DOI: 10.1029/2005gl024468. Determination of post‐perovskite phase transition boundary in MgSiO<sub>3</sub> using Au and MgO pressure standards

Determination of post‐perovskite phase transition boundary in MgSiO3 using Au and MgO pressure standards

10.1029/2005gl024468

Crossref journal-article

American Geophysical Union (AGU)

Geophysical Research Letters (13)

Abstract

We have determined the post‐perovskite phase transition boundary in MgSiO3 by in‐situ X‐ray diffraction measurements, using Au and MgO as internal pressure standards. Results demonstrate that phase transition occurs at 113 GPa and 2400 K with a positive Clapeyron slope of +4.7 MPa/K, based on the Au pressure scale. On the other hand, the simultaneous measurements of MgO standard show that the phase boundary is located at 119 GPa and 2400 K with a Clapeyron slope of +11.5 MPa/K, consistently with the previous experimental results based on the Pt scale and the theoretical calculations. Our experiments also indicate that the stabilities of perovskite and post‐perovskite in all of (Mg0.89Fe0.11)2SiO4, natural pyrolitic mantle, and MORB compositions are consistent with the phase transition boundary in pure MgSiO3, when all the data are compared using the same Au scale. The compositional variations in natural systems have little effect on the post‐perovskite phase transition.

Bibliography

Hirose, K., Sinmyo, R., Sata, N., & Ohishi, Y. (2006). Determination of postâperovskite phase transition boundary in MgSiO3 using Au and MgO pressure standards. Geophysical Research Letters, 33(1). Portico.

Authors 4

Kei Hirose (first)
Ryosuke Sinmyo (additional)
Nagayoshi Sata (additional)
Yasuo Ohishi (additional)

References 19 Referenced 84

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10.1103/PhysRevB.70.094112
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Dates

Type	When
Created	19 years, 7 months ago (Jan. 12, 2006, 4:18 p.m.)
Deposited	1 year, 10 months ago (Oct. 30, 2023, 8:57 p.m.)
Indexed	1 month ago (July 30, 2025, 6:26 a.m.)
Issued	19 years, 7 months ago (Jan. 13, 2006)
Published	19 years, 7 months ago (Jan. 13, 2006)
Published Online	19 years, 7 months ago (Jan. 13, 2006)
Published Print	19 years, 7 months ago (Jan. 16, 2006)

Funders 0

None

BibTeX

@article{Hirose_2006, title={Determination of post‐perovskite phase transition boundary in MgSiO3 using Au and MgO pressure standards}, volume={33}, ISSN={1944-8007}, url={http://dx.doi.org/10.1029/2005gl024468}, DOI={10.1029/2005gl024468}, number={1}, journal={Geophysical Research Letters}, publisher={American Geophysical Union (AGU)}, author={Hirose, Kei and Sinmyo, Ryosuke and Sata, Nagayoshi and Ohishi, Yasuo}, year={2006}, month=jan }

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