An in situ X ray diffraction study of the α-β transformation kinetics of Mg2SiO4

Tomoaki Kubo, Eiji Ohtani, Takumi Kato, Hideaki Morishima, Daisuke Yamazaki, Akio Suzuki, Kenji Mibe, Takumi Kikegawa, Osamu Shimomura

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Abstract

This is the first report of the direct measurement of α-β transformation kinetics in Mg2SiO4, a major constituent in the Earth's mantle, through in situ X ray diffraction experiments at high pressure. The experiments were conducted using the sintered diamond cubic-anvil apparatus with synchrotron radiation (MAX 80). Although the present work is still preliminary, the kinetic data were analyzed using a nucleation and growth model. The growth rate of β-phase is determined to be 3.3 (1.6∼4.9) × 10-10 m/s at 13.0 GPa and 900°C, 7.1 (3.4∼10) × 10-10 m/s at 14.1 GPa and 885°C, and 1.5 (0.7∼2.3) × 10-9 m/s at 14.9 GPa and 875°C.

Original languageEnglish
Pages (from-to)695-698
Number of pages4
JournalGeophysical Research Letters
Volume25
Issue number5
DOIs
Publication statusPublished - Mar 1 1998
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Kubo, T., Ohtani, E., Kato, T., Morishima, H., Yamazaki, D., Suzuki, A., Mibe, K., Kikegawa, T., & Shimomura, O. (1998). An in situ X ray diffraction study of the α-β transformation kinetics of Mg2SiO4. Geophysical Research Letters, 25(5), 695-698. https://doi.org/10.1029/98GL00224