Pressure-Induced Phase Transition in N鈥揌路路路O Hydrogen-Bonded Molecular Crystal Oxamide

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• 作者：Tingting Yan ; Shourui Li ; Kai Wang ; Xiao Tan ; Zhangmei Jiang ; Ke Yang ; Bingbing Liu ; Guangtian Zou ; Bo Zou
• 刊名：The Journal of Physical Chemistry B
• 出版年：2012
• 出版时间：August 16, 2012
• 年：2012
• 卷：116
• 期：32
• 页码：9796-9802
• 全文大小：567K
• 年卷期：v.116,no.32(August 16, 2012)
• ISSN：1520-5207

文摘

The effect of high pressure on the structural stability of oxamide has been investigated in a diamond anvil cell by Raman spectroscopy up to 14.6 GPa and by angle-dispersive X-ray diffraction (ADXRD) up to 17.5 GPa. The discontinuity in Raman shifts around 9.6 GPa indicates a pressure-induced structural phase transition. This phase transition is confirmed by the change of ADXRD spectra with the symmetry transformation from P1̅ to P1. On total release of pressure, the diffraction pattern returns to its initial state, implying this transition is reversible. We discuss the pressure-induced variations in N鈥揌 stretching vibrations and the amide modes in Raman spectra and propose that this phase transition is attributed to the distortions of the hydrogen-bonded networks.