Detalhes bibliográficos
| Ano de defesa: |
2017 |
| Autor(a) principal: |
Stelle, Flávia Emilena
 |
| Orientador(a): |
Tebcherani, Sérgio Mazurek
|
| Banca de defesa: |
Kubaski, Evaldo Toniolo
,
Pianaro, Sidnei Antonio
,
Sequinel, Thiago |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
UNIVERSIDADE ESTADUAL DE PONTA GROSSA
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Engenharia e Ciências de Materiais
|
| Departamento: |
Desenvolvimento e Caracterização de Materiais
|
| País: |
BR
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://tede2.uepg.br/jspui/handle/prefix/1483
|
Resumo: |
In this work a study was accomplished about the synthesis of ceramic pigments based on Al2O3 doped with cobalt ions. This oxide system in the form of powder was heat treated pressure-assisted to investigate the possible structural modifications. Cobalt acetate tetrahydrate and aluminum nitrate nonahydrate were used as salt precursors, followed by calcining at temperatures ranging from 700 ° C to 1100 ° C and subsequent heat treatment pressure-assisted of 2 MPa at 120 ° C for 48 hours. The pigments obtained were characterized by X-ray diffraction (XRD), Rietveld refinements, analysis of specific surface area (BET), field emission scanning electron microscopy (FEG-SEM), Raman spectroscopy, spectroscopy in the UV-visible, X-ray photoelectron spectroscopy (XPS), colorimetry and Photoluminescence spectroscopy. The obtained results through the techniques used in this work were in agreement with each other, contributed to a complete characterization of crystalline structure, surface morphology and optical properties. It was possible to compare the responses of the material when subjected to heat treatment pressure-assisted and when not subjected to this treatment. The formation of -Al2O3, CoAl2O4 e -Al2O3 phases were confirmed by Rietveld and X-ray. The UV-vis spectra presented three bands attributed to the Co+2 in tetrahedral sites. The samples showed maximum PL emission in the region of 2,7 eV. Optical properties of pigments showed a band gap in the range of 1,8 eV attributed to the CoAl2O4.The system was suitable for using the material as an ceramic pigment. |
