Raman, infrared, and x-ray evidence for new phases of nitrogen at high pressures and temperatures
Raman, infrared, and x-ray evidence for new phases of nitrogen at high pressures and temperatures
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DOI：
10.1103/physrevb.66.224108
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发表时间：
2002-12-01
影响因子：
3.7
通讯作者：
Shen, GY
中科院分区：
文献类型：
--
作者：
Gregoryanz, E;Goncharov, AF;Shen, GY
用拉曼散射、红外吸收和粉末同步X射线衍射法研究了高温高压下固体氮分子相的存在和表征。最值得注意的是一种具有强烈分子间相互作用和红外振动吸收的相(Theta)。第二个较低压力相(IOTA)是双原子的，分子在方向上是等价的。这两个相都可以淬火到室温，并在20~100 Gpa和30~1000K的宽P-T范围内观察到。结果表明，在高压和高温下，氮的相关系得到了重大修正。
We report the existence and characterization of a distinct class of molecular phases of solid nitrogen at high pressures and temperatures by Raman scattering, infrared absorption, and powder synchrotron x-ray diffraction. The most remarkable is a phase (theta) which is characterized by strong intermolecular interactions and infrared vibron absorption. A second lower-pressure phase (iota) is diatomic with orientationally equivalent molecules. Both phases can be quenched to room temperature and are observed over a wide P-T range from 20 to 100 GPa and 30 to 1000 K. The results suggest a major revision of the phase relations of nitrogen at high pressures and temperatures.