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High-pressure experimental study of tetragonal CaSiO3-perovskite to 200 GPa

  • Ningyu Sun , Hui Bian , Youyue Zhang , Jung-Fu Lin , Vitali B. Prakapenka and Zhu Mao
Published/Copyright: December 28, 2021
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American Mineralogist
From the journal American Mineralogist Volume 107 Issue 1

Abstract

In this study, we have investigated the crystal structure and equation of state of tetragonal CaSiO3- perovskite up to 200 GPa using synchrotron X‑ray diffraction in laser-heated diamond-anvil cells. X‑ray diffraction patterns of the quenched CaSiO3-perovskite above 148 GPa clearly show that 200, 211, and 220 peaks of the cubic phase split into 004+220, 204+312, and 224+400 peak pairs, respectively, in the tetragonal structure, and their calculated full-width at half maximum (FWHM) exhibits a substantial increase with pressure. The distribution of diffraction peaks suggests that the tetragonal CaSiO3- perovskite most likely has an I4/mcm space group at 300 K between 148 and 199 GPa, although other possibilities might still exist. Using the Birch-Murnaghan equations, we have determined the equation of state of tetragonal CaSiO3-perovskite, yielding the bulk modulus K0T = 227(21) GPa with the pressure derivative of the bulk modulus, K′0T = 4.0(3). Modeled sound velocities at 580 K and around 50 GPa using our results and literature values show the difference in the compressional (VP) and shear-wave velocity (VS) between the tetragonal and cubic phases to be 5.3 and 6.7%, respectively. At ~110 GPa and 1000 K, this phase transition leads to a 4.3 and 9.1% jump in VP and VS, respectively. Since the addition of Ti can elevate the transition temperature, the transition from the tetragonal to cubic phase may have a seismic signature compatible with the observed mid-lower mantle discontinuity around the cold subduction slabs, which needs to be explored in future studies.

Keywords: Tetragonal CaSiO3-perovskite; equation of state; crystal structure; high pressure

Funding statement: Z. Mao acknowledges supports from the National Science Foundation of China (41874101), Strategic Priority Research Program of the Chinese Academy of Sciences (XDB41000000), National Key R&D Program of China (2018YFA0702703), and Funds for leading talents of USTC (KY2080000061). N. Sun acknowledges supports from Fundamental Research Funds for the Central Universities (WK2080000133). J.F. Lin acknowledges support from Geophysics Program of the National Science Foundation (EAR-1916941). Portions of this work were performed at GeoSoilEnviroCARS (The University of Chicago, Sector 13), Advanced Photon Source (APS), Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation-Earth Sciences (EAR-1634415) and Department of Energy-GeoSciences (DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

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Received: 2020-11-29
Accepted: 2021-01-15
Published Online: 2021-12-28
Published in Print: 2022-01-27

© 2022 Mineralogical Society of America

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https://doi.org/10.2138/am-2021-7913
Keywords for this article
Tetragonal CaSiO3-perovskite; equation of state; crystal structure; high pressure

Articles in the same Issue

  1. MSA Presidential Address
  2. MSA at 100 and why optical mineralogy still matters: The optical properties of talc
  3. Boron isotope compositions establish the origin of marble from metamorphic complexes: Québec, New York, and Sri Lanka
  4. Celleriite, □(Mn22+Al)Al6(Si6O18)(BO3)3(OH)3(OH), , a new mineral species of the tourmaline supergroup
  5. Jingsuiite, TiB2, a new mineral from the Cr-11 podiform chromitite orebody, Luobusa ophiolite, Tibet, China: Implications for recycling of boron
  6. Incorporation of incompatible trace elements into molybdenite: Layered PbS precipitates within molybdenite
  7. Experimental melt inclusion homogenization in a hydrothermal diamond-anvil cell: Comparison with homogenization at one atmosphere
  8. Thermoelastic properties of zircon: Implications for geothermobarometry
  9. A Rayleigh model of cesium fractionation in granite-pegmatite systems
  10. The atomic arrangement and electronic interactions in vonsenite at 295, 100, and 90 K
  11. Oxalate formation by Aspergillus niger on minerals of manganese ores
  12. High-pressure experimental study of tetragonal CaSiO3-perovskite to 200 GPa
  13. Mesoproterozoic seafloor authigenic glauconite-berthierine: Indicator of enhanced reverse weathering on early Earth
  14. Chemical variability in vyacheslavite, U(PO4)(OH): Crystal-chemical implications for hydrous and hydroxylated U4+, Ca, and REE phosphates
  15. Bennesherite, Ba2Fe2+Si2O7: A new melilite group mineral from the Hatrurim Basin, Negev Desert, Israel
  16. Single-crystal elasticity of phase Egg AlSiO3OH and δ-AlOOH by Brillouin spectroscopy
  17. Letter
  18. On the formation of Martian blueberries
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