Use este identificador para citar ou linkar para este item: https://repositorio.ufms.br/handle/123456789/586
Tipo: Artigo de Periódico
Título: Study of the crystal structure of the high Tc superconductor Hg1–xRexBa2Ca2Cu3O8+δ by using EXAFS, XANES and XRD
Autor(es): Gallego Martinez, Luis
Rossi, Jesualdo Luiz
Orlando, Marcos Tadeu D'Azeredo
Passos, Carlos Augusto Cardoso
Corrêa, Hamilton Perez Soares
Abstract: Hg based superconducting ceramics present the highest critical temperatures ever reported, particularly the phase 1223 with the highest Tc so far obtained –135 K. However, these compounds are obtained by a complex synthesis route and suffer degradation at ambient atmosphere. This disadvantage may be overcome by doping with an appropriate amount of Re. Samples of nominal composition Hg0.82Re0.18Ba2Ca2Cu3O8+δ having different oxygen contents were studied by X ray absorption and diffraction techniques. Using XANES we determined the Re valence = +7 in an octahedral distorted coordination. We determined the distances of Re–O bonds (1.85 Å and 2.10 Å) by EXAFS. XRD Rietveld fits showed segregation of two superconducting phases with distinct lattice parameters. The main phase is associated with Hg, Re–1223 with higher oxygen content, and the secondary superconducting phase is related to undoped Hg–1223.
Palavras-chave: Cristalografia por Raios X
Difração de Raios X
Supercondutividade
Crystallography, X-Ray
X-Ray Diffraction
Editor: Materials Research
Citação: MARTINEZ, Luis Gallego et al . Study of the crystal structure of the high Tc superconductor Hg1-xRe xBa2Ca2Cu3O8+δ by using EXAFS, XANES and XRD. Mat. Res., São Carlos, v. 11, n. 2, jun. 2008 . Disponível em <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392008000200004&lng=pt&nrm=iso>. acessos em 18 out. 2011. http://dx.doi.org/10.1590/S1516-14392008000200004.
Tipo de Acesso: Acesso Aberto
Identificador DOI: http://dx.doi.org/10.1590/S1516-14392008000200004
URI: https://repositorio.ufms.br/handle/123456789/586
Data do documento: 2008
Aparece nas coleções:FAENG - Artigos publicados em periódicos

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