Effect of Dose and Pressure on the Transformation from Neutron-Irradiated Graphite to Amorphous Diamond
Effect of Dose and Pressure on the Transformation from Neutron-Irradiated Graphite to Amorphous Diamond
复制标题
剂量和压力对中子辐照石墨向非晶态金刚石转变的影响
DOI：
10.1088/1742-6596/377/1/012026
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
and T. Iwata
中科院分区：
文献类型：
--
作者：
K. Niwase;T Atou;K G Nakamura;and T. Iwata
我们以前发现了一种新的途径，可以将中子辐照的高取向热解石墨片转变为非晶态金刚石片。在这里，我们使用了经中子剂量约为先前研究的一半照射的石墨箔，并确认了转化的途径。辐照后的石墨的拉曼光谱表现为宽广的非晶态，但仍有较弱的G峰和D峰，呈现较少的无序态。辐照后的石墨箔在46、51和54 Gpa的压力下进行冲击压缩。在46 GPa处，拉曼光谱清晰地显示出G峰和D峰，但出现了微弱的光致发光。在51 GPa处，我们发现透明的小片有强烈的光致发光，但没有金刚石的拉曼峰，这意味着向非晶态金刚石的转变。在54 GPa时，我们得到了具有强烈光致发光的透明小片和一个小而宽的钻石峰，这表明纳米金刚石的形成。
We previously discovered a novel pathway for the transformation from highly orientated pyrolytic graphite foils irradiated with neutrons into amorphous diamond platelets. Here, we utilized graphite foils irradiated with a neutron dose of about a half of the previous study, and confirmed the pathway for the transformation. Raman spectrum of the irradiated graphite exhibits a broad amorphous one but still possessed weak G and D peaks, appearing in a less disordered state. The irradiated graphite foils were shock compressed at 46, 51 and 54 GPa. At 46 GPa, Raman spectra clearly show the G and D peaks but a weak photoluminescence appears. At 51 GPa, we can find transparent platelets with intense photoluminescence but no diamond Raman peak, implying the transformation to amorphous diamond. At 54 GPa, we obtained transparent platelets with intense photoluminescence and a small and broad diamond peak, suggesting the formation of nano-diamond.