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Infrared (IR) absorption spectra of antigorite were measured up to 27 GPa and 320 °C using synchrotron IR radiation to elucidate OH group behavior under high-pressure (HP) and high-temperature (HT) conditions. The absorption bands attributable to the OH stretching modes of outer OH groups (OH outer ) and inner OH groups (OH inner ) show positive pressure dependencies. The shift rate of the OHinner band is almost constant at all pressure ranges. In contrast, that of the OH outer  band increases slightly at about 6 GPa. This discontinuous change of the shift rate is consistent with the anomalous behavior of the OH outer  upon compression, which was predicted in the previous first-principle calculation study. Specifically, the pressure dependence of the OH outer  band shows that the hydrogen ion of an OH outer  interacts not only with the nearest basal oxygen ion of the SiO 4  tetrahedron but also with the second nearest two basal oxygen ions upon compression. The latter interaction becomes dominant over the former interaction at about 6 GPa.

american mineralogist

OH group behavior and pressure-induced amorphization of antigorite examined under high pressure and temperature using synchrotron infrared spectroscopy