Powder-neutron diffraction studies of geometric isotope and hydrogen-bonding effects in β-CrOOH

被引：20
作者：
Fujihara, T
Ichikawa, M [1 ]
Gustafsson, T
Olovsson, I
Tsuchida, T
机构：
[1] Hokkaido Univ, Grad Sch Sci, Div Phys, Sapporo, Hokkaido 0600810, Japan
[2] Uppsala Univ, Angstrom Lab, SE-75121 Uppsala, Sweden
[3] Hokkaido Univ, Grad Sch Engn, Div Mat Sci & Engn, Sapporo, Hokkaido 0608628, Japan
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2002年 / 63卷 / 02期
关键词：
inorganic compounds; neutron scattering; crystal structure;
D O I：
10.1016/S0022-3697(01)00147-0
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Powder-neutron diffraction studies have been done on beta -CrOOH and beta -CrOOD to confirm whether or not the reported exceptionally large geometric isotope effect is real, and also to study hydrogen-bonding effects in beta -CrOOH compared to the prototype CrO2. The R(O . . .O) distance in the H-compound at room temperature is confirmed to be 2.472(3) Angstrom, but in the D-compound it is significantly shorter, 2.518(3) Angstrom, than in the earlier work. The resulting magnitude of the geometric isotope effect, 0.046(4) Angstrom, is thus not as exceptionally large as earlier reported, but is still within the maximum range. Structural comparison with CrO2 clarified the hydrogen-bonding effect in beta -CrOOH: the formation of hydrogen bonds brings CrO6 Closer to a regular octahedron. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：309 / 315
页数：7
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