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

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...

ver descrição completa

Na minha lista:
Detalhes bibliográficos
Principais autores: Cava, Sérgio, Tebcherania, Sérgio Mazurek, Pianaroa, Sidnei Antônio, Paskocimas, Carlos Alberto, Silva, Elson Longo da, Varela, José A.
Formato: article
Idioma:English
Publicado em: Elsevier
Assuntos:
Al2O3
CoAl2O4
Phase transition
Synthesis
Pigments
Endereço do item:https://repositorio.ufrn.br/handle/123456789/32279
Tags: Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
id ri-123456789-32279
record_format dspace
spelling ri-123456789-322792022-01-12T15:15:04Z 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. Al2O3 CoAl2O4 Phase transition Synthesis Pigments 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 2021-04-19T18:35:07Z 2021-04-19T18:35:07Z 2005-07-25 article 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. 0254-0584 https://repositorio.ufrn.br/handle/123456789/32279 10.1016/j.matchemphys.2005.07.057 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic Al2O3
CoAl2O4
Phase transition
Synthesis
Pigments
spellingShingle Al2O3
CoAl2O4
Phase transition
Synthesis
Pigments
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
description 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
format article
author Cava, Sérgio
Tebcherania, Sérgio Mazurek
Pianaroa, Sidnei Antônio
Paskocimas, Carlos Alberto
Silva, Elson Longo da
Varela, José A.
author_facet Cava, Sérgio
Tebcherania, Sérgio Mazurek
Pianaroa, Sidnei Antônio
Paskocimas, Carlos Alberto
Silva, Elson Longo da
Varela, José A.
author_sort Cava, Sérgio
title Structural and spectroscopic analysis of y-Al2O3 to α-Al2O3-CoAl2O4 phase transition
title_short Structural and spectroscopic analysis of y-Al2O3 to α-Al2O3-CoAl2O4 phase transition
title_full Structural and spectroscopic analysis of y-Al2O3 to α-Al2O3-CoAl2O4 phase transition
title_fullStr Structural and spectroscopic analysis of y-Al2O3 to α-Al2O3-CoAl2O4 phase transition
title_full_unstemmed Structural and spectroscopic analysis of y-Al2O3 to α-Al2O3-CoAl2O4 phase transition
title_sort structural and spectroscopic analysis of y-al2o3 to α-al2o3-coal2o4 phase transition
publisher Elsevier
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/32279
work_keys_str_mv AT cavasergio structuralandspectroscopicanalysisofyal2o3toaal2o3coal2o4phasetransition
AT tebcheraniasergiomazurek structuralandspectroscopicanalysisofyal2o3toaal2o3coal2o4phasetransition
AT pianaroasidneiantonio structuralandspectroscopicanalysisofyal2o3toaal2o3coal2o4phasetransition
AT paskocimascarlosalberto structuralandspectroscopicanalysisofyal2o3toaal2o3coal2o4phasetransition
AT silvaelsonlongoda structuralandspectroscopicanalysisofyal2o3toaal2o3coal2o4phasetransition
AT varelajosea structuralandspectroscopicanalysisofyal2o3toaal2o3coal2o4phasetransition
_version_ 1773957612761513984

Registros relacionados