TY - JOUR
T1 - In situ X-ray observation of decomposition of hydrous aluminum silicate AlSiO3OH and aluminum oxide hydroxide d-AlOOH at high pressure and temperature
AU - Sano, Asami
AU - Ohtani, Eiji
AU - Kubo, Tomoaki
AU - Funakoshi, Ken Ichi
PY - 2004/8/1
Y1 - 2004/8/1
N2 - 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.
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.
KW - C. High pressure
KW - C. X-ray diffraction
KW - D. Crystal structure
KW - D. Phase equilibria
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U2 - 10.1016/j.jpcs.2003.12.015
DO - 10.1016/j.jpcs.2003.12.015
M3 - Article
AN - SCOPUS:2942716911
VL - 65
SP - 1547
EP - 1554
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 8-9
ER -