石墨
材料科学
拉曼光谱
亚稳态
正交晶系
石墨烯
相变
相(物质)
钻石
金刚石顶砧
碳纤维
衍射
结晶学
凝聚态物理
纳米技术
晶体结构
复合材料
复合数
光学
化学
物理
有机化学
作者
Ilias Efthimiopoulos,Elissaios Stavrou,Koichiro Umemoto,Sathish Mayanna,Antonius Torode,Jesse S. Smith,Stella Chariton,Vitali B. Prakapenka,A. F. Goncharov,Yuejian Wang
出处
期刊:Physical review
日期:2023-05-04
卷期号:107 (18)
被引量:1
标识
DOI:10.1103/physrevb.107.184102
摘要
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 $s{p}^{2}$- and $s{p}^{3}$-type bonding. Our experimental findings serve as direct evidence for the existence of a metastable transient modification in cold compressed carbon, lying between the $s{p}^{2}$-type graphite and ${sp}^{3}$-type diamond allotropes.
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