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

C. David Martin; Wilson A. Crichton; Haozhe Liu; Vitali Prakapenka; Jiuhua Chen; John B. Parise

doi:10.1029/2006GL026150

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

C. David Martin
, Wilson A. Crichton
, Haozhe Liu
, Vitali Prakapenka
, Jiuhua Chen
, John B. Parise

Geosciences

Stony Brook University
European Synchrotron Radiation Facility
Argonne National Laboratory

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

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.

Original language	English
Article number	L11305
Journal	Geophysical Research Letters
Volume	33
Issue number	11
DOIs	https://doi.org/10.1029/2006GL026150
State	Published - Jun 16 2006

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title = "Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite- and post-perovskite-related structures",

abstract = "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.",

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T1 - Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite- and post-perovskite-related structures

AU - Martin, C. David

AU - Crichton, Wilson A.

AU - Liu, Haozhe

AU - Prakapenka, Vitali

AU - Chen, Jiuhua

AU - Parise, John B.

PY - 2006/6/16

Y1 - 2006/6/16

N2 - 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.

AB - 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.

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U2 - 10.1029/2006GL026150

DO - 10.1029/2006GL026150

M3 - Article

AN - SCOPUS:33746418455

SN - 0094-8276

VL - 33

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 11

M1 - L11305

ER -

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

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