特集-新炭素系材料- Rev. High Pressure Sci. Technol. 4-4,274-279(1995) |
フラーレンの結晶構造と相転移 Crystal Structures and Phase Transitions of Fullerenes |
斎藤 弥八 Yahachi SAITO |
Fullerenes, a new allotrope of carbon, are
hollow spherical all carbon molecules composed
of six-membered and five-membered rings.
Structural studies on C60 and C70 in the solid state at ambient and high pressure
are reviewed. Phase transitions under high
pressures are associated with molecular rotation,
orientational ordering, polymerization, and/or
crushing of molecules. Tentative p-T phase diagrams for solid C60 and C70 are given. Under appropriate pressure and
temperatures, fullerenes in the solid state
transform to polymers and diamond. Bulk moduli
at low pressures ( <1GPa)are also summarized. [fullerenes, C60, C70, crystal structure, phase transition, polymer, diamond, bulk modulus] |
〒514 三重県津市上浜町1515 三重大学工学部電気電子工学科 Mie University, Department of Electrical and Electronic Engineering, 1515 Kamihama-cho, Tsu 514 |
特集-新炭素系材料- Rev. High Pressure Sci. Technol. 4-,280-286(1995) |
B-C-N系新物質の魅力と高圧力 New Materials Based on the B-C-N Compositions and Synthesis Processes at High Pressure |
若槻 雅男 Masao WAKATSUKI |
Materials composed of light elements, such
as diamond, cubic BN, borides, carbides and
nitrides, show extreme features in mechanical,
thermal, electronic and optical properties
based on small and light atoms strongly bonded
to each other. It seems various compositions
can be realized from the same combination
of elements. It also seems that there are
still many materials left for new discovery
in this field of materials. Modern extreme
condition techniques, including static and
dynamic high pressures have revealed several
new materials with the B-C-N compositions. [diamond, cubic BN, solid solutions, light elements, periodic compounds, B-C-N-O system] |
〒305-8565 茨城県つくば市東1-1 物質工学工業技術研究所極限反応部 Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8565 |
特集-新炭素系材料- Rev. High Pressure Sci. Technol. 4-4,287-293(1995) |
電気・光機能性有機材料の高圧合成 High-Pressure Synthesis of Organic Materials for Optoelectronics |
小島 由継 Yoshitsugu KOJIMA |
New cyclic conjugated oligomers were synthesized
by reacting diphenyldiacetylene and phenylacetylene
under high pressure below 1 GPa. The optical
limiting properties of the oligomers were
investigated. At low input fluence, the transmittance
of the toluene solution obeyed the Beer-Lambert
law. Above the threshold of the input fluence,
the transmittance decreased with input fluence.
The oligomers had an optical limiting property.
Furthermore, a unique class of conjugated
compounds composed of the derivative of condensed
polycyclic aromatic compound with the phenyl
group and diphenyldiacetylene oligomer was
synthesized with appearance of a gas by annealing
of diphenyldiacetylene under elevated pressure.
The electrorheological(ER) effect of the
suspension of the compound showed the high-temperature
working limit to be at least 100℃. [high pressure, oligomer, cyclic, optical limiting, diphenydiacetylene, phenylacetylene, electrorheological effect, condensed polycyclic aromatic compound] |
〒480-1192 愛知郡長久手町大字長湫字横道41-1 竃L田中央研究所 Toyota Central Research & Development Laboratories, Inc., Nagakute-cho, Aichi-gun, Aichi 480-1192 |
特集-新炭素系材料- Rev. High Pressure Sci. Technol. 4-4,294-301(1995) |
衝撃圧縮による超高圧・超高温・超急冷法と炭素新相の探索 Producing High Pressure/High Temperature/Rapid Quenching Condition and Exploring New Phases of Carbon by Shock Compression |
近藤 建一1 平井 寿子2 Ken-ichi KONDO, Hisako HIRAI |
Recent trends in shock compression research
and essential points of view are briefly
reviewed. Such aspects have led to the development
of SCARQ(Shock Compression and Rapid Quenching) method for exploring new materials,
especially carbon. Some examples of new carbon
phases and applications to investigating
the transition mechanism from graphite to
diamond are also reviewed in order to verify
the SCARQ method. [shock compression, rapid quenching, shock chemistry, high pressures and high temperatures, carbon, diamond, new materials] |
1〒226-8503 横浜市緑区長津田町4259 東京工業大学応用セラミックス研究所 Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503 2〒305-8571 つくば市天王台1-1-1 筑波大学地球科学系 |
特集-新炭素系材料- Rev. High Pressure Sci. Technol. 4-4,302-307(1995) |
非金属触媒を助剤とするダイヤモンドの焼結 Sintering of Diamond Using Non-metallic Catalyst as a Sintering Agent |
赤石 實 Minoru AKAISHI |
Synthesis of polycrystalline diamond compact(PCD)
with high heat resistant properties is a
big challenge for specialized abrasive application
such as in cutting tools, in rock drills
etc. The present paper reviews the sintering
behavior of natural diamond powder-magnesium
carbonate system under the conditions of
7.7 GPa and 1850-2450℃ and its thermal resistant
properties. Neither graphitization nor crackings
were observed either in or on the compact
after the heat treatment between 900〜1400℃
for 30 min in vacuum. PCD after the treatment
at 1400℃ had a high hardness of 55 GPa in
Knoop hardness scale. This result suggests
that magnesium carbonate is a superior additive
for synthesis of PCD with high heat resistant
properties. [sintered diamond, magnesium carbonate, heat resistant property, high-pressure and high-temperature] |
〒305-0044 茨城県つくば市並木1-1 無機材質研究所 National Institute for research in Inorganic Materials, 1-1 Namiki, Tsukuba-shi Ibaraki, 305-0044 |
特集-新炭素系材料- Rev. High Pressure Sci. Technol. 4-4,308-314(1995) |
高純度ダイヤモンド単結晶の合成 Synthesis of High Purity Diamond Single Crystal |
佐藤 周一 角谷 均 Shuichi SATOH, Hitoshi SUMIYA |
This paper presents the outline of the temperature
gradient method at high pressures and
high
temperatures for the epitaxial growth
of
a high purity diamond single crystal.
Several
elimination techniques of the impurities
(mainly nitrogen atoms) in a single
crystal
are discussed. High purity diamond
single
crystals, containing impurities as
low as
0.1 ppm, are successfully grown up
to 1 or
2 carats by adding titanium and copper
in
the solvent bath in the temperature
gradient
method. In order to reduce the nitrogen
content
of a solvent bath, titanium is added
as a
nitrogen getter, while copper is added
to
decompose titanium-carbide which is
contained
in a crystal as bulky inclusion by
adding
of titanium. [synthetic diamond crystal, high purity diamond crystal, type IIa diamond, high pressure and high temperature method, temperature gradient method] |
〒664-0016 兵庫県伊丹市昆陽北1-1-1 住友電気工業(株)
伊丹研究所 Itami Research Laboratories, Sumitomo Electric Industries Ltd. 1-1-1 Koya-Kita,Itami,Hyogo, 664-0016 |
解説 Rev. High Pressure Sci. Technol. 4-4,315-321(1995) |
量子スピン梯子化合物−1次元から2次元へのクロスオーバー− Quantum Spin Ladder Compounds -Crossover from One to Two Dimensionality- |
高野 幹夫 Mikio TAKANO |
Theoretical and experimental aspects of a
class of new cupric oxides called spin ladder
compounds will be summarized, where the ladders
are made from antiferromagnetic chains of
S = 1/2 spins by connecting them together
with inter-chain antiferromagnetic bonds.
Hole carriers doped into even-leg ladders
have been predicted to pair, and possibly
superconduct. By means of high pressure synthesis
at 3-6 GPa and 1200 K, typically, two kinds
of 2-leg ladder compounds SrCu2O3 and LaCuO2.5 and a 3-leg ladder compound Sr2Cu3O5 have been prepared. Their magnetic and electrical
properties will be compared with theoretical
predictions. [high-Tc superconductivity, cupric oxides, spin ladder, dimensional crossover, high pressure synthesis] |
〒611-0011 京都府宇治市五ケ荘 京都大学化学研究所無機素材化学研究部門V Institute for Chemical Research, Kyoto University, Gokasho, Kyoto 611-0011 |
実験ワンポイント Rev. High Pressure Sci. Technol. 4-4,322-323(1995) |
クランプ式DACのための簡易Ar液化装置 An Apparatus for Condensing Ar in a Clamp-Type Diamond Anvil Cell |
松田 康弘1 黒田 規敬2 Yasuhiro MATSUDA, Noritaka KURODA |
A simple apparatus for condensing argon in
a clamp-type diamond anvil cell is reported.
This apparatus enables us to conveniently
use condensed argon as the pressure-transmitting
medium. [condensed argon, clamp-type DAC, pressure-transmitting medium, low temperature] |
1 〒277-8581 柏市柏の葉5-1-5 東京大学物性研究所三浦研究室 Tokyo University, 5-1-5, Kashiwanoha Kashiwa 277-8581 2 〒860-8555 熊本市黒髪2-39-1 熊本大学工学部知能生産システム工学科 Kumamoto University 2-39-1 Kurokami, Kumamoto 860-8555 |
実験ワンポイント Rev. High Pressure Sci. Technol. 4-4,324-326(1995) |
流体および混合流体の臨界定数の精密測定 Precise Measurement of Critical Parameters for Fluids and Fluid Mixtures |
山田 研治1 中島 誠之 末廣 能史 上松 公彦2 Kenji YAMADA, Masayuki NAKAJIMA, Yoshifumi SUEHIRO, Masahiko UEMATSU |
An experimental apparatus for precise measurement
of the critical parameters for fluids and
fluid mixtures is described in detail. The
apparatus can be used in the temperature
range from 250 to 500 K at pressures up to
100 MPa. [critical parameters, fluids and fluid mixtures, optical cell, volumometer] |
1〒554-0051 大阪市此花区酉島6-19-9 大阪ガス(株)開発研究部エネルギー技術研究センター 2〒223-8522 横浜市港北区日吉3-14-1 慶應義塾大学大学院理工学研究科機械工学専攻 Department of Mechanical Engineering, Keio University, Hiyoshi, 3-14-1, Kohoku-ku, Yokohama 223-8522 |
〒606-0805
京都市左京区下鴨森本町 15 (財)生産開発科学研究所内
日本高圧力学会事務局
Tel (075)721-0376 Fax (075)723-9629
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