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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
20/09/2021 |
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Data da última atualização: |
10/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CARDENAS-FLECHAS, L. J.; FREIRE, P. T. C.; PARIS, E. C. |
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Afiliação: |
ELAINE CRISTINA PARIS, CNPDIA. |
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Título: |
Temperature-induced structural phase transformation in samples of Co3O4 and Co3-xNixO4 for CoO. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Materialia, v. 18, 101155, 2021. |
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Páginas: |
1 - 10 |
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ISSN: |
2589-1529 |
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DOI: |
https://doi.org/10.1016/j.mtla.2021.101155 |
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Idioma: |
Inglês |
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Conteúdo: |
Undoped and Ni-doped cobalt oxide (Ni=4%) powders were prepared by hydrothermal synthesis and subsequently examined. The powders obtained were subjected to thermal annealing at temperatures ranging between 600 °C and 1000 °C. The experimental results indicate that the annealing affects the structural properties with the phase change Co3O4 to CoO. X-Ray diffraction (XRD) analysis reveals the presence of pure spinel phase up to 800 °C in powders obtained with and without the addition of nickel. From 900 °C, the CoO phase was observed. Rietveld refinement was conducted with main GOF values between 1.09 and 1.26 and also x2 values between 1.28 and 1.57, indicating a good correspondence between the simulated and the experimental pattern. In addition, SEM measurements evidenced that particle size increased with temperature; however, samples doped with Ni exhibited a slightly smaller size compared to pure samples. The synthesized powders showed shifted and broad bands Raman, with increasing temperature, mainly for doped samples. These changes in the position of Raman vibrational modes are related to defects and distortions in the crystal lattice of the material as a result of the increase in temperature and the addition of Ni. Furthermore, such changes may also indicate loss of crystallinity in the material, or the beginning of the phase chang |
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Palavras-Chave: |
Co3O4; Hydrothermal; Structural phase transformation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02020naa a2200217 a 4500
001 2134579
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008 2021 bl uuuu u00u1 u #d
022 $a2589-1529
024 7 $ahttps://doi.org/10.1016/j.mtla.2021.101155$2DOI
100 1 $aCARDENAS-FLECHAS, L. J.
245 $aTemperature-induced structural phase transformation in samples of Co3O4 and Co3-xNixO4 for CoO.$h[electronic resource]
260 $c2021
300 $a1 - 10
520 $aUndoped and Ni-doped cobalt oxide (Ni=4%) powders were prepared by hydrothermal synthesis and subsequently examined. The powders obtained were subjected to thermal annealing at temperatures ranging between 600 °C and 1000 °C. The experimental results indicate that the annealing affects the structural properties with the phase change Co3O4 to CoO. X-Ray diffraction (XRD) analysis reveals the presence of pure spinel phase up to 800 °C in powders obtained with and without the addition of nickel. From 900 °C, the CoO phase was observed. Rietveld refinement was conducted with main GOF values between 1.09 and 1.26 and also x2 values between 1.28 and 1.57, indicating a good correspondence between the simulated and the experimental pattern. In addition, SEM measurements evidenced that particle size increased with temperature; however, samples doped with Ni exhibited a slightly smaller size compared to pure samples. The synthesized powders showed shifted and broad bands Raman, with increasing temperature, mainly for doped samples. These changes in the position of Raman vibrational modes are related to defects and distortions in the crystal lattice of the material as a result of the increase in temperature and the addition of Ni. Furthermore, such changes may also indicate loss of crystallinity in the material, or the beginning of the phase chang
653 $aCo3O4
653 $aHydrothermal
653 $aStructural phase transformation
700 1 $aFREIRE, P. T. C.
700 1 $aPARIS, E. C.
773 $tMaterialia$gv. 18, 101155, 2021.
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Embrapa Instrumentação (CNPDIA) |
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| 1. |  | MAULVAULT, A.; CAMACHO, C.; SAMPAIO, E.; BARBOSA, V.; ALVES, R.; FOGACA, F. H. dos S.; KWADIJK, C.; KOTTERMAN, M.; SLOTH, J.; RASMUSSEN, R. R.; ELJARRAT, E.; AZNAR-ALEMANY, Ò.; CUNHA, S. Can seafood safety be compromised in the ocean of tomorrow? In: SEAFOOD SAFETY NEW FINDINGS & INNOVATION CHALLENGES. Abstract book. Brussels, Belgium: Royal Flemish Academy of Science and the Arts (KVAB), 2017. p. 24. Autoria na publicação: FABIOLA FOGAÇA.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio-Norte. |
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| 2. | | MAULVAULT, A. L.; CAMACHO, C.; BARBOSA, V.; ALVES, R.; ANACLETO, P.; FOGACA, F. H. dos S.; KWADIJK, C.; KOTTERMAN, M.; CUNHA, S. C.; FERNANDES, J. O.; RASMUSSEN, R. R.; SLOTH, J. J.; AZNAR-ALEMANY, O. A.; ELJARRAT, E.; BARCELÓ, D.; MARQUES, A. Assessing the effects of seawater temperature and pH on the bioaccumulation of emerging chemical contaminants in marine bivalves. Environmental Research, v. 161, p. 236-247, 2018. Autoria na publicação: Fabíola Fogaça.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Meio-Norte. |
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| 3. | | MAULVAULT, A. L.; CAMACHO, C.; BARBOSA, V.; ALVES, R.; ANACLETO, P.; FOGACA, F. H. dos S.; KWADIJK, C.; KOTTERMAN, M.; CUNHA, S. C.; FERNANDES, J. O.; RASMUSSEN, R. R.; SLOTH, J. J.; AZNAR-ALEMANY, O. A.; ELJARRAT, E.; BARCELÓ, D.; MARQUES, A. Assessing the effects of seawater temperature and pH on the bioaccumulation of emerging chemical contaminants in marine bivalves. Environmental Research, v. 161, p. 236-247, 2018. Autoria na publicação: Fabíola Fogaça.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Agroindústria de Alimentos. |
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| 4. | | ALVES, R. N.; MAULVAULT, A. L.; BARBOSA, V. L.; FERNANDEZ-TEJEDOR, M.; RAMBLA-ALEGRE, M.; CAMPÀS, M.; REVERTÉ, L.; DIOGÈNE, J.; TEDIOSIE, A.; KWADIJK, C. J. A. F.; KOTTERMAN, M.; VAN DEN HEUVEL, F. H. M.; ROBBENS, J.; CUNHA, S.; FERNANDES, J. O.; RASMUSSEN, R. R.; SLOTH, J. J.; ALVAREZ-MUÑOZ, D.; RODRÍGUEZ-MOZAZ, S.; AZNAR-ALEMANY, Ò.; ELJARRAT, E.; BARCELÓ, D.; MANITA, D.; BRAGA, A. C.; FOGACA, F. H. dos S.; COSTA, P. R.; MARQUES, A. Bioaccessibility of contaminants of emerging concern in raw and cooked commercial seafood species: insights for food safety risk assessment. In: SEAFOOD SAFETY NEW FINDINGS & INNOVATION CHALLENGES. Abstract book. Brussels, Belgium: Royal Flemish Academy of Science and the Arts (KVAB), 2017. p. 14. Autoria na publicação: FABIOLA FOGAÇA.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio-Norte. |
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| Registros recuperados : 4 | |
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