The structure of the trihydride GdH3
The structure of the trihydride GdH3
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DOI：
10.1016/s0925-8388(00)01055-0
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发表时间：
2000-09
影响因子：
6.2
通讯作者：
M. Ellner;H. Reule;E. Mittemeijer
中科院分区：
文献类型：
--
作者：
M. Ellner;H. Reule;E. Mittemeijer
采用Guinier粉末衍射图测定了三氢化物GdH_3（Pearson符号hP_（24），空间群P_3_xc_1，HoH_3型）的晶胞参数。间隙化合物GdH 3的结构是通过离开钆的六方密堆积子结构并通过用氢原子填充其四面体和三角形原子位置而形成的。六方密排结构中间隙原子位置的占据导致晶格膨胀，并伴随着轴比c/a的显著变化。在中间阶段的二元系统Gd-H，钆和氢原子之间的原子间距离，dGd-H，随着氢含量的增加而减小;最短的dGd-H距离被观察到发生在GdH 3。获得GdH 3的一组粉末衍射数据。
The unit cell parameters of the trihydride GdH3(Pearson symbol hP24, space group P3̄c1, HoH3type) were determined employing Guinier powder diffraction patterns. The structure of the interstitial compound GdH3is formed by departing from a hexagonal close-packed substructure of gadolinium and by filling its tetrahedral and triangular atomic positions with hydrogen atoms. The occupation of interstitial atomic positions in the hexagonal close-packed structure causes lattice dilatation associated with a significant change of the axial ratio c/a. In the intermediate phases of the binary system Gd–H, the interatomic distance between gadolinium and hydrogen atoms, dGd–H, decreases with increasing hydrogen content; the shortest dGd–Hdistance was observed to occur in GdH3. A set of powder diffraction data was obtained for GdH3.