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D/H isotope effects in distorted rutile type hydrous minerals

Sano, Asami   ; Komatsu, Kazuki*; Kagi, Hiroyuki*; Nagai, Takaya*; Hattori, Takanori   

$$delta$$-AlOOH, distorted rutile type oxyhydroxide is an important hydrous mineral in the deep earth because it is stable at the lower mantle condition. X-ray diffraction study found the change in the compressibility at high pressure which would be attributed to the symmetrization of hydrogen bond, but there is a difference in the pressure where the compression behaviors change. To investigate the D/H isotope effect on the symmetrization, high pressure neutron diffraction experiments were conducted at SNAP, SNS. The intensity of 120 reflection continues to decrease at high pressure and become almost zero intensity at 6.7 GPa, suggesting the transition from P2$$_{1}$$nm to Pnnm as a precursor of the symmetrization. Strong D/H isotope effect was found in the hydrogen bond geometry; O-H distances are longer than O-D whereas H...O distances are shorter than D...O.

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