High-pressure study of the behavior of mineral barite by x-ray diffraction
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Otros documentos de la autoría: Santamaría Pérez, D.; Gracia, Lourdes; Garbarino, G.; Beltran, Armando; Chulia-Jordan, Raquel; Gomis Hilario, Óscar; Errandonea, Daniel; Ferrer Roca, Chantal María; Martínez García, Domingo; Segura García del Río, Alfredo
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
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Título
High-pressure study of the behavior of mineral barite by x-ray diffractionAutoría
Fecha de publicación
2011-08-02Editor
American Physical SocietyISSN
1098-0121; 1550-235XCita bibliográfica
Physical Review B (2011) vol. 84, no. 5Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://link.aps.org/doi/10.1103/PhysRevB.84.054102Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
In this paper, we report the angle-dispersive x-ray diffraction data of barite, BaSO4 , measured in a diamond-anvil cell up to a pressure of 48 GPa, using three different fluid pressure-transmitting media (methanol- ... [+]
In this paper, we report the angle-dispersive x-ray diffraction data of barite, BaSO4 , measured in a diamond-anvil cell up to a pressure of 48 GPa, using three different fluid pressure-transmitting media (methanol-ethanol mixture, silicone oil, and He). Our results show that BaSO4 exhibits a phase transition at pressures that range from 15 to 27 GPa, depending on the pressure media used. This indicates that nonhydrostatic stresses have a crucial role in the high-pressure behavior of this compound. The new high-pressure (HP) phase has been solved and refined from powder data, having an orthorhombic P212121 structure. The pressure dependence of the structural parameters of both room- and HP phases of BaSO4 is also discussed in light of our theoretical first-principles total-energy calculations. Finally, a comparison between the different equations of state obtained in our experiments is reported. [-]
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