Physics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3311305m&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 11, CiteID L11305
Physics
19
Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Mineral Physics: High-Pressure Behavior, Mineral Physics: Equations Of State, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction, Planetary Sciences: Solid Surface Planets: Interiors (8147)
Scientific paper
Monochromatic x-ray diffraction data collected in-situ within the diamond anvil cell show perovskite structured Neighborite (NaMgF3) transforms to the CaIrO3-type post-perovskite structure between 28 and 30 GPa. Upon laser heating, the CaIrO3-type structure transforms further to an unknown structure (Pnnm, designated N-phase). Upon pressure release, N-phase NaMgF3 becomes x-ray amorphous. A structure transformation in post-perovskite MgSiO3 and MgGeO3 to N-phase may account for previous observations of extra x-ray reflections during high pressure experiments and tomographic observations of an additional boundary in the lower mantle below the D'' discontinuity.
Chen Jiuhua
Crichton Wilson A.
Liu Haozhe
Martin Donn Christopher
Parise John B.
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