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Letter: Unquenchable hexagonal perovskite in high-pressure polymorphs of strontium silicates

  • Hitoshi Yusa EMAIL logo , Masaki Akaogi , Nagayoshi Sata , Hiroshi Kojitani , Yoshitaka Kato and Yasuo Ohishi
Published/Copyright: March 28, 2015
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American Mineralogist
From the journal American Mineralogist Volume 90 Issue 5-6

Abstract

The presence of hexagonal silicate perovskite (6H-BaTiO3 type) was confirmed in the SrSiO3 compound by in-situ angle dispersive X-ray diffraction at high pressure. The perovskite was crystallized from pressure-induced amorphous SrSiO3 in a diamond anvil cell by laser heating at 35 GPa. On releasing the pressure, the perovskite also changed into an amorphous state as does CaSiO3 perovskite. This SrSiO3 perovskite, with a tolerance factor greater than unity, forms a face-sharing SiO6 octahedron, which leads to a structure with hexagonal symmetry. Incorporation of Sr into CaSiO3 perovskite in the early stage of the differentiation in the Earth's mantle might have influenced the symmetry of CaSiO3 perovskite in the present lower mantle. As far as we know, this is the first report suggesting the existence of hexagonal perovskite in silicates.

Received: 2004-10-19
Accepted: 2005-2-25
Published Online: 2015-3-28
Published in Print: 2005-5-1

© 2015 by Walter de Gruyter Berlin/Boston

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  2. U-Pb SHRIMP ages recorded in the coesite-bearing zircon domains of paragneisses in the southwestern Sulu terrane, eastern China: New interpretation
  3. Petrogenesis of the Yangkou layered garnet-peridotite complex, Sulu UHP terrane, China
  4. Sodic amphibole exsolutions in garnet from garnet-peridotite, North Qaidam UHPM belt, NW China: Implications for ultradeep-origin and hydroxyl defects in mantle garnets
  5. Blueschists, eclogites, and decompression assemblages of the Zermatt-Saas ophiolite: High-pressure metamorphism of subducted Tethys lithosphere
  6. Coexisting retrograde jadeite and omphacite in a jadeite-bearing lawsonite eclogite from the Motagua Fault Zone, Guatemala
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  9. Subducted carbonates, metasomatism of mantle wedges, and possible connections to diamond formation: An example from California
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  13. Acquisition and evaluation of thermodynamic data for bieberite-moorhouseite equilibria at 0.1 MPa
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  17. Estimates of Ar diffusion and solubility in leucite and nepheline: Electron microprobe imaging of Ar distribution in a mineral
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  23. Stability of the MgCO3 structures under lower mantle conditions
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https://doi.org/10.2138/am.2005.1835

Articles in the same Issue

  1. Factors in the preservation of coesite: The importance of fluid inflitration
  2. U-Pb SHRIMP ages recorded in the coesite-bearing zircon domains of paragneisses in the southwestern Sulu terrane, eastern China: New interpretation
  3. Petrogenesis of the Yangkou layered garnet-peridotite complex, Sulu UHP terrane, China
  4. Sodic amphibole exsolutions in garnet from garnet-peridotite, North Qaidam UHPM belt, NW China: Implications for ultradeep-origin and hydroxyl defects in mantle garnets
  5. Blueschists, eclogites, and decompression assemblages of the Zermatt-Saas ophiolite: High-pressure metamorphism of subducted Tethys lithosphere
  6. Coexisting retrograde jadeite and omphacite in a jadeite-bearing lawsonite eclogite from the Motagua Fault Zone, Guatemala
  7. Calibrations of modal space for metamorphism of mafic schist
  8. Oxygen isotope geochemistry of rocks from the Pre-Pilot Hole of the Chinese Continental Scientific Drilling Project (CCSD-PPH1)
  9. Subducted carbonates, metasomatism of mantle wedges, and possible connections to diamond formation: An example from California
  10. Hawaiian mantle xenoliths and magmas: Composition and thermal character of the lithosphere
  11. Trace-element distribution coefficients for pyroxenes, plagioclase, and olivine in evolved tholeiites from the 1955 eruption of Kilauea Volcano, Hawaiʼi, and petrogenesis of differentiated rift-zone lavas
  12. Cation ordering in synthetic low-calcium actinolite
  13. Acquisition and evaluation of thermodynamic data for bieberite-moorhouseite equilibria at 0.1 MPa
  14. PRESIDENTIAL ADDRESS TO THE MINERALOGICAL SOCIETY OF AMERICA SEATTLE, NOVEMBER 4, 2003: A mineralogical and geochemical record of atmospheric photochemistry
  15. Synthesis and characterization of saponite clays
  16. Synthesis and characterization of saponite clays: Part 2. Thermal stability
  17. Estimates of Ar diffusion and solubility in leucite and nepheline: Electron microprobe imaging of Ar distribution in a mineral
  18. Growth and dissolution kinetics at the dolomite-water interface: An in-situ scanning probe microscopy study
  19. Crystal chemistry of Zn-rich rhodonite (“fowlerite”)
  20. The origin of the green color of variscite
  21. HRTEM evidence for 8-reversals in the m = 17 antigorite polysome
  22. Origin of high-Ag fahlores from the Galena Mine, Wallace, Idaho, U.S.A.
  23. Stability of the MgCO3 structures under lower mantle conditions
  24. The 10 Å phase: Crystal structure from single-crystal X-ray data
  25. Letter: Unquenchable hexagonal perovskite in high-pressure polymorphs of strontium silicates
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