High-pressure phase of cold-compressed bulk graphite and graphene nanoplatelets
High-pressure phase of cold-compressed bulk graphite and graphene nanoplatelets
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DOI：
10.1103/physrevb.107.184102
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发表时间：
2023-05
影响因子：
3.7
通讯作者：
I. Efthimiopoulos;E. Stavrou;K. Umemoto;S. Mayanna;A. Torode;Jesse S. Smith;S. Chariton;V. Prakapenka;A. Goncharov;Yuejian Wang
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文献类型：
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作者：
I. Efthimiopoulos;E. Stavrou;K. Umemoto;S. Mayanna;A. Torode;Jesse S. Smith;S. Chariton;V. Prakapenka;A. Goncharov;Yuejian Wang
我们用高压拉曼光谱和X射线衍射仪研究了块体石墨和石墨烯纳米片在室温下的高压振动和结构行为。我们在两种材料中都检测到了明显的压力诱导结构转变，新的布拉格峰和拉曼特征的出现证明了这一点，偏离了开始的六方石墨结构。高压相为部分无序的斜方结构，由混合型成键组成。我们的实验结果直接证明了冷压缩碳中存在介于石墨型和金刚石同素异形体之间的亚稳态瞬变修饰。
We have studied the high-pressure vibrational and structural behavior of bulk graphite and graphene nanoplatelets at room temperature by means of high-pressure Raman spectroscopic and x-ray diffraction probes. We have detected a clear pressure-induced structural transition in both materials, evidenced by the appearance of new Bragg peaks and Raman features, deviating from the starting hexagonal graphitic structure. The high-pressure phase is identified as a partially disordered orthorhombic structure, consisting of mixed- and-type bonding. Our experimental findings serve as direct evidence for the existence of a metastable transient modification in cold compressed carbon, lying between the-type graphite and-type diamond allotropes.