High pressure synchrotron x-ray diffraction and Raman scattering studies of ammonium azide
High pressure synchrotron x-ray diffraction and Raman scattering studies of ammonium azide
复制标题
叠氮化铵的高压同步辐射X射线衍射和拉曼散射研究
DOI：
10.1063/1.4798336
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发表时间：
2013-03-25
影响因子：
4
通讯作者：
Cui, Qiliang
中科院分区：
文献类型：
--
作者：
Wu, Xiaoxin;Cui, Hang;Cui, Qiliang
本文用高压X射线衍射和室温下的拉曼散射研究了叠氮化铵（NH_4N_3）。NH_4N_3在压缩过程中表现出较强的氢键作用。随着压力的增加，由于N-H. N键的弯曲，氢键减弱，导致叠氮阴离子在2b和4 h维科夫位置的N-H伸缩频率和转动频率增加，直至2.9 GPa.叠氮阴离子的取向明显影响NH 4 N3的压缩性能。的相变涉及旋转的叠氮阴离子和接近的a和c，时间分配作为一个可逆的二阶正交到tetrahombic过渡。
Ammonium azide (NH4N3) has been studied by in situ high-pressure X-ray diffraction and Raman scattering at room temperature. NH4N3 exhibits strong hydrogen bonding features with compression. The hydrogen bond weaken with increasing pressure due to the bending of N−H…N bond, leading to the increase of N−H stretch frequency and rotation of azide anions at 2b and 4h Wyckoff positions up to 2.9 GPa. The orientation of azide anions obviously influences the compressibility properties of NH4N3. The phase transition involves rotation of azide anions and a proximity of a and c, temporally assigned as a reversible second-order orthorhombic-to-tetragonal transition.