Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite- and post-perovskite-related structures

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...

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Veröffentlicht in:Geophysical research letters 2006-06, Vol.33 (11), p.n/a
Hauptverfasser: Martin, C. David, Crichton, Wilson A., Liu, Haozhe, Prakapenka, Vitali, Chen, Jiuhua, Parise, John B.
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Sprache:eng
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Zusammenfassung: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.
ISSN:0094-8276
1944-8007
DOI:10.1029/2006GL026150