The role of the Eu3+ ions in structure and photoluminescence properties of SrBi2Nb2O9 powders

Volanti, Diogo Paschoalini; Rosa, Ieda Lúcia Viana; Paris, Elaine Cristina; Paskocimas, Carlos Alberto; Pizani, Paulo Sérgio; Varela, José A.; Silva, Elson Longo da

The role of the Eu3+ ions in structure and photoluminescence properties of SrBi2Nb2O9 powders

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dc.contributor.author	Volanti, Diogo Paschoalini
dc.contributor.author	Rosa, Ieda Lúcia Viana
dc.contributor.author	Paris, Elaine Cristina
dc.contributor.author	Paskocimas, Carlos Alberto
dc.contributor.author	Pizani, Paulo Sérgio
dc.contributor.author	Varela, José A.
dc.contributor.author	Silva, Elson Longo da
dc.date.accessioned	2021-04-07T14:29:59Z
dc.date.available	2021-04-07T14:29:59Z
dc.date.issued	2009-04
dc.description.resumo	This work rationalized for the first time the key role of Eu3+ ion in the doping process of SrBi2Nb2O9 (SBN) compound. This process allows us to understand the role of Eu3+ as lattice modifier as well as to obtain information on the crystalline structure surrounding. Therefore, the SBN and Eu3+ doped SBN (SBN:Eu) were synthesized using the polymeric precursor method (PPM). Scanning electron microscope (SEM) images reveal the strong influence of europium on the SBN microstructure. Thermogravimetry (TG) and differential thermal analysis (DTA) techniques were used to determine the weight loss and changes associated with phase transitions in SBN during thermal evolution. The behavior of the Eu3+ lattice modifier was followed in a long-range order by X-ray diffraction (XRD), while Fourier transform Raman (FTRaman) spectroscopy was used to analyze the short-range order. To this end, the SBN orthorhombic phase was observed for all samples heat treated from 400 to 700 C for 2 h. In addition, photoluminescence measurements were employed to study the structural modifications in SBN lattice. The characteristic red emission of the Eu3+ using the 488 nm exciting wavelength of an argon–ion laser was distinctly observed for SBN:Eu samples heat treated from 550 to 700 C. Europium characteristic emission bands are related to 5D1?7FJ (J = 0–2) transitions at 538 and 555 nm, as well as the 5D0?7FJ (J = 0–4) ones at 580, 592, 615, 653 and 695 nm. By means of the emission spectra analyses it was possible to predict that the Eu3+ ions are located at sites of higher symmetry, since the relative area of the (5D0?7F2)/ (5D0?7F1) transitions for the SBN:Eu samples decrease from 3.82 to 2.60 with increasing temperature from 550 to 700 °C	pt_BR
dc.identifier.citation	VOLANTI, Diogo P.; ROSA, Ieda L.V.; PARIS, Elaine C.; PASKOCIMAS, Carlos A.; PIZANI, Paulo S.; VARELA, José A.; LONGO, Elson. The role of the Eu3+ ions in structure and photoluminescence properties of SrBi2Nb2O9 powders. Optical Materials, v. 31, p. 995-999, 2009. Disponível: https://www.sciencedirect.com/science/article/abs/pii/S0925346708002863?via%3Dihub Acesso: 11 fev. 2021. https://doi.org/10.1016/j.optmat.2008.11.006	pt_BR
dc.identifier.doi	10.1016/j.optmat.2008.11.006
dc.identifier.issn	0925-3467
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/32074
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Photoluminescence	pt_BR
dc.subject	Strontium bismuth niobate	pt_BR
dc.subject	Europium	pt_BR
dc.subject	Polymeric precursor method	pt_BR
dc.title	The role of the Eu3+ ions in structure and photoluminescence properties of SrBi2Nb2O9 powders	pt_BR
dc.type	article	pt_BR