一种新的氮化碳相的冲击波合成

刘建军; 关根利守; 小林敬道

doi:10.11858/gywlxb.2006.01.005

一种新的氮化碳相的冲击波合成

doi: 10.11858/gywlxb.2006.01.005

1.
北京化工大学理学院，北京 100029；
2.
国立材料科学研究所先进材料实验室，日本筑波 305-0044

详细信息

通讯作者:
刘建军

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出版历程
- 收稿日期: 2005-09-09
- 修回日期: 2005-11-17
- 发布日期: 2006-03-05

A New Carbon Nitride Phase Synthesized by Shock Compression

1.
Faculty of Sciences, Beijing University of Chemical Technology, Beijing 100029, China;
2.
Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

More Information

Corresponding author: LIU Jian-Jun

摘要

摘要: 为了合成理论预测存在的高密度氮化碳相，以富氮的C-N-O非晶材料和晶态的双氰胺为前体，在低于50 GPa的冲击压力范围内进行了一系列冲击回收实验。回收产物的XRD衍射表明，形成了由-C3N4和一种新的氮化碳相组成的复合相。该新相的衍射峰可以完全指标化为一个单斜晶胞，晶胞常数为a=0.981 nm，b=0.723 nm，c=0.561 nm，=95.2，晶胞体积Vcell=0.396 6 nm3。根据实验结果可以认为，氮化碳复合相的形成是前体有机分子在瞬态的冲击波化学反应后，经历了极高速的冲击淬火过程（约109 K/s），作为一种高压亚稳相而被保存下来。冲击压缩富氮的有机物前体，是合成氮化碳相的一种新方法。
- 氮化碳 /
- 冲击波合成 /
- 亚稳相
Abstract: To synthesize a carbon nitride with high density existing by theoretical prediction, a series of shock recovery experiments up to 50 GPa were carried out on two nitrogen-rich materials of a C-N-O amorphous precursor and dicyandiamide. The powder X-ray diffractions (XRD) of recovered samples show that the carbon nitride composite phases are formed consisting of -C3N4 and a new crystalline phase. The new phase is indexed as a monoclinic cell with a=0.981 nm, b=0.723 nm, c=0.561 nm, =95.2, and Vcell=0.396 6 nm3. We considered that this new phase is formed to survive as metastable species by extremely high quenching rate (109 K/s) after transient shock-induced reaction of these organic precursors and so shock compression may provide a novel synthesis route for various carbon nitride phases from appropriate rich-nitrogen organic materials.
- carbon nitride /
- shock wave synthesis /
- metastable phases

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参考文献(16)

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