巻号一覧
58 巻, 3 号
March
選択された号の論文の12件中1～12を表示しています
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研究
研究
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Masahiro Yasukawa, Yukihiro Hamada, Toshio Kono, Kazushige Ueda, Hiros ...2011 年 58 巻 3 号 p. 149-154
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスPerovskite-type BaSn1-xCoxO3-δ ceramics were prepared by a solid state reaction, and the electrical conductivity σ and Seebeck coefficient S were measured in the temperature range 373-1073 K to evaluate the thermoelectric power factors S2σ. Dense ceramics with relative densities of ∼98 % were obtained by firing at 1573 K for the BaSn1-xCoxO3-δ with x=0.03-0.15. Temperature dependence of σ and S showed that the BaSn1-xCoxO3-δ ceramics with x=0.03-0.15 were p-type semiconductors. A possible origin of the p-type conduction is hopping of holes between localized states of Co ions. The S2σ values were in the orders of 10-11-10-7 Wm-1K-2 and the highest value was 2.7×10-7 Wm-1K-2 at 1073 K for x=0.15.抄録全体を表示PDF形式でダウンロード (1087K)
研究速報
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水内 潔, 井上 漢龍, 上利 泰幸, 長岡 亨, 森貞 好昭, 杉岡 正美, 田中 基博, 武内 孝, 谷 淳一, 川原 正和, 巻野 勇 ...2011 年 58 巻 3 号 p. 155-159
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスAluminum nitride (AlN)-particle-dispersed-aluminum (Al) matrix composites were fabricated by Spark Plasma Sintering (SPS) process from the mixture of AlN powders, Al powders and Al-5mass%Si powders. The microstructures, thermal conductivities and thermal expansions of the composites fabricated were examined. These composites were all well consolidated by heating at a temperature range between 798 K and 876 K for 1.56 ks during SPS process. No reaction at the interface between the AlN particle and the Al matrix was observed by scanning electron microscopy for the composites fabricated under the sintering conditions employed in the present study. The relative packing density of the Al/AlN composite fabricated was almost 100 % in a volume fraction range of AlN between 40 % and 60 %. Thermal conductivity of the Al/AlN composite was higher than 180 W/mK at the AlN fraction range between 40 and 65 vol.%, approximately 90 % the theoretical thermal conductivity estimated using Maxwell-Eucken's equation. The coefficient of thermal expansion of the composites falls in the upper line of Kerner's model, indicating strong bonding between the AlN particle and the Al matrix in the composite.抄録全体を表示PDF形式でダウンロード (1223K) -
水内 潔, 井上 漢龍, 上利 泰幸, 長岡 亨, 森貞 好昭, 杉岡 正美, 田中 基博, 武内 孝, 谷 淳一, 川原 正和, 巻野 勇 ...2011 年 58 巻 3 号 p. 160-164
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスSiC-particle-dispersed-aluminum (Al) matrix composites were fabricated in solid-liquid co-existent state by Spark Plasma Sintering (SPS) process from the mixture of SiC powders, Al powders and Al-5mass%Si powders. The microstructures and thermal conductivities of the composites fabricated were examined. These composites were all well consolidated by heating at a temperature range between 798 K and 876 K for 1.56 ks during SPS process. No reaction at the interface between the SiC particle and the Al matrix was observed by scanning electron microscopy for the composites fabricated under the sintering conditions employed in the present study. The relative packing density of the Al/SiC composite fabricated was higher than 99 % in a volume fraction range of SiC between 40 % and 55 %. Thermal conductivity of the Al/SiC composite increased with increasing the SiC content in the composite in a volume fraction range between 40 and 50 vol.%. The highest thermal conductivity was obtained for Al-50vol.%SiC composite and reached 252 W/mK. The coefficient of thermal expansion of the composites falls in the upper line of Kerner's model, indicating strong bonding between the SiC particle and the Al matrix in the composite.抄録全体を表示PDF形式でダウンロード (1345K)
特集：炭素系機能材料
総報
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武藤 明徳2011 年 58 巻 3 号 p. 166
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスPDF形式でダウンロード (103K)
総説
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松本 里香2011 年 58 巻 3 号 p. 167-175
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスGraphite intercalation compounds (GICs) are one of the classic carbon-related materials. Inserting various atoms or molecules into the interlayer spaces of graphite leads to the formation of GICs, in which the graphite's lattice structure is preserved. Since GICs have certain attractive properties for practical materials such as high electrical conductivities, numerous studies on GICs were carried out around in the 1980's. Today, GIC research continues to be pursued. Especially, the calcium-GIC is the one of the hottest topics in the research fields of carbon material and superconductivity. Here, the fundamentals and the recent topics related to GICs are briefly reviewed.抄録全体を表示PDF形式でダウンロード (1003K)
研究
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徳江 将, 神島 謙二, 宮田 大資, 佐藤 佑樹, 柿崎 浩一, 平塚 信之, 今中 康貴, 高増 正2011 年 58 巻 3 号 p. 176-180
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスWe have prepared the carbon-based ferromagnets by pyrolytic method under high magnetic field and investigated their crystal structure and magnetic properties. The crystal structure was measured by the synchrotron X-ray diffraction experiment. The diffraction peak of a diamond was observed for the ferromagnetic samples. Thus, the carbon-based ferromagnet can be attributed to the ferromagnetic ordering of radical spins generated by defects in the diamond structure. And, the diffraction peak of a diamond of the ferromagnetic samples increased with the applied magnetic field in sample preparation. Therefore, the magnetic field may help to form a three dimensional ferromagnetic structure in the carbon-based ferromagnet. The highest magnetization was 3.0 emu/g at 300 K for the sample prepared under magnetic field at 6 T.抄録全体を表示PDF形式でダウンロード (987K) -
山本 真一郎, 中村 龍哉, 畠山 賢一, 廣瀬 美佳, 葭内 暁2011 年 58 巻 3 号 p. 181-185
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスEM-wave pyramidal-shaped absorbers produced by the traditional smoked roof-tile production process are introduced. In the smoking process, the carbon-coated layer having good electrical conductivity was formed on a dry-shaping pyramid surface made of roof tile clay. It has a superior long-term stability and thermal stability against high power incidence. In this paper, the absorption properties of the absorbers were measured. It is possible to improve the absorption property by controlling the surface resistance of the pyramids. The relationship between EM-wave absorption and surface conductivity are discussed. In addition, pyramidal-shaped absorbers in the millimeter region are developed.抄録全体を表示PDF形式でダウンロード (1266K) -
武藤 明徳, 上野 洋平, 石田 義典2011 年 58 巻 3 号 p. 186-190
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスPlatinum-porous carbon composite was prepared using a microreactor which could rapidly mix liquids. A 0.8 wt% aqueous solution of alginate acid as a raw carbon material and aqueous solutions of 0.01 M cis-PtCl2(NH3)2 and H2PtCl6 as a raw platinum material were used. These solutions were well mixed through the microreactor without stirring operation. The white yellow solid precipitated by centrifuging was carbonized in a stream of N2. Thus, the platinum-porous carbon composite material was prepared.
The specific surface area of the composite was greater with increasing of heat treatment temperature. The specific surface area was 460∼550 m2/g. In addition, the specific surface area was independent on the flow rate of the feed solutions. It was confirmed by XRD analysis that platinum in the composite was in metallic state. By EDX analysis, platinum metal was confirmed to be well dispersed highly in the porous carbon. About the content of platinum in the composite, cis-PtCl2(NH3) was significantly greater than H2PtCl6. The composite which included the 5 nm platinum particle in diameter was prepared from H2PtCl6 by heat treatment temperature at 500°C.抄録全体を表示PDF形式でダウンロード (974K) -
久米 秀樹, 長谷川 泰則, 野坂 俊紀, 中山 喜萬2011 年 58 巻 3 号 p. 191-196
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスThe morphology of the carbon nanocoils (CNCs) and their catalyst particles were characterized by a transmission electron microscope (TEM) to discuss the growth mechanism of CNCs. The catalyst particles of CNCs have many corner numbers on TEM images. This means that the catalyst particles of CNCs have several facets. In this study, the growth mechanism of CNCs was discussed at the point of the different velocities of the carbon extrusion from these facets.抄録全体を表示PDF形式でダウンロード (1695K)
本会記事
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2011 年 58 巻 3 号 p. Pref3_1
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスPDF形式でダウンロード (151K) -
2011 年 58 巻 3 号 p. MtgPr3_1-MtgPr3_21
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセスPDF形式でダウンロード (644K)
エラータ (Vol.58, No.1)
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Hiroshi Kimura, Ryoichi Shimoitani2011 年 58 巻 3 号 p. 197
発行日: 2011年
公開日: 2011/06/23
ジャーナル オープンアクセス本誌第58巻第1号に掲載の木村博氏，下井谷良信氏の研究論文につきまして，著者より訂正の申し出がありましたので、訂正しました。抄録全体を表示PDF形式でダウンロード (14K)
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