Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Hiroaki Ohfuji"'
Publikováno v:
Doklady Earth Sciences. 497:227-231
An inclusion of graphite in zircon from the diamond- and tourmaline-bearing rocks of the Kokchetav massif (Northern Kazakhstan) has been studied. The inclusion, associated with diamond crystals, was identified within the marginal part of the zircon g
Publikováno v:
Journal of Mineralogical and Petrological Sciences. 116:203-210
Publikováno v:
Journal of the European Ceramic Society. 38:2815-2822
Using a turbostratic pyrolytic boron nitride as a starting material, we synthesized a variety of ultrahard polycrystalline cubic boron nitride (PcBN) as a function of the heating duration changing from 1 to 60 min under a constant temperature and pre
Autor:
Christopher Giehl, Ulrich Schürmann, Atsunobu Masuno, Norimasa Nishiyama, Tetsuo Irifune, Astrid Holzheid, Nico Alexander Gaida, Lorenz Kienle, Oliver Beermann, Jozef Bednarcik, Eleonora Kulik, Hiroaki Ohfuji
Publikováno v:
Journal of the American Ceramic Society. 101:998-1003
Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite (91.4 vol%) and Al2O3 corundum (8.6 vol%) were fabricated at 10 GPa and 1200-1400°C. These materials were obtained by direct conversion from Al2O3-SiO2 glasses fabricat
Publikováno v:
Diamond and Related Materials. 77:25-34
Using a turbostratic pyrolytic boron nitride produced by a chemical vapor deposition process as a starting material, we conducted experiments for synthesizing polycrystalline cubic boron nitride (PcBN) at a temperature of 1600–2600 °C and pressure
Autor:
Alexander P. Yelisseyev, Hiroaki Ohfuji, Motosuke Nakaya, V. P. Afanasiev, Konstantin D. Litasov
Publikováno v:
Journal of Mineralogical and Petrological Sciences. 112:46-51
Autor:
Ryo Ishikawa, Hidehiro Yoshida, Fumihiro Wakai, Yuichi Ikuhara, Hauke Marquardt, Norimasa Nishiyama, Eleonora Kulik, Atsunobu Masuno, Alexander Kurnosov, Hiroaki Ohfuji, Takashi Taniguchi, Tetsuo Irifune, Jozef Bednarcik, Byung-Nam Kim
Publikováno v:
Scientific Reports
Scientific reports 7, 44755 (2017). doi:10.1038/srep44755
Scientific reports 7, 44755 (2017). doi:10.1038/srep44755
Scientific reports 7, 44755 (2017). doi:10.1038/srep44755
Glasses and single crystals have traditionally been used as optical windows. Recently, there has been a high demand for harder and tougher optical windows that are able to endure severe c
Glasses and single crystals have traditionally been used as optical windows. Recently, there has been a high demand for harder and tougher optical windows that are able to endure severe c
Publikováno v:
Journal of Nanomaterials, Vol 2013 (2013)
A new type of polycrystalline sintered diamond has been successfully synthesized by direct conversion from highly oriented pyrolytic graphite at 15 GPa and 2300°C. It is optically transparent and consists entirely of layered nanocrystals (50–100 n
Autor:
Futoshi Isobe, Hitoshi Sumiya, Takehiro Kunimoto, Kazuo Komatsu, Tetsuo Irifune, Shinsuke Okimoto, Hiroaki Ohfuji
Publikováno v:
Physics and Chemistry of Minerals. 39:543-552
Nano-polycrystalline diamond (NPD) is a super-hard pure polycrystalline aggregate of nano-diamonds and has a characteristic microtexture composed of a mixture of granular and lamellar crystals. We investigated the origin of the unique microtexture an
Publikováno v:
Diamond and Related Materials. 19:1040-1051
Micrometer- to nanometer-scale structures of the cut surfaces of single- and polycrystalline diamonds by a pulsed ultraviolet laser have been thoroughly investigated by scanning and transmission electron microscopy. Within the laser-cut grooves, the