Structural and spectroscopic analysis of y-Al2O3 to α-Al2O3-CoAl2O4 phase transition

Cava, Sérgio; Tebcherania, Sérgio Mazurek; Pianaroa, Sidnei Antônio; Paskocimas, Carlos Alberto; Silva, Elson Longo da; Varela, José A.

Structural and spectroscopic analysis of y-Al2O3 to α-Al2O3-CoAl2O4 phase transition

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dc.contributor.author	Cava, Sérgio
dc.contributor.author	Tebcherania, Sérgio Mazurek
dc.contributor.author	Pianaroa, Sidnei Antônio
dc.contributor.author	Paskocimas, Carlos Alberto
dc.contributor.author	Silva, Elson Longo da
dc.contributor.author	Varela, José A.
dc.date.accessioned	2021-04-19T18:35:07Z
dc.date.available	2021-04-19T18:35:07Z
dc.date.issued	2005-07-25
dc.description.resumo	Co-doped alumina powders were synthesized by means of the polymeric precursor method to obtain ceramic pigments. The effect of different contents of Co2+ on phase transition to -Al2O3 and appearing of CoAl2O4 spinel were studied by means of X-ray diffraction. A partial phase diagram of the system CoAl2O3 was proposed from these data by means of determination of the percentages of these phases according to the calcining temperature. Critical particle size to phase transition was determined by means of calculations of crystallite size and determination of superficial area through the BET method. UV–vis spectroscopy of the samples allow to compare the band shift with the phase transition. Besides, a study of thermal stability and intensity of the blue coloration of the synthesized powders with the presence of cobalt in relation to the calcining temperature was accomplished and compared to the phase transition. The results show that the higher blue color intensity was obtained for the powders with Co-doped -Al2O3 closest of phase transition to -Al2O3 + CoAl2O4	pt_BR
dc.identifier.citation	CAVA, S.; TEBCHERANI, S.M.; PIANARO, S.A.; PASKOCIMAS, C.A.; LONGO, E.; VARELA, J.A.. Structural and spectroscopic analysis of -Al2O3 to -Al2O3-CoAl2O4 phase transition. Materials Chemistry and Physics, [S.L.], v. 97, n. 1, p. 102-108, maio 2006. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0254058405005080?via%3Dihub. Acesso em: 18 mar. 2021. http://dx.doi.org/10.1016/j.matchemphys.2005.07.057.	pt_BR
dc.identifier.doi	10.1016/j.matchemphys.2005.07.057
dc.identifier.issn	0254-0584
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/32279
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	Al2O3	pt_BR
dc.subject	CoAl2O4	pt_BR
dc.subject	Phase transition	pt_BR
dc.subject	Synthesis	pt_BR
dc.subject	Pigments	pt_BR
dc.title	Structural and spectroscopic analysis of y-Al2O3 to α-Al2O3-CoAl2O4 phase transition	pt_BR
dc.type	article	pt_BR