IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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Volume 126, Issue 1
Displaying 1-18 of 18 articles from this issue
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Special Issue on Technology 2006 : Reviews & Forecasts
Special Issue Review
Special Issue Paper
  • Recent Studies on Schumann Resonance
    Yoshiaki Ando, Masashi Hayakawa
    2006 Volume 126 Issue 1 Pages 28-30
    Published: 2006
    Released on J-STAGE: April 01, 2006
    DOIhttps://doi.org/10.1541/ieejfms.126.28
    JOURNAL FREE ACCESS
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    Recent studies on Schumann resonance, natural electromagnetic resonance in the Earth-ionosphere shell-cavity, are summarized briefly.
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  • Mechanical and Dielectric Breakdown Properties of Biodegradable Plastics
    Katsuyoshi Shinyama, Shigetaka Fujita
    2006 Volume 126 Issue 1 Pages 31-36
    Published: 2006
    Released on J-STAGE: April 01, 2006
    DOIhttps://doi.org/10.1541/ieejfms.126.31
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    The mechanical and dielectric breakdown properties of polylactic acid (PLA), which is a biodegradable plastic, were examined, and a physicochemical analysis was performed. At room temperature, the tensile strength of PLA was about 100 MPa, almost the same as for PP, but at 100°C, even the value for LDPE decreased. The Young's modulus of PLA at room temperature was about 3.6 GPa, about 1.7 times the value for PP, and about 11 times the value for LDPE. The Young's modulus of PLA decreased slowly with a rise in temperature, and at high temperatures, 60°C and above, it decreased rapidly. The dielectric breakdown strength (EB) of PLA at room temperature was about 6.2 MV/cm, about 1.4 times the value for LDPE. The EB of PLA increased with an increase in temperature, and was about 6.9 MV/cm at 60°C (∂EB/∂T≥0). In this region, it is thought that a secondary effect due to space charge occurred, as well as an electron avalanche breakdown. However, the EB of PLA decreased at temperatures higher than 60°C in the high temperature region (∂EB/∂T<0). In this domain, it is thought that thermal breakdown occurred, and that electromechanical breakdown also occurred in the high temperature domain of 80°C and above.
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  • Rare Gas Metastable Atom Density in Diluted O2 RF Plasmas
    Takeshi Kitajima, Kei Takahashi, Toshiki Nakano, Toshiaki Makabe
    2006 Volume 126 Issue 1 Pages 37-42
    Published: 2006
    Released on J-STAGE: April 01, 2006
    DOIhttps://doi.org/10.1541/ieejfms.126.37
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    Rare gas diluted O2 plasmas are gaining interests for application to high quality SiO2 film formation. The density of rare gas metastable atoms and O atom in rare gas diluted O2 radio frequency (RF) capacitively coupled plasma (CCP) was measured by optical absorption spectroscopy (OAS). Decreases of rare gas metastable densities due to addition of O2 indicate efficient O atom production by rare gas metastables via collisional quenching. Krypton metastable had highest density among four rare gas species for fixed RF power. The decrease of Ar metastable density due to O2 addition showed quantitative agreement with reported quenching rate coefficient. Detailed discussion on different gas pressures illustrates reduced O2 fraction is the key for selective production of O atoms through rare gas metastables.
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Special Issue Letter
Paper
  • Formation and Expansion of Ablation Plasmas Produced by Pulsed Ion Beams for Thin Films Production
    Masaru Yazawa, Chainarong Buttapeng, Nobuhiro Harada, Hisayuki Suemats ...
    2006 Volume 126 Issue 1 Pages 45-50
    Published: 2006
    Released on J-STAGE: April 01, 2006
    DOIhttps://doi.org/10.1541/ieejfms.126.45
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    The formation and expansion of the ablation plasmas by ion-beam evaporation (IBE), which was a method of the thin films production using the ablation plasmas deposited on the substrates, were analyzed numerically. We used the one-dimensional hydrodynamic model explained the interaction between the targets and incident ion beams. Changing ion beam angle could control the ablation pressure during the formation of the ablation plasma without significantly changes of the plasma temperature. The expansion velocities of the ablation plasma reached up to the substrates for various target materials were defined by distributions of the ion number densities of the ablation plasmas, and were agreed well with experimental ones observed by high-speed camera. We found out that there was a time lag of the ablation plasma reached up to the substrate between the peak of the plasma ion number density and plasma temperature. The numerical results of the expansion velocities of the ablation plasmas and plasma temperatures could apply to estimate for the production of not only the thin films but also the multi-layered ones.
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  • Nanosized Ferrite Particles Synthesized by Pulsed Wire Discharge
    Pengyuan Lee, Hisayuki Suematsu, Weihua Jiang, Kiyoshi Yatsui
    2006 Volume 126 Issue 1 Pages 51-54
    Published: 2006
    Released on J-STAGE: April 01, 2006
    DOIhttps://doi.org/10.1541/ieejfms.126.51
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    Nanocrystallites ferrite particles (ZnFe2O4, CoFe2O4) have been synthesized successfully by high power short electric pulse discharge of Fe and metal wires in oxygen. The powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Mean size of the obtained particles strongly depended on the oxygen pressure, which were determined by both BET and TEM. TEM observation shows that the well dispersed, uniform sized ferrite nanocrystallites was synthesized.
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  • Effect of Ambient Gas Temperature on Synthesis of Fe-N Nanosized Powders by Pulsed Wire Discharge
    Koji Suwa, Tsuneo Suzuki, Hisayuki Suematsu, Weihua Jiang, Kiyoshi Yat ...
    2006 Volume 126 Issue 1 Pages 55-59
    Published: 2006
    Released on J-STAGE: April 01, 2006
    DOIhttps://doi.org/10.1541/ieejfms.126.55
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    Fe-N nanosized powders successfully were synthesized in ambient ammonia (NH3) gas at different temperature by pulsed wire discharge (PWD). The powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results of XRD revealed that the powders synthesized from room temperature (R.T.) to 450 °C was α-Fe, γ-Fe(N), γ'-Fe4N and ε-Fe3N. The volume fraction of γ-Fe(N) decreased rapidly above 300 °C. On the contrary, those of α-Fe and γ'-Fe4N were increased. The volume fraction of ε-Fe3N was independent on ambient gas temperature. The median size of the synthesized powder observed by TEM increased with increasing ambient gas temperature.
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