Multisite disordered structure of ice VII to 20 GPa
Multisite disordered structure of ice VII to 20 GPa
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DOI：
10.1103/physrevlett.81.2719
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发表时间：
1998-09-28
影响因子：
8.6
通讯作者：
Klotz, S
中科院分区：
文献类型：
--
作者：
Nelmes, RJ;Loveday, JS;Klotz, S
在压力高达20 Gpa的情况下，对冰VII和冰的中子衍射测量提供了D2O冰vii中氧和氢原子的多位无序的直接证据，并给出了位分离的大小。当氧位沿[111]方向移动时，得到的O-D距离和在帽-D角上的D-(O)最接近冰VIII中的O-D距离和D-(O)。这样的位移意味着一个与在冰VIII中发现的显著不同的氢键几何结构，这可能意味着中心向冰X的转变。[S0031-9007(98)07166-X]。
Neutron diffraction measurements on ice VII and ice VIII at pressures up to 20 GPa provide direct evidence of multisite disorder of both oxygen and deuterium atoms in D2O ice VII, and give the magnitudes of the site separations. An O-D distance and D-(O) over cap-D angle closest to those found in ice VIII are obtained with oxygen sites displaced along [111] directions. Such displacements imply an H-bond geometry significantly different from that found in ice VIII, and this may have implications for the centering transition to ice X. [S0031-9007(98)07166-X].