In Situ X Ray Observation of the Phase Transitions from α to γ and from γ to Perovskite+Periclase in Mg2SiO4

T. Kato, T. Kubo, H. Morishima, E. Ohtani, A. Suzuki, D. Yamazaki, K. Mibe, T. Kikegawa, O. Shimomura

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5 Citations (Scopus)

Abstract

In situ X-ray observation has been made on MgsSiO4 forsterite in the pressure ranges over 250–30 GPa and 1250°C, using double stage multianvil system with sintered diamond anvil window and intense X-rays from synchrotm radiation. Forsterite (α-phase) transfomed into spinel (γ-phase) at 28 GPa and 800αC in the frist heating cycles of the two runs. Spinel transformed into the assemblage of perovskite and periclase in the second heating cycless at 26.4 GPa and 1200°C and at 28.5 GPa and 950°C. The results show that α-γ transition can proceed outside the stability field of spinel, and that the blocking temperature, above which the stable assmblage of perovskite and periclase can be formed, has a pressure dependence.

Original languageEnglish
Pages (from-to)119-121
Number of pages3
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume7
DOIs
Publication statusPublished - 1998

Keywords

  • Earth material
  • Kinetics
  • Phase relation
  • Phase transition mechanism
  • Synchrotron X-ray

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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