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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
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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. |  | REIS, A. A. dos; SILVA, M. A. da; SANTOS, F. C. dos; ALBUQUERQUE FILHO, M. R. de; SILVEIRA, M. C. T. da; TEIXEIRA, E. C.; VASCONCELOS, A. de A.; BORGES, I. D.; SOUZA, W. G. Impacto do sistema de pastejo no estoque de carbono lábil do solo arenoso. In: CONGRESO INTERNACIONAL DE SISTEMAS SILVOPASTORILES, 12.; CONGRESO DE LA RED GLOBAL DE SISTEMAS SILVOPASTORILES, 2.; IV SEMINARIO NACIONAL DE SISTEMAS SILVOPASTORILES, 4., 2023, Montevideo; CONGRESO NACIONAL SISTEMAS SILVOPASTORILES, 5., 2023, Buenos Aires. Sistemas silvopastoriles: hacia una diversificación sostenible. Cali: CIPAV, 2023. p. 842-848.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 2. | | SANTOS, F. C. dos; AKER, A. M.; RESENDE, R. M. S.; RODRIGUES, J. A. S.; MENEZES, C. B. de; GUIMARAES, L. J. M.; PEREIRA, A. F.; DIAS, W. P.; ALBUQUERQUE FILHO, M. R. de; VASCONCELOS, A. de A.; OLIVEIRA, I. C. M.; JULIO, B. H. M. Avaliação preliminar da adaptação de culturas anuais e forrageiras às condições edafoclimáticas do Sul do Oeste baiano. Sete Lagoas: Embrapa Milho e Sorgo, 2019. 32 p. (Embrapa Milho e Sorgo, Documentos, 254).| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 3. | | GRACA, G. A. da; FONTES, P. T. N.; SOARES, A. C.; JESUS, M. S. de; MATOS, P. N.; LEITE NETA, M. T. S.; SIMOES, A. do N.; CARVALHO, L. M. de; OLIVEIRA JUNIOR, L. F. G. de; CARNELOSSI, M. A. G.; VASCONCELOS, A. de A. Characterization of growth and development of pumpkin cv Mini Jack fruits. Food Chemistry Advances, v. 5, 100743, 2024.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 2 |
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