Effects of Mg and Si ions on the symmetry of δ-AlOOH

被引：14

作者：

Komatsu, K. ^{[1
]}

Sano-Furukawa, A. ^{[2
]}

Kagi, H. ^{[1
]}

机构：

[1] Univ Tokyo, Geochem Res Ctr, Grad Sch Sci, Tokyo 1130033, Japan

[2] Japan Atom Energy Agcy, High Pressure Sci Grp, Quantum Beam Sci Directorate, Tokai, Ibaraki 3191195, Japan

来源：

PHYSICS AND CHEMISTRY OF MINERALS | 2011年 / 38卷 / 09期

关键词：

delta-AlOOH; High pressure; Neutron diffraction; Symmetry; Hydrogen bond; PRESSURE HYDROUS PHASE; NEUTRON-DIFFRACTION; BOND; CRYSTAL; ISOTOPE; SYMMETRIZATION;

D O I：

10.1007/s00269-011-0445-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We conducted powder neutron diffraction for delta-AlOOH samples with and without Mg and Si ions under ambient conditions in order to investigate the long-standing problem of the symmetry of this phase. The observed reflection conditions clearly show that the space group of pure delta-AlOOH is P(21)nm with ordered hydrogen bonds, whereas that of delta-(Al0.86Mg0.07Si0.07)OOH is Pnnm or Pnn2 with disordered hydrogen bonds. It is more likely that the space group of delta-(Al0.86Mg0.07Si0.07)OOH is Pnnm, because cation or hydrogen ordering that breaks the mirror plane perpendicular to c axis in the Pnnm structure would not occur. The previously reported inconsistency for the space group of this phase was caused by the substitution of Mg and Si ions to Al site, i.e., the disordered cations with different valences may fluctuate hydrogen positions, and the disordered hydrogen causes the symmetry change.

引用

页码：727 / 733

页数：7

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