Compression behaviors of distorted rutile-type hydrous phases, MOOH (M = Ga, In, Cr) and CrOOD

作者：Sano Furukawa Asami^*; Yagi Takehiko; Okada Taku; Gotou Hirotada; Kikegawa Takumi

来源：Physics and Chemistry of Minerals, 2012, 39(5): 375-383.

DOI：10.1007/s00269-012-0487-y

• Hydrous mineral
• High pressure
• Equation of state
• Hydrogen bond
• Symmetrization

X-ray diffraction measurements of distorted rutile-type oxyhydroxides beta-GaOOH, InOOH, beta-CrOOH, and beta-CrOOD were taken at a maximum pressure of up to 35 GPa under quasi-hydrostatic conditions, at ambient temperature. Anomalies in the evolution of the relative lattice constants and the axial ratios of beta-GaOOH, InOOH, and beta-CrOOD suggest anisotropic stiffening along the a- and/or b-axes where the hydrogen bond is formed. The changes were observed at 15 GPa in beta-GaOOH and InOOH and at 4 GPa in beta-CrOOD. The pressures were higher in oxyhydroxides that have longer OaEuro broken vertical bar O distances of the hydrogen bond at ambient pressure. In contrast, such stiffening behavior was not observed in CrOOH, which has a significant short OaEuro broken vertical bar O distance and strong hydrogen bond. The stiffening behaviors observed in the present study can be attributed to the symmetrization of the hydrogen bonds in oxyhydroxides, as was previously found in delta-AlOOH(D).

• 出版日期2012-5