em: 31 jul. 2026.	pt_BR
dc.identifier.issn	2046-2069	-
dc.identifier.uri	https://ri.ufs.br/jspui/handle/riufs/25725	-
dc.language	eng	pt_BR
dc.publisher	RSC Publishing	pt_BR
dc.relation.ispartof	RSC Advances	pt_BR
dc.subject	Barium fluoride	eng
dc.subject	Hydrothermal microwave method	eng
dc.subject	Optical properties	eng
dc.title	Particle size effects on structural and optical properties of BaF2 nanoparticles	pt_BR
dc.type	Artigo	pt_BR
dc.identifier.license	Creative Commons Atribuição 3.0 Não Adaptada (CC BY 3.0)	pt_BR
dc.description.resumo	Barium fluoride (BaF2) nanoparticles (NPs) with different sizes were produced through a hydrothermal microwave method (HTMW). The microstructural and electronic properties of the synthesized BaF2 NPs were investigated using X-ray powder diffraction combined with the Rietveld refinement method and Williamson–Hall formalism, X-ray photoemission spectroscopy (XPS) and scanning electron microscopy (SEM). From the Rietveld method, we have found that the lattice parameter of BaF2 NPs is smaller than that observed for BaF2 in its crystal bulk form. These results demonstrated that the lattice parameter shows dependence on size of particle, increasing for larger particles, reducing strain-surface effects. XPS analyses showed that no other elements were present in the material. Photoluminescence (PL) studies in the vacuum ultraviolet (VUV) and visible (VIS) range were also performed to investigate the luminescence properties. The PL results showed a slight shift in the self-trapped exciton (STE) edge for samples with higher particle sizes. In addition, the band gap energy (Eg) was found to be around 10.5 eV for all samples. The observed lattice contraction/expansion was in concordance with the bond-order-length strength (BOLS) correlation mechanism. Therefore, we concluded that this behavior was purely due to surface stress as a result of particle size decreasing.	pt_BR
dc.description.local	Cambridge	pt_BR
dc.identifier.doi	https://doi.org/10.1039/c7ra01582h	-
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