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International Union of Crystallography, Journal of Synchrotron Radiation, 5(12), p. 577-583, 2005

DOI: 10.1107/s0909049505022326

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Single-crystal synchrotron X-ray diffraction study of wustite and magnesiowustite at lower-mantle pressures

Journal article published in 2005 by Steven D. Jacobsen ORCID, Jung-Fu Lin, Ross J. Angel, Guoyin Shen ORCID, Vitali B. Prakapenka, Przemyslaw Dera, Ho-Kwang Mao, Russell J. Hemley
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

This study demonstrates the use of monochromatic synchrotron X-ray radiation of 40 keV for high-precision equation-of-state studies on sets of single crystals analysed individually in the same diamond-anvil pressure cell. Angle-dispersive zone-axis diffraction patterns were obtained from crystals of wustite-Fe0.93O and magnesiowüstite-(Mg0.73Fe0.27)O to 51 GPa in a hydrostatic helium pressure medium. The rhombohedral phase of Fe0.93O was observed above 23 GPa, and its isothermal bulk modulus (K0) was determined to be 134 (+/-4) GPa, assuming K'=4. The rhombohedral phase of Fe(0.93)O is more compressible than B1-structured Fe0.93O, with K0=146 (+/-2) GPa. Magnesiowüstite-(Mg0.73Fe0.27)O remains cubic over the experimental pressure range, and has a bulk modulus of 154 (+/-3) GPa with K'=4.0 (+/-0.1).