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Single-crystal synchrotron X-ray diffraction study of wüstite and magnesiowüstite at lower-mantle pressures by Steven D. Jacobsen; Jung-Fu Lin; Ross J. Angel; Guoyin Shen; Vitali B. Prakapenka; Przemyslaw Dera; Ho-kwang Mao; Russell J. Hemley is a Physics and Astronomy article available to read on EtoBox.

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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-Fe 0.93 O and magnesiowu ̈stite-(Mg 0.73 Fe 0.27 )O to 51 GPa in a hydrostatic helium pressure medium. The rhombohedral phase of Fe 0.93 O was observed above 23 GPa, and its isothermal bulk modulus (K 0 ) was determined to be 134 (AE4) GPa, assuming K 0 = 4. The rhombohedral phase of Fe 0.93 O is more compressible than B1structured Fe 0.93 O, with K 0 = 146 (AE2) GPa. Magnesiowu ̈stite-(Mg 0.73 Fe 0.27 )O remains cubic over the experimental pressure range, and has a bulk modulus of 154 (AE3) GPa with K 0 = 4.0 (AE0.1).

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Author

Steven D. Jacobsen; Jung-Fu Lin; Ross J. Angel; Guoyin Shen; Vitali B. Prakapenka; Przemyslaw Dera; Ho-kwang Mao; Russell J. Hemley

Publisher

International Union of Crystallography (IUCr)

Published

2005

Language

EN

Field

Physics and Astronomy (Physical Sciences)