著者

八木 健彦

出版者

The Japan Society of High Pressure Science and Technology

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.1, no.2, pp.106-114, 1992

被引用文献数

2 2

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X-ray diffraction studies under high pressure using synchrotron radiation at the Photon Factory are reviewed. In 1983, a system named "MAX80" was constructed, which consists of a cubic anvil type high pressure vessel combined with a 500-ton hydraulic ram and a posi-tioning stage. High quality powder X-ray diffraction studies can be performed using this system in the pressure range up to 12 GPa and in the temperature range from 300 K to 1700 K. Various studies such as precise measurement of the equations of state, phase diagram, and the kinetics of the phase transformations have been carried out using this system.

著者

本田 孝志

出版者

日本高圧力学会

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.26, no.2, pp.149-156, 2016 (Released:2016-06-21)

参考文献数

28

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In this article, we introduce our recent high-pressure study on magnetism and multiferroicity in olivine-type Mn2GeO4. This compound shows successive magnetic transitions at ambient pressure and a ferroelectric ground state driven by spin-spiral order, i.e., a multiferroic state. The multiferroicity under high pressure was taken by using a recently constructed measurement system equipped with a diamond anvil cell. The pressure evolution of the magnetic structures was investigated with powder and single-crystal neutron scattering experiments using a Paris-Edinburgh press. We found that the ferroelectricity in the lowest-temperature phase disappears at 6 GPa where an incommensurate-commensurate magnetic phase transition is observed. The origin of the pressure-induced transition is discussed. Some details of the high-pressure experimental techniques will be also presented.

著者

赤浜 裕一 川村 春樹

出版者

日本高圧力学会

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.4, no.1, pp.22-27, 1995-02-20 (Released:2009-08-07)

参考文献数

18

被引用文献数

1

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By using high-energy and high-brilliant synchrotron radiation source in ESRF and PF, an angle-dispersive powder x-ray diffraction study on oxygen has been carried out up to 117 GPa at room temperature. A new highpressure structural transition was observed at 96 GPa and explained as an isostructural one with a discontinuous change of lattice constants in a monoclinic cell. Metallization for oxygen reported by S. Desgreniers et al. [1] is ascribed to the transtion.

著者

高橋 栄一

出版者

日本高圧力学会

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.25, no.4, pp.271-272, 2015 (Released:2016-01-08)

著者

山本 和貴

出版者

日本高圧力学会

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.23, no.1, pp.39-46, 2013 (Released:2013-03-09)

参考文献数

47

被引用文献数

2

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Starch gelatinizes when sufficiently heated in the presence of sufficient amount of water. Upon gelatinization, starch crystallinity is lost with the granules swollen. Depending on the botanical origin of starch, requirements for heat gelatinization may differ. Starch gelatinization can also be induced by high hydrostatic pressure. Requirements for pressure gelatinization may also differ depending on botanical origin of starch, pressure, water, and temperature. Characteristics of pressure gelatinization will be briefly reviewed as compared with heat gelatinization.

著者

若月 基 米澤 哲夫 高橋 秀明 武富 義和

出版者

日本高圧力学会

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.12, no.1, pp.50-55, 2002 (Released:2003-06-17)

参考文献数

1

被引用文献数

1

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Exploration for natural methane hydrate was carried out in the Nankai-Trough offshore Japan at a water depth of 945 m over an 88-day period, from November 1999 to February 2000. This was a national project led by the Ministry of International Trade and Industry (MITI) to seek a new energy source. It was organized by Japan National Oil Corporation (JNOC) in collaboration with Japan Petroleum Exploration Co., Ltd. as the drilling operator. The Nankai-Trough wells were drilled with a deepwater semisubmersible rig. The location was selected where BSR (Bottom Simulating Reflector) is the clearest on the seismic section. Six wells were drilled through the BSR horizon and the hydrate rich formation was confirmed between 1135 m to 1213 m BMSL (below mean sea level) by LWD data, core samples and electric logging data.

著者

Selezion A. Hambir Jens Franken Dana D. Dlott

出版者

日本高圧力学会

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.7, pp.891-896, 1998-03-03 (Released:2009-08-07)

参考文献数

18

被引用文献数

2 5

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Using a moderate energy picosecond pulse laser, 4 GPa shock waves are reproducibly generated at a high repetition rate in molecular solids. These tiny but powerful shocks are termed “nanoshocks”. Time resolved vibrational spectra with high signal to noise can be obtained using coherent anti-Stokes Raman scattering (CARS). Applications of nanoshocks in research and industry are discussed briefly. Results are presented on a molecular crystal, anthracene, and an energetic material, NTO. The temperature and pressure of the shocked material, and the risetime and velocity of the shock front are determined spectroscopically. Ultrafast material relaxation processes are investigated.

著者

寺嶋 正秀 木村 佳文 星原 悠司

出版者

日本高圧力学会

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.17, no.1, pp.4-12, 2007 (Released:2007-04-12)

参考文献数

29

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In this article, reaction volumes and pressure effects on protein reactions are discussed by means of the pulsed laser induced transient grating (TG) spectroscopy. By the TG method, temporal profile of the protein reaction volume has been determined for the non-reversible reaction process. For examples, TG studies on the photo-chemical process of carboxymyoglobin and photoactive yellow protein are introduced. The reaction volume for each process has been determined, which can not be studied by the other spectroscopic methods such as transient absorption method. A high pressure optical system, which enabled us to measure the pressure dependence of the reaction volume, has also been reported.

著者

赤石 實

出版者

日本高圧力学会

雑誌

高圧力の科学と技術 (ISSN:0917639X)

巻号頁・発行日

vol.13, no.1, pp.36-42, 2003 (Released:2003-07-15)

参考文献数

24

被引用文献数

3 4

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The synthesis of commercially available polycrystalline diamonds (hereafter PCD) with metallic and non-metallic sintering agents and their physical properties were briefly introduced. The PCD with non-metallic sintering agents such as alkaline earth carbonates had excellent heat-resistant properties, but because of the higher viscosity of molten carbonate, it is very difficult to infiltrate into the diamond layer with a grain size below 5 μm. In this article, recent advances in the synthesis of a fine-grained PCD under a static high pressure of 7.7 GPa were reviewed. Especially, experimental techniques such as sample assembly, pretreatment of natural diamond powder, etc, and sintering agents for the synthesis of PCD with a grain size from submicron to 100 nm were described.