Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite- and post-perovskite-related structures
Article first published online: 6 JUN 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 11, June 2006
How to Cite
2006), Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite- and post-perovskite-related structures, Geophys. Res. Lett., 33, L11305, doi:10.1029/2006GL026150., , , , , and (
- Issue published online: 6 JUN 2006
- Article first published online: 6 JUN 2006
- Manuscript Accepted: 2 MAY 2006
- Manuscript Revised: 24 APR 2006
- Manuscript Received: 26 FEB 2006
 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.