Pressure study of monoclinic ReOsub(2) up to 1.2 GPa using X-ray absorption spectroscopy and X-ray diffraction

FERREIRA, FABIO F.CORREA, HAMILTON P.S.ORLANDO, MARCOS T.D.PASSAMAI JUNIOR, JOSE L.ORLANDO, CINTIA G.P.CAVALCANTE, ISABELA P.GARCIA, FLAVIOTAMURA, EDILSONMARTINEZ, LUIS G.ROSSI, JESUALDO L.MELO, FRANCISCO C.L. de2014-07-152014-07-302014-07-152014-07-302009FERREIRA, FABIO F.; CORREA, HAMILTON P.S.; ORLANDO, MARCOS T.D.; PASSAMAI JUNIOR, JOSE L.; ORLANDO, CINTIA G.P.; CAVALCANTE, ISABELA P.; GARCIA, FLAVIO; TAMURA, EDILSON; MARTINEZ, LUIS G.; ROSSI, JESUALDO L.; MELO, FRANCISCO C.L. de. Pressure study of monoclinic ReOsub(2) up to 1.2 GPa using X-ray absorption spectroscopy and X-ray diffraction. <b>Journal of Synchrotron Radiation</b>, v. 16, p. 48-56, 2009. DOI: <a href="https://dx.doi.org/10.1107/S0909049508036029">10.1107/S0909049508036029</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/4865.0909-0495http://repositorio.ipen.br/handle/123456789/4865The crystal and local atomic structure of monoclinic ReO2 (α-ReO2) under hydrostatic pressure up to 1.2 GPa was investigated for the first time using both X-ray absorption spectroscopy and high-resolution synchrotron X-ray powder diffraction and a home-built B4C anvil pressure cell developed for this purpose. Extended X-ray absorption fine-structure (EXAFS) data analysis at pressures from ambient up to 1.2 GPa indicates that there are two distinct Re—Re distances and a distorted ReO6 octahedron in the α-ReO2 structure. X-ray diffraction analysis at ambient pressure revealed an unambiguous solution for the crystal structure of the α-phase, demonstrating a modulation of the Re—Re distances. The relatively small portion of the diffraction pattern accessed in the pressure-dependent measurements does not allow for a detailed study of the crystal structure of α-ReO2 under pressure. Nonetheless, a shift and reduction in the (011) Bragg peak intensity between 0.4 and 1.2 GPa is observed, with correlation to a decrease in Re—Re distance modulation, as confirmed by EXAFS analysis in the same pressure range. This behavior reveals that α-ReO2 is a possible inner pressure gauge for future experiments up to 1.2 GPa.48-56openAccessrhenium oxidescrystal structuresuperconductorspressure dependencex-ray spectroscopyabsorption spectroscopysynchrotron radiationfine structurex-ray diffractionPressure study of monoclinic ReOsub(2) up to 1.2 GPa using X-ray absorption spectroscopy and X-ray diffractionArtigo de periódico1610.1107/S0909049508036029https://orcid.org/0000-0002-8304-9939https://orcid.org/0000-0001-7707-7821