Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite- and post-perovskite-related structures
Article
Martin, CD, Crichton, WA, Liu, H et al. (2006). Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite- and post-perovskite-related structures
. GEOPHYSICAL RESEARCH LETTERS, 33(11), 10.1029/2006GL026150
Martin, CD, Crichton, WA, Liu, H et al. (2006). Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite- and post-perovskite-related structures
. GEOPHYSICAL RESEARCH LETTERS, 33(11), 10.1029/2006GL026150
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. Copyright 2006 by the American Geophysical Union.
