Compression behaviors of distorted rutile-type hydrous phases, MOOH (M = Ga, In, Cr) and CrOOD
Compression behaviors of distorted rutile-type hydrous phases, MOOH (M = Ga, In, Cr) and CrOOD
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DOI：
10.1007/s00269-012-0487-y
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发表时间：
2012-03
影响因子：
1.4
通讯作者：
A. Sano‐Furukawa;T. Yagi;T. Okada;H. Gotou;T. Kikegawa
中科院分区：
文献类型：
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作者：
A. Sano‐Furukawa;T. Yagi;T. Okada;H. Gotou;T. Kikegawa
变形金红石型羟基氧化物β-GaOOH、InOOH、β-CrOOH和β-CrOOD的X射线衍射测量是在室温、准流体静力学条件下，在最大压力高达35 GPa下进行的。β-GaOOH、InOOH和β-CrOOD的相对晶格常数和轴比的变化异常表明，在形成氢键的地方，沿沿着a-和/或球-轴的各向异性硬化。β-GaOOH和InOOH在15 GPa下发生变化，β-CrOOD在4GPa下发生变化。在环境压力下，具有较长O... O氢键距离的氢氧化物的压力较高。相比之下，这种硬化行为没有观察到CrOOH，它具有显着的短O. O距离和强氢键。在本研究中观察到的硬化行为可以归因于羟基氧化物中氢键的对称化，如先前在δ-AlOOH（D）中所发现的。
X-ray diffraction measurements of distorted rutile-type oxyhydroxides β-GaOOH, InOOH, β-CrOOH, and β-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 β-GaOOH, InOOH, and β-CrOOD suggest anisotropic stiffening along thea- and/orb-axes where the hydrogen bond is formed. The changes were observed at 15 GPa in β-GaOOH and InOOH and at 4 GPa in β-CrOOD. The pressures were higher in oxyhydroxides that have longer O…O distances of the hydrogen bond at ambient pressure. In contrast, such stiffening behavior was not observed in CrOOH, which has a significant short O…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 δ-AlOOH(D).