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High-pressure study of the behavior of mineral barite by x-ray diffraction

DOI: 10.1103/PhysRevB.84.054102 DOI Help

Authors: D. Santamaria-Perez (University Complutense of Madrid) , L. Gracia (Universitat Jaume I) , G. Garbarino (European Synchrotron Radiation Facility) , A. Beltrán (Universitat Jaume I) , R. Chuliá-Jordán (Universidad Complutense de Madrid) , O. Gomis (Universidad Politécnica de Valencia) , D. Errandonea (Universidad de Valencia) , Ch. Ferrer-Roca (Universidad de Valencia) , D. Martínez-García (Universidad de Valencia) , A. Segura (Universidad de Valencia)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 84 (5)

State: Published (Approved)
Published: August 2011
Diamond Proposal Number(s): 3652

Abstract: 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.

Subject Areas: Physics, Materials, Earth Science

Instruments: I15-Extreme Conditions

Other Facilities: ID27 at ESRF

Added On: 11/08/2011 11:27

Discipline Tags:

Earth Sciences & Environment Mineralogy Physics Materials Science Geology

Technical Tags:

Diffraction High-Pressure X-ray Diffraction (HP-XRD)