Formation of the high pressure graphite and BC8 phases in a cold compression experiment by Raman scattering
Formation of the high pressure graphite and BC8 phases in a cold compression experiment by Raman scattering
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DOI：
10.1002/jrs.4372
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发表时间：
2013-11-01
影响因子：
2.5
通讯作者：
Ming, Li-Chung
中科院分区：
文献类型：
--
作者：
Odake, Shoko;Zinin, Pavel V.;Ming, Li-Chung
我们利用拉曼散射研究了石墨g-BC8相和石墨在高达84GPa高压下的相变。石墨的E-2g拉曼有源模式（G峰）可检测到高达84GPa。我们证明了(1)在35GPa时g-BC8和石墨中存在相变；(2)在35GPa以上，g-BC8和石墨在高压下可能完全转变为sp(3)键合的、无序的hp-BC8和hp-C相。在相变下，对G峰位置与压力数据的多项式拟合得到二次关系；在相变之上，它表现出线性行为。BC8体系与石墨在高压下的相变是可逆的。淬火hp-BC8和hp-C相具有典型的石墨相拉曼光谱。版权所有：John Wiley & Sons， Ltd。
We use Raman scattering to study phase transition in the graphitic g-BC8 phase and graphite at high pressure up to 84GPa. The E-2g Raman active mode of graphite (G peak) can be detected up to 84GPa. We demonstrate that there is (1) a phase transition in g-BC8 and in graphite at 35GPa and (2) that above 35GPa, the g-BC8 and graphite transform under high pressure to possibly fully sp(3)-bonded, disordered hp-BC8, and hp-C phases. Below the phase transition, a polynomial fit to the G peak position versus pressure data yielded a quadratic relation; above the phase transition, it demonstrates linear behavior. The phase transition at high pressure in BC8 system and graphite is reversible. Quenched hp-BC8 and hp-C phases have the Raman spectrum typical to that of the graphitic phases. Copyright (c) 2013 John Wiley & Sons, Ltd.