巻号一覧
58 巻, 9 号
September
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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Masatomo Hattori, Masaaki Haneda, Masakuni Ozawa2011 年 58 巻 9 号 p. 511-515
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスWe investigated the morphology, temperature programmed reduction (TPR) and oxygen storage capacity (OSC) of Pt-added CeO2 on alumina. The effect of heat treatment on interaction and microstructure of Pt and CeO2 on alumina was investigated by the comparison of the peak temperature in the TPR profiles as well as the improvement of OSC by Pt addition. The active interaction of Pt and CeO2 appeared as the TPR peak at 160°C but degenerated by the sintering of Pt after heat treatment at 1000°C. After the atomistic interaction of Pt/CeO2 is destroyed by high-temperature treatment, the oxygen is released via the diffusion on the surface to react with hydrogen on Pt at around 260°C. The Pt/CeO2 site become inactive because of sintering of Pt particles, and then the OSC was weakened.抄録全体を表示PDF形式でダウンロード (656K) -
Atsushi Hibino, Yutaro Shiraishi2011 年 58 巻 9 号 p. 516-523
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスIn recent years, with increasing of a demand of alloyed steel powder, knowledge of gas release behavior has been required to improve the quality of the produced material. In this paper, the gas release behavior from Fe powder, Fe-Cr powder, Fe-Ni powder, and Fe-Cr-Ni powder during heating in pure He gas were investigated by a gas chromatography analyzer. CO2, H2O, and C3H8 gases were detected from the powders. Especially, in Fe powder and Fe-Ni powder, CO2 gas was remarkably released over 600°C. H2O gas generation was detected from Fe-Ni powder and Fe-Cr-Ni powder in temperature range of 200-600°C. The amount of CO2 gas in Fe powder and Fe-Ni powder was clearly higher than that in Fe-Cr powder and Fe-Cr-Ni powder. Additionally, the amount of H2O gas in Fe-Ni powder and Fe-Cr-Ni powder was also higher than that in Fe powder and Fe-Cr powder. Precisely, it was guessed that CO2 gas release behavior depended on the Cr component in the alloyed steel powder, and that H2O gas release behavior rerated with Ni component. As comparative experiments, the gas release behavior of pure Cr powder, pure Ni powder, and NiO powder were studied. Furthermore, for the alloyed steel powder mixed with carbon powder, and for the alloyed steel powder treated in steam vapor, the amount of gas release were measured. From these investigations, the effects of Cr and Ni components against the gas release behavior of the alloyed steel powder were discussed in this paper.抄録全体を表示PDF形式でダウンロード (1195K) -
世利 修美, 矢崎 風太朗, 長船 康裕2011 年 58 巻 9 号 p. 524-528
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスAttempts have been made to obtain MgFe2O4 powder by magnesium corrosion approach with refluxing process at 333 K making use of anhydrous ethanol as a solvent and ferric chloride as a catalyst for a period of 7.2 ks. The mixture of corrosion products was sintered at more than 1273 K for 7.2 ks, a few micron size MgFe2O4 particles have been identified by XRD analysis and SEM observation. From the electrochemical point of view, the preparation of MgFe2O4 powder was explained as a corrosion product of magnesium and by the stimulation of corrosion reaction by addition of ferric chloride.抄録全体を表示PDF形式でダウンロード (1382K) -
團野 瑛章, 草野 圭弘, 浅岡 裕史, 中西 真, 藤井 達生, 池田 靖訓, 高田 潤2011 年 58 巻 9 号 p. 529-534
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスFormation mechanism of β-Fe2O3 particles was investigated by controlling the preparation conditions such as the mixing ratio of NaFe(SO4)2 and Na3Fe(SO4)3 to NaCl and the heat treatment temperature. The heat treatment temperature strongly affected the particle shapes and sizes. β-Fe2O3 was found to be formed by two different reactions; one is a solid state reaction below 490 °C, and another is a liquid phase-mediated reaction above 490 °C. β-Fe2O3 had granular shape with a diameter of about 50 to 100 nm below 490 °C, while at high temperatures above 490 °C cubic particles with relatively large size of about 500 nm to 2 μm were produced. We found that this dramatically change of particle morphology including their sizes and shapes was caused by the effects of the liquid phase in the reaction.抄録全体を表示PDF形式でダウンロード (1622K) -
田中 麻祐子, 寺居 臣治, 新見 義朗2011 年 58 巻 9 号 p. 535-541
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスCu-Ni-Sn system alloy had been found as high strength by causing the spinodal decomposition of the matrix. Properties of this alloy have been well investigated in the casting process, but not so well in the PM process. Therefore, the sintering and heat treating experiments using each of alloyed and mixed powders of Cu-9mass%Ni-8mass%Sn system carried out to reveal the better condition in the PM process. The results indicated that the sintered compacts using alloyed powder had all homogeneous structures, but those using mixed powder had heterogeneous structure. Furthermore, when sintered compacts using alloyed powder was aged at 623 K for 3.6 ks after sintering, it showed the highest strength with characteristic modulated structure caused by spinodal decomposition. In addition, it was necessary to cool the sintered compacts down to 573 K within 260 s after sintering to obtain supersaturated solid solution avoiding aging during the cooling process.抄録全体を表示PDF形式でダウンロード (2318K)
特集：磁性微粒子・薄膜の形成プロセス，集積化プロセスならびにそれらの応用に関する新展開
総報
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松下 伸広2011 年 58 巻 9 号 p. 544
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスPDF形式でダウンロード (125K)
総説
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—磁性フォトニック結晶とマグノニック結晶の形成と応用—井上 光輝, Alexander Baryshev, 高木 宏幸, Pang Boey Lim, 内田 裕久2011 年 58 巻 9 号 p. 545-552
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスMagnetophotonic crystals and magnonic crystals having periodic structures formed band gaps by interference of waves. A one-dimensional magnetophotonic crystal (1D-MPC), which exhibits optical Tamm state at the interface between magnetic and nonmagnetic photonic crystals (PCs), shows resonant transmissivity and large enhancement of Faraday rotation at the localized mode inside the photonic band gap. We developed two-dimensional magnetophotonic crystals (2D-MPCs) on various types of templates with periodical structures. A 2D-MPC with multi-layers formed on a periodic 1D line resist template has several photonic band gaps with enhanced magneto-optical (MO) effects. In a structural garnet film formed on the opal template, a significant enhancement of MO response was obtained at edges of band gaps. Magnonic crystal with Cu metal strips formed on YIG surface showed high sensitivity of 11400 %/Oe as a magnetic sensor. In addition, enhanced MO effect was demonstrated by plasmonic composite films with noble metal particles and magnetic garnet.抄録全体を表示PDF形式でダウンロード (1666K)
受賞記念講演
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黒川 晴己2011 年 58 巻 9 号 p. 553-559
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスMorphological control of goethite particles by various operation conditions in a bench scale was devised in an attempt to improve magnetic properties of the end products. Reaction parameters were systematically varied and the detailed crystallographical analyses based on X-ray diffractometry and electron micrographs were employed as principal analytical tools.
When ferrous sulfate and sodium hydroxide were used, precursors immediately before goethite were Fe(OH)2 or Green rust (II), at excess or deficiency of alkali, respectively. The superiority of goethite particles is mainly attributed to adequate lateral growth along (110) as compared to the growth rate in (010). Preferential lateral growth, in turn, was predominated by the concentration of FeOH+ complex ions. Green rust (II) was stabilized by the buffering function of Fe2+ in the solution. Coexistence of green rust (II) with goethite enables steady growth of goethite preferentially in the axial direction, resulting in an increase in the aspect ratio.
Since morphology of those magnetic materials is sustained from those of goethite, it is safe to conclude that proper choice of the starting ferrous source, extent of alkali excess and concentration of dissolved oxygen are the key factors for better goethite particles and, hence, better materials for magnetic recording.抄録全体を表示PDF形式でダウンロード (1067K)
研究
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竹内 有沙子, 勝又 健一, 岡田 清, 松下 伸広2011 年 58 巻 9 号 p. 560-565
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスA new-type ferrite plating process using recycled waste solution was proposed in this study to attain ferrite film fabrication at low environmental load. Although spin-spray technique enables us to deposit crystallized spinel ferrite films at very low temperature (<100°C) by spraying an aqueous reaction solution and oxidizing one onto substrates, this technique exhausts large quantity of waste solution, and it detracts the point of merit of ferrite plating as eco-friendly process. In this study, the waste solution, from which iron ions were removed as precipitated iron hydroxides, was used as recycled oxidizing solution in spin-spray technique. The additional amounts of oxidizer (H2O2) and pH modifier (NH3 aq) to waste solution significantly affected to the crystallinity and saturation magnetization of ferrite films fabricated by recycling process. The recycled oxidizing solution was prepared by adding relatively small amount 0.8 ml of H2O2 to waste solution of 3.0 L and adjusting the pH at relatively high 8.8-9.0. The ferrite films fabricated by using this recycled oxidizing solution had crystallite orientation and exhibited the saturation magnetization almost same as those of ferrite films fabricated by conventional spin-spray technique using fresh solutions.抄録全体を表示PDF形式でダウンロード (1274K)
本会記事
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2011 年 58 巻 9 号 p. Pref9_1
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスPDF形式でダウンロード (129K) -
2011 年 58 巻 9 号 p. Mtg9_2-Mtg9_6
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスPDF形式でダウンロード (263K) -
2011 年 58 巻 9 号 p. MtgPr9_8-MtgPr9_30
発行日: 2011年
公開日: 2011/12/13
ジャーナル オープンアクセスPDF形式でダウンロード (680K)
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