Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Hiroaki Ohfuji"'
Autor:
Hideaki Kawamura, Hiroaki Ohfuji
Publikováno v:
High Pressure Research. 40:162-174
Here we report a novel route for synthesizing nano-polycrystalline diamond (NPD) using stearic acid (C18H36O2) as a starting material under high pressure and high temperature. The obtained NPD show...
Publikováno v:
High Pressure Research. 40:96-106
Nano-polycrystalline diamond (NPD) with various grain sizes has been synthesized from glassy carbon at pressures 15–25 GPa and temperatures 1700–2300°C using multianvil apparatus. The minimum tempe...
Autor:
Tetsuo Irifune, Toru Shinmei, Fumitaro Ishikawa, Hiroaki Ohfuji, Mitsuru Funato, Rei Fukuta, Masafumi Matsushita, Yoichi Kawakami, Ryota Ishii
Publikováno v:
High Pressure Research. 40:140-147
Deep-ultraviolet continuous-wave photoluminescence spectroscopy is performed for nano-polycrystalline diamond (NPD) synthesized by a high pressure high-temperature technique. NPD exhibits clear dee...
Autor:
Norimasa Nishiyama, Timothy Officer, Tetsuo Irifune, Feng Shi, Yanbin Wang, Toru Shinmei, Tony Yu, Hiroaki Ohfuji, Julien Gasc
Publikováno v:
High Pressure Research. 40:35-53
The use of nanopolycrystalline diamond has allowed a systematic study on deformation of polycrystalline diamond composites (PCDCs). Bulk PCDCs samples containing either Co or SiC as a binding agent...
Autor:
Naohisa Hirao, Katsuya Shimizu, Toshiki Hamatani, Ryosuke Takeda, Takehiro Kunimoto, Naoki Ishimatsu, Takeshi Sakai, Keitaro Kuramochi, Hiroaki Ohfuji, Hirokazu Kadobayashi, Takehiko Yagi, Tetsuo Irifune, Yuki Nakamoto, Saori I. Kawaguchi, Hideto Mimori, Yasuo Ohishi
Publikováno v:
High Pressure Research. 40:12-21
Both micro-paired and conical support type double-stage diamond anvil cells (ds-DAC) were tested using a newly synthesized ultra-fine nano-polycrystalline diamond (NPD). Well-focused X-ray sub-micr...
Publikováno v:
High Pressure Research. 39:561-578
We present experimental results on melting and subsolidus phase relations in the Ni–Ni2P system at 6 GPa and 900–1600°C. The system has four stable phosphides: Ni3P nickelphosphide, Ni8P3/N...
Publikováno v:
High Pressure Research. 39:50-68
Here, we report experimental results on melting and subsolidus phase relations in the Fe–Fe2P system at 6 GPa and 900–1600°C. The system has two P-bearing compounds: Fe3P and Fe2P. X-ray di...
Autor:
Takehiro Kunimoto, Yasuo Ohishi, Hirokazu Kadobayashi, Tetsuo Irifune, Takehiko Yagi, Shigehiko Tateno, Takeshi Sakai, Hiroaki Ohfuji, Naohisa Hirao, Kei Hirose, Saori Kawaguchi-Imada
Publikováno v:
High Pressure Research. 38:107-119
We have developed a double stage diamond anvil cell (ds-DAC) technique for reproducible pressure by precisely fabricating 2nd stage anvils using a focused ion beam system. We used 2nd stage micro-a...
Autor:
Tomohiko Hisakuni, Keisuke Niwase, Toru Shinmei, Shin-ichi Honda, Yuji Higo, Tetsuo Irifune, Tadao Iwata, Mititaka Terasawa, Masahito Niibe, Hiroaki Ohfuji
Publikováno v:
Diamond and Related Materials. 82:132-136
Highly oriented pyrolytic graphite (HOPG) is a unique source material for the synthesis of new types of diamond. It can transform to layered nano-polycrystalline diamond (NPD) under static high pressure and high temperature (HPHT) and to “amorphous
Autor:
Hiroaki Ohfuji
Publikováno v:
Nihon Kessho Gakkaishi. 60:9-16