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Contributions to Mineralogy and Petrology

, Volume 166, Issue 5, pp 1375–1388 | Cite as

Crystal structure, Raman and FTIR spectroscopy, and equations of state of OH-bearing MgSiO3 akimotoite

  • Yu YeEmail author
  • Joseph R. Smyth
  • Steven D. Jacobsen
  • Wendy R. Panero
  • David A. Brown
  • Tomoo Katsura
  • Yun-Yuan Chang
  • Joshua P. Townsend
  • Przemyslaw Dera
  • Sergey Tkachev
  • Cayman Unterborn
  • Zhenxian Liu
  • Céline Goujon
Original Paper
  • 551 Downloads

Abstract

MgSiO3 akimotoite is stable relative to majorite-garnet under low-temperature geotherms within steeply or rapidly subducting slabs. Two compositions of Mg–akimotoite were synthesized under similar conditions: Z674 (containing about 550 ppm wt H2O) was synthesized at 22 GPa and 1,500 °C and SH1101 (nominally anhydrous) was synthesized at 22 GPa and 1,250 °C. Crystal structures of both samples differ significantly from previous studies to give slightly smaller Si sites and larger Mg sites. The bulk thermal expansion coefficients of Z674 are (153–839 K) of a 1 = 20(3) × 10−9 K−2 and a 0 = 17(2) × 10−6 K−1, with an average of α 0 = 27.1(6) × 10−6 K−1. Compressibility at ambient temperature of Z674 was measured up to 34.6 GPa at Sector 13 (GSECARS) at Advanced Photon Source Argonne National Laboratory. The second-order Birch–Murnaghan equation of state (BM2 EoS) fitting yields: V 0 = 263.7(2) Å3, K T0 = 217(3) GPa (K′ fixed at 4). The anisotropies of axial thermal expansivities and compressibilities are similar: α a  = 8.2(3) and α c  = 10.68(9) (10−6 K−1); β a  = 11.4(3) and β c  = 15.9(3) (10−4 GPa). Hydration increases both the bulk thermal expansivity and compressibility, but decreases the anisotropy of structural expansion and compression. Complementary Raman and Fourier transform infrared (FTIR) spectroscopy shows multiple structural hydration sites. Low-temperature and high-pressure FTIR spectroscopy (15–300 K and 0–28 GPa) confirms that the multiple sites are structurally unique, with zero-pressure intrinsic anharmonic mode parameters between −1.02 × 10−5 and +1.7 × 10−5 K−1, indicating both weak hydrogen bonds (O–H···O) and strong OH bonding due to long O···O distances.

Keywords

Akimotoite Crystal structure Thermal expansion Compressibility Anisotropy FTIR 

Notes

Acknowledgments

This work was supported by US National Science Foundation Grants EAR 11-13369 to JRS, EAR-0748707 (CAREER) to SDJ, and EAR-0955647 (CAREER) to WRP. We also acknowledge the support from Carnegie/DOE Alliance Center (CDAC) and the David and Lucile Packard Foundation. Synthesis was carried out at Bayerisches Geoinstitut (BGI), through support of the BGI Visitors Program. Neal Blair is acknowledged for access to the FTIR microscope at Northwestern University. GeoSoilEnviroCARS was supported by the NSF (EAR-0622171), the Department of Energy (DOE) DE-FG02-94ER14466, and the State of Illinois. Use of the Advanced Photon Source was supported by the DOE Office of Science, Office of Basic Energy Sciences, Under Contract No. DE-AC02-06CH11357. The use of the U2A beamline at the National Synchrotron Light Source beamline was supported by COMPRES, through the NSF Cooperative Agreement EAR 06-49658 and by the DOE, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Yu Ye
    • 1
    • 9
    Email author
  • Joseph R. Smyth
    • 2
  • Steven D. Jacobsen
    • 3
  • Wendy R. Panero
    • 4
  • David A. Brown
    • 2
  • Tomoo Katsura
    • 5
  • Yun-Yuan Chang
    • 3
  • Joshua P. Townsend
    • 3
  • Przemyslaw Dera
    • 6
  • Sergey Tkachev
    • 6
  • Cayman Unterborn
    • 4
  • Zhenxian Liu
    • 7
  • Céline Goujon
    • 8
  1. 1.Department of PhysicsUniversity of ColoradoBoulderUSA
  2. 2.Department of Geological SciencesUniversity of ColoradoBoulderUSA
  3. 3.Department of Earth and Planetary SciencesNorthwestern UniversityEvanstonUSA
  4. 4.School of Earth SciencesOhio State UniversityColumbusUSA
  5. 5.Bayerisches GeoinstitutUniversität BayreuthBayreuthGermany
  6. 6.Center for Advanced Radiation SourcesUniversity of Chicago, Argonne National LaboratoryArgonneUSA
  7. 7.Geophysical LaboratoryCarnegie Institution of WashingtonWashingtonUSA
  8. 8.Institut NéelCNRS and Université Joseph FourierGrenoble Cedex 9France
  9. 9.School of Earth and Space ExplorationArizona State UniversityTempeUSA

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