Caracterização morfológica e microestrutural da perovskita BaCexPr1-xO3 sintetizada a partir do método de complexação combinando EDTA/Citrato
In this study, binary perovskite (BaCexO3) were doped with praseodymium (Pr) to obtainment of the ternary material BaCexPr1-xO3. This material was synthesized by the complexation method combining EDTA/Citrate with the stoichiometric ratio of the element Praseodymium ranging from x = 0.1 to x = 0.9 i...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15806 |
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| Resumo: | In this study, binary perovskite (BaCexO3) were doped with praseodymium (Pr) to obtainment
of the ternary material BaCexPr1-xO3. This material was synthesized by the complexation
method combining EDTA/Citrate with the stoichiometric ratio of the element Praseodymium
ranging from x = 0.1 to x = 0.9 in order to determine the influence of this rare earth element
on the morphology and microstructure of the final powder. At first the material was
synthesized based on the route proposed by literature (Santos, 2010), and then characterized
by SEM and XRD, besides being refined by the Rietveld method. In the material that had
lowest residual parameter, S, and lowest average size of crystal, pH variation of synthesis
solution was made in order to identify the influence of this parameter on the morphology and
microscopy of the final powder. The results show that addition of praseodymium did not
directly influence the crystallographic and lattice parameters, keeping even the same
orthorhombic structure of the binary material BaCexO3, according to Yamanaka et al (2003).
Material type BaCe0,2Pr0,8O3 had lowest residual parameter (S=1.4) and lowest average size of
crystallite (26.4 nm), being used as reference in the pH variation of synthesis solution for 9,
7, 5 and 3, respectively. Variation of this parameter showed that when the synthesis solution
pH was decreased to below 11, there was an increase in the average size of crystals, for pH 9,
about 58.3%, for pH 7 (30.3 %), for pH 2 (2.3%) and for pH 3 (42%), indicating that the
value initially used and quoted by Santos (2010) was the most coherent |
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