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Physics and Chemistry of Minerals

, Volume 39, Issue 2, pp 123–129 | Cite as

Reaction of forsterite with hydrogen molecules at high pressure and temperature

  • Ayako ShinozakiEmail author
  • Hisako Hirai
  • Hiroyuki Kagi
  • Tadashi Kondo
  • Taku Okada
  • Daisuke Nishio-Hamane
  • Shin-ichi Machida
  • Tetsuo Irifune
  • Takumi Kikegawa
  • Takehiko Yagi
Original Paper

Abstract

High pressure and temperature reactions of a mixture of forsterite and hydrogen molecules have been carried out using a laser heated diamond anvil cell at 9.8–13.2 GPa and ~1,000 K. In situ X-ray diffraction measurements showed no sign of decomposition or phase transitions of the forsterite under these experimental conditions, indicating that the olivine structure was maintained throughout all runs. However, a substantial expansion of the unit cell volume of the forsterite was observed for samples down to ~3 GPa upon quenching to ambient pressure at room temperature. The Raman spectroscopy measurements under pressure showed significant shifts of the Raman peaks of the Si–O vibration modes for forsterite and of the intramolecular vibration mode for H2 molecules toward a lower frequency after heating. Additionally, no OH vibration modes were observed by Raman and FT-IR spectroscopic measurements. These lines of evidence show that the observed volume expansion in forsterite is not explained by the incorporation of hydrogen atoms as hydroxyl, but suggest the presence of hydrogen as molecules in the forsterite structure under these high pressure and temperature conditions.

Keywords

Forsterite Hydrogen molecules X-ray diffraction Raman spectroscopy Laser heated diamond anvil cells 

Notes

Acknowledgments

We thank K. Fujino, H. Ohfuji, and Y. Kuwayama for technical support and discussion. This study was supported by the G-COE program Deep Earth Mineralogy. A. Shinozaki was supported by a JSPS Research Fellowship for Young Scientists.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Ayako Shinozaki
    • 1
    Email author
  • Hisako Hirai
    • 1
  • Hiroyuki Kagi
    • 2
  • Tadashi Kondo
    • 3
  • Taku Okada
    • 4
  • Daisuke Nishio-Hamane
    • 4
  • Shin-ichi Machida
    • 1
  • Tetsuo Irifune
    • 1
  • Takumi Kikegawa
    • 5
  • Takehiko Yagi
    • 4
  1. 1.Geodynamics Research CenterEhime UniversityMatsuyamaJapan
  2. 2.Geochemical Research Center, Graduate School of ScienceUniversity of TokyoTokyoJapan
  3. 3.Department of Earth and Space Science, Graduate School of ScienceOsaka UniversityToyonaka, OsakaJapan
  4. 4.Institute for Solid State PhysicsUniversity of TokyoKashiwa, ChibaJapan
  5. 5.High Energy Acceleration Research OrganizationTsukubaJapan

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