A study on the direct transformation to amorphous diamond by piling up non-equilibrium processes

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06440
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Inorganic materials/Physical properties
• Research Institution: Hyogo University of Teacher Education
• Principal Investigator: Keisuke Niwase 兵庫教育大学, 学校教育研究科, 教授 (50198545)
• Co-Investigator(Renkei-kenkyūsha): HONDA Shin-ichi 兵庫県立大学, 工学部, 教授 (90324821) ; Ohfuji Hiroaki 愛媛大学, 地球深部ダイナミック研究センター, 教授 (80403864)
• Project Period (FY): 2015-10-21 – 2018-03-31
• Keywords: ダイヤモンド / 黒鉛 / 圧縮黒鉛 / 高圧高温 / 変換 / 照射欠陥

Outline of Final Research Achievements

We have so far been discovered the transformation from neutron-irradiated highly oriented pyrolytic graphite (HOPG) to amorphous diamond. Here, we have investigated the change of the neutron-irradiated HOPG under high pressure in high temperature (HPHT) condition. At 2300℃/15GPa, we observed transformation to a polycrystalline diamond. At 1500℃/15GP, we observed the formation of compressed graphite. The structural changes are considered to originate in some effect of neutron irradiation-induced defects.

Free Research Field

材料工学