Characteristics of urea under high pressure and high temperature

doi:10.1088/1674-1056/ab3445

中国物理B ›› 2019, Vol. 28 ›› Issue (9): 98101-098101.doi: 10.1088/1674-1056/ab3445

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Characteristics of urea under high pressure and high temperature

Shuai Fang(房帅), Hong-An Ma(马红安), Long-Suo Guo(郭龙锁), Liang-Chao Chen(陈良超), Yao Wang(王遥), Lu-Yao Ding(丁路遥), Zheng-Hao Cai(蔡正浩), Jian Wang(王健), Xiao-Peng Jia(贾晓鹏)

State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

收稿日期:2019-01-29 修回日期:2019-05-27 出版日期:2019-09-05 发布日期:2019-09-05
通讯作者: Hong-An Ma, Xiao-Peng Jia E-mail:maha@jlu.edu.cn;jiaxp@jlu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51772120, 11604246, 51872112, and 11804305) and the Project of Jilin Science and Technology Development Plan, China (Grant No. 20180201079GX).

Characteristics of urea under high pressure and high temperature

State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

Received:2019-01-29 Revised:2019-05-27 Online:2019-09-05 Published:2019-09-05
Contact: Hong-An Ma, Xiao-Peng Jia E-mail:maha@jlu.edu.cn;jiaxp@jlu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51772120, 11604246, 51872112, and 11804305) and the Project of Jilin Science and Technology Development Plan, China (Grant No. 20180201079GX).

摘要/Abstract

摘要：

The properties of urea under high pressure and high temperature (HPHT) are studied using a China-type large volume cubic high-presentation apparatus (CHPA) (SPD-6×600). The samples are characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), and Raman spectroscopy. By directly observing the macroscopic morphology of urea with SEM, it is confirmed that the melting point of urea rises with the increase of pressure. The XRD patterns of urea residues derived under different pressures show that the thermal stability of urea also increases with the increase of pressure. The XRD pattern of the urea residue confirms the presence of C₃H₅N₅O (ammeline) in the residue. A new peak emerges at 21.80°, which is different from any peak of all urea pyrolysis products under normal pressure. A more pronounced peak appears at 708 cm^-1 in the Raman spectrum, which is produced by C-H off-plane bending. It is determined that the urea will produce a new substance with a C-H bond under HPHT, and the assessment of this substance requires further experiments.

关键词: high pressure and high temperature (HPHT), urea, thermal stability, melting point

Abstract:

Key words: high pressure and high temperature (HPHT), urea, thermal stability, melting point

中图分类号: (Diamond)

81.05.ug

07.35.+k (High-pressure apparatus; shock tubes; diamond anvil cells) 81.10.Aj (Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)

房帅, 马红安, 郭龙锁, 陈良超, 王遥, 丁路遥, 蔡正浩, 王健, 贾晓鹏. Characteristics of urea under high pressure and high temperature[J]. 中国物理B, 2019, 28(9): 98101-098101.

Shuai Fang(房帅), Hong-An Ma(马红安), Long-Suo Guo(郭龙锁), Liang-Chao Chen(陈良超), Yao Wang(王遥), Lu-Yao Ding(丁路遥), Zheng-Hao Cai(蔡正浩), Jian Wang(王健), Xiao-Peng Jia(贾晓鹏). Characteristics of urea under high pressure and high temperature[J]. Chin. Phys. B, 2019, 28(9): 98101-098101.

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Characteristics of urea under high pressure and high temperature

Characteristics of urea under high pressure and high temperature

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