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Journal Articles

Macroscopic Separation of Dense Fluid Phase and Liquid Phase of Phosphorus

Katayama, Yoshinori; Inamura, Yasuhiro*; Mizutani, Takeshi*; Yamakata, Masaaki*; Utsumi, Wataru; Shimomura, Osamu*

Science, 306(5697), p.848 - 851, 2004/10

 Times Cited Count:131 Percentile:96.32(Multidisciplinary Sciences)

Structural transformation between two liquid structures of phosphorus that occurred at about 1 GPa and 1000$$^{circ}$$C was investigated by in-situ X-ray radiography. When the low-pressure liquid was compressed, dark and round objects appeared in the radiograph. X-ray diffraction measurements confirmed that these objects were the high-pressure liquid. The drops grew and eventually filled the sample space. Decompressing caused the reverse process. The macroscopic phase separation supported the view that it was a first-order liquid-liquid phase transition. X-ray absorption measurements revealed that the change in density at the transition is about 40 % of the density of the high-pressure liquid.

Journal Articles

In situ X-ray observations of the decomposition of brucite and the graphite-diamond conversion in aqueous fluid at high pressure and temperature

Okada, Taku; Utsumi, Wataru; Kaneko, Hiroshi*; Yamakata, Masaaki*; Shimomura, Osamu

Physics and Chemistry of Minerals, 29(7), p.439 - 445, 2002/08

 Times Cited Count:15 Percentile:51.27(Materials Science, Multidisciplinary)

An experimental technique to make real-time observations at high pressure and temperature of the diamond forming process in candidate material of mantle fluids as a catalyst has been established for the first time. In situ X-ray diffraction experiments using synchrotron radiation have been performed upon a mixture of brucite (Mg(OH)$$_{2}$$) and graphite as starting material. Brucite decomposes into periclase (MgO) and H$$_{2}$$O at 3.6 GPa and 1050$$^{circ}$$C while no periclase is formed after the decomposition of brucite at 6.2 GPa and 1150$$^{circ}$$C, indicating that the solubility of the MgO component in H$$_{2}$$O greatly increases with increasing pressure. The conversion of graphite to diamond in aqueous fluid has been observed at 7.7 GPa and 1835$$^{circ}$$C. Time-dependent X-ray diffraction profiles for this transformation have been successfully obtained.

Journal Articles

Transport channels of X-ray beamlines at SPring-8

Goto, Shunji*; Ohashi, Haruhiko*; Takeshita, Kunikazu*; Yabashi, Makina*; Yamakata, Masaaki*; Asano, Yoshihiro; Ishikawa, Tetsuya*

Nuclear Instruments and Methods in Physics Research A, 467-468(Part1), p.813 - 815, 2001/07

 Times Cited Count:3 Percentile:28.55(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Second-order phase transition of FeS under high pressure and temperature

Kusaba, Keiji*; Utsumi, Wataru; Yamakata, Masaaki*; Shimomura, Osamu; Shono, Yasuhiko*

Journal of Physics and Chemistry of Solids, 61(9), p.1483 - 1487, 2000/09

 Times Cited Count:6 Percentile:37.58(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

In situ X-ray diffraction experiments under high pressures and high temperatures at BL14B1 beamline

Utsumi, Wataru; Katayama, Yoshinori; Mizutani, Takeshi; Shimomura, Osamu; Yamakata, Masaaki*; Azuma, Masaki*; Saito, Takashi*

Nihon Kessho Gakkai-Shi, 42(1), p.59 - 67, 2000/02

no abstracts in English

Journal Articles

A First-order liquid-liquid phase transition in phosphorus

Katayama, Yoshinori; Mizutani, Takeshi*; Utsumi, Wataru; Shimomura, Osamu; Yamakata, Masaaki*; Funakoshi, Kenichi*

Nature, 403(6766), p.170 - 173, 2000/01

 Times Cited Count:710 Percentile:98.04(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

A New cubic anvil press with radial slit system at the SPring-8

Yamakata, Masaaki*; Mizutani, Takeshi; Utsumi, Wataru; Katayama, Yoshinori; Shimomura, Osamu

Science and Technology of High Pressure (Proceedings of AIRAPT-17), p.1109 - 1112, 2000/00

no abstracts in English

Journal Articles

Anomaly in the melting curve of black phosphorus associated with a liquid-liquid transition

Mizutani, Takeshi; Katayama, Yoshinori; Utsumi, Wataru; Funakoshi, Kenichi*; Yamakata, Masaaki*; Shimomura, Osamu

Science and Technology of High Pressure (Proceedings of AIRAPT-17), p.525 - 528, 2000/00

no abstracts in English

Journal Articles

SPring-8 beamlines for high pressure science with multi-anvil apparatus

Utsumi, Wataru; Funakoshi, Kenichi*; Urakawa, Satoru*; Yamakata, Masaaki*; Tsuji, Kazuhiko*; Konishi, Hiroyuki; Shimomura, Osamu

Review of High Pressure Science and Technology, 7, p.1484 - 1486, 1998/00

no abstracts in English

Journal Articles

New Polymorph of SiO$$_{2}$$ formed under Quasi-hydrostatic compression of cristobalite

Yamakata, Masaaki*; Yagi, Takehiko*

Review of High Pressure Science and Technology, 7, p.107 - 109, 1998/00

no abstracts in English

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