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
N1 - Funding Information:
In situ X-ray diffraction experiments were conducted using SPEED1500 high-pressure system at BL04-B1 of SPring-8 in Japan Synchrotron Radiation Research Institute (Proposal 2000B0447-ND-np and 2001A0195-ND-np). This work was supported partially by a Grant-in-Aid for the Scientific Research of Priority Area of Ministry of Education, Culture, Sport, Science and Technology of Japanese Government (No.12126201) and that for the Scientific Research (S) (No. 14102009) to Eiji Ohtani.
PY - 2004/8
Y1 - 2004/8
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.
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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
SN - 0022-3697
VL - 65
SP - 1547
EP - 1554
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 8-9
ER -