[2P01-53] Poster Presentation

[2P11] Synthesis of compressed graphite by high-pressure and high-temperature treatments of neutron-irradiated highly oriented pyrolytic graphite and characterization of its structural and electronic properties

*Takashi Kitazume¹, Takumi Tokunaga¹, Yuji Higo², Yohei Sato³, Keisuke Niwase⁴, Masato Niibe⁵, Shin-ichi Honda¹ (1. Graduate School of Engineering, University of Hyogo, 2. Japan Synchrotron Radiation Research Institute, 3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 4. Hyogo University of Teacher Education, 5. The Institute for Solid State Physics, The University of Tokyo)

The purpose of this study is to clarify the effect of irradiation defects on structural changes in n-HOPG under high pressure and high temperature by utilizing in-situ XRD and TEM-EELS to elucidate the formation mechanism of stable compressed graphite. The compressed graphite was synthesized by high-pressure and high-temperature treatments of n-HOPG and un-irradiated HOPG at 15 GPa and 1500℃. The structural and electronic properties of the specimen were subsequently characterized by TEM-EELS, suggesting the formation of compressed graphite and the presence of a slight sp²-σ* component, unlike graphite.