NDLI: Pressure study of monoclinic ReO2 up to 1.2 GPa using X-ray absorption spectroscopy and X-ray diffraction.

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Pressure study of monoclinic ReO2 up to 1.2 GPa using X-ray absorption spectroscopy and X-ray diffraction.

Content Provider	Semantic Scholar
Author	Ferreira, Fabio Furlan Correa, H. S. P. Orlando, Marcos T. D. Passamai, José L. Orlando, Cíntia G. P. Cavalcante, Isabela P. García, Flávio Tamura, Edilson Martínez, L. Rossi, Jesualdo L. Melo, Francisco C. L. De
Copyright Year	2009
Abstract	The crystal and local atomic structure of monoclinic ReO2 (alpha-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 alpha-ReO2 structure. X-ray diffraction analysis at ambient pressure revealed an unambiguous solution for the crystal structure of the alpha-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 alpha-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 alpha-ReO2 is a possible inner pressure gauge for future experiments up to 1.2 GPa.
Starting Page	48
Ending Page	56
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1107/S0909049508036029
PubMed reference number	19096174
Journal	Medline
Volume Number	16
Part	1
Alternate Webpage(s)	http://journals.iucr.org/s/issues/2009/01/00/wa5006/wa5006.pdf
Alternate Webpage(s)	https://doi.org/10.1107/S0909049508036029
Journal	Journal of synchrotron radiation
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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