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dc.creatorGallego Martinez, Luis-
dc.creatorRossi, Jesualdo Luiz-
dc.creatorOrlando, Marcos Tadeu D'Azeredo-
dc.creatorPassos, Carlos Augusto Cardoso-
dc.creatorCorrêa, Hamilton Perez Soares-
dc.identifier.citationMARTINEZ, 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 <>. acessos em 18 out. 2011.
dc.description.abstractHg 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.pt_BR
dc.publisherMaterials Researchpt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectCristalografia por Raios Xpt_BR
dc.subjectDifração de Raios Xpt_BR
dc.subjectCrystallography, X-Raypt_BR
dc.subjectX-Ray Diffractionpt_BR
dc.titleStudy of the crystal structure of the high Tc superconductor Hg1–xRexBa2Ca2Cu3O8+δ by using EXAFS, XANES and XRDpt_BR
dc.typeArtigo de Periódicopt_BR
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