Research Project
Grant-in-Aid for Scientific Research (C)
Experimental techniques to make in-situ AC impedance measurements at high pressures and temperatures was developed using diamond anvil cells and CO2 laser heating. AC impedance of high-pressure H2O ices was measured up to 50 GPa and 2000 K. The impedance decreased gradually with increasing temperature and some discontinuous changes were observed at around 40 GPa. The change might correspond to the transformation into a superionic phase. On the other hand, during increasing pressure at room temperature, the impedance decreased with increasing pressure and took a local minimum at around 10 GPa. Then, it increased with pressure. From view point of molecular dynamics simulation, the trough of the impedance can be interpreted from collaboration of proton conduction of ionic defects and rotation defects in ices.
All 2012 2011 2010 Other
All Journal Article (12 results) (of which Peer Reviewed: 12 results) Presentation (29 results)
PHYSICAL REVIEW B
Volume: 85巻 Issue: 9 Pages: 94413-94413
10.1103/physrevb.85.094113
Physics and Chemistry of Minerals
Volume: 39 Issue: 2 Pages: 123-129
10.1007/s00269-011-0467-7
High Pressure Research
Volume: 31 Issue: 4 Pages: 592-602
10.1080/08957959.2011.618130
Inorg.Chem.
Volume: 50 Issue: 22 Pages: 11787-11794
10.1021/ic201901a
Japanese Journal of Applied Physics
Volume: 50 Issue: 9R Pages: 95503-95503
10.1143/jjap.50.095503
210000071192
INORGANIC CHEMISTRY
Volume: 50巻 Issue: 8 Pages: 3281-3285
10.1021/ic101916c
J.Am.Chem.Soc.
Volume: 133 Issue: 15 Pages: 6036-6043
10.1021/ja200410z
PHYSICS AND CHEMISTRY OF MINERALS
Volume: 38 Pages: 251-258
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
Volume: 180 Pages: 195-202
Volume: 81 Pages: 134103-134103
Volume: 82 Pages: 92103-92103
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume: 211 Pages: 2138-2147