Hauptseite > Publikationsdatenbank > Crystal chemistry of Fe$^{3+}$-bearing (Mg, Fe)SiO$_{3}$ perovskite: a single-crystal X-ray diffraction study > print

001     201449
005     20250129094406.0
024 7 _ |a 10.1007/s00269-013-0639-8
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024 7 _ |a 0342-1791
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024 7 _ |a 1432-2021
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037 _ _ |a FZJ-2015-03744
041 _ _ |a English
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100 1 _ |a Sinmyo, Ryosuke
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245 _ _ |a Crystal chemistry of Fe$^{3+}$-bearing (Mg, Fe)SiO$_{3}$ perovskite: a single-crystal X-ray diffraction study
260 _ _ |a Berlin
|c 2014
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336 7 _ |a Journal Article
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520 _ _ |a Magnesium silicate perovskite is the predominant phase in the Earth’s lower mantle, and it is well known that incorporation of iron has a strong effect on its crystal structure and physical properties. To constrain the crystal chemistry of (Mg, Fe)SiO3 perovskite more accurately, we synthesized single crystals of Mg0.946(17)Fe0.056(12)Si0.997(16)O3 perovskite at 26 GPa and 2,073 K using a multianvil press and investigated its crystal structure, oxidation state and iron-site occupancy using single-crystal X-ray diffraction and energy-domain Synchrotron Mössbauer Source spectroscopy. Single-crystal refinements indicate that all iron (Fe2+ and Fe3+) substitutes on the A-site only, where Fe3+/ΣFe∼20% based on Mössbauer spectroscopy. Charge balance likely occurs through a small number of cation vacancies on either the A- or the B-site. The octahedral tilt angle (Φ) calculated for our sample from the refined atomic coordinates is 20.3°, which is 2° higher than the value calculated from the unit-cell parameters (a = 4.7877 Å, b = 4.9480 Å, c = 6.915 Å) which assumes undistorted octahedra. A compilation of all available single-crystal data (atomic coordinates) for (Mg, Fe)(Si, Al)O3 perovskite from the literature shows a smooth increase of Φ with composition that is independent of the nature of cation substitution (e.g., Mg2+−Fe2+ or Mg2+Si4+−Fe3+Al3+ substitution mechanism), contrary to previous observations based on unit-cell parameter calculations.
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700 1 _ |a McCammon, Catherine
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773 _ _ |a 10.1007/s00269-013-0639-8
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