In situ X-ray observation of decomposition of hydrous aluminum silicate AlSiO3OH and aluminum oxide hydroxide d-AlOOH at high pressure and temperature

Asami Sano, Eiji Ohtani, Tomoaki Kubo, Ken Ichi Funakoshi

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

We clarified the stability limit of phase Egg, AlSiO3OH, a candidate for water reservoir in the siliceous sediment of slabs in the transition zone conditions by in situ X-ray observation using high energy X-ray from synchrotron radiation source of SPring-8. Phase Egg is stable at least up to 1625 °C at 17 GPa. We observed decomposition of phase Egg into δ-AlOOH and stishovite at pressures greater than 23 GPa at temperatures below 1200 °C. No water release occurs associated with the decomposition. At temperatures above 1200 °C at 23 GPa, we observed decomposition of phase Egg into corundum+stishovite+fluid. We also determined the phase boundary of the decomposition reaction of δ-AlOOH to corumdum+fluid based on the in situ X-ray diffraction at high pressure and temperature.

Original languageEnglish
Pages (from-to)1547-1554
Number of pages8
JournalJournal of Physics and Chemistry of Solids
Volume65
Issue number8-9
DOIs
Publication statusPublished - Aug 1 2004
Externally publishedYes

Fingerprint

Aluminum Silicates
aluminum silicates
eggs
hydroxides
Silicates
aluminum oxides
stishovite
Decomposition
Aluminum
decomposition
X rays
Oxides
oxides
x rays
Temperature
Corundum
Fluids
Aluminum Oxide
fluids
Phase boundaries

All Science Journal Classification (ASJC) codes

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

Cite this

In situ X-ray observation of decomposition of hydrous aluminum silicate AlSiO3OH and aluminum oxide hydroxide d-AlOOH at high pressure and temperature. / Sano, Asami; Ohtani, Eiji; Kubo, Tomoaki; Funakoshi, Ken Ichi.

In: Journal of Physics and Chemistry of Solids, Vol. 65, No. 8-9, 01.08.2004, p. 1547-1554.

Research output: Contribution to journalArticle

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AU - Kubo, Tomoaki

AU - Funakoshi, Ken Ichi

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AB - We clarified the stability limit of phase Egg, AlSiO3OH, a candidate for water reservoir in the siliceous sediment of slabs in the transition zone conditions by in situ X-ray observation using high energy X-ray from synchrotron radiation source of SPring-8. Phase Egg is stable at least up to 1625 °C at 17 GPa. We observed decomposition of phase Egg into δ-AlOOH and stishovite at pressures greater than 23 GPa at temperatures below 1200 °C. No water release occurs associated with the decomposition. At temperatures above 1200 °C at 23 GPa, we observed decomposition of phase Egg into corundum+stishovite+fluid. We also determined the phase boundary of the decomposition reaction of δ-AlOOH to corumdum+fluid based on the in situ X-ray diffraction at high pressure and temperature.

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