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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Proton Conducting Electrolytes Synthesized with Diammonium Hydrogen Phosphate

    Dedy Eka PRIYANTOHidenobu SHIROISHISatoshi TANIMOTOShunsuke HIRUKAWA...
    471-474页
    查看更多>>摘要：Proton conducting ZrO_2-yP_2O_5(y = 1.0, 1.2, 1.4. 1.6, 1.8) electrolytes based on a shell-core structure were synthesized with diammonium hydrogen phosphate by a solid state reaction, and their conductivities were investigated by ac-impedance spectroscopy. Among the ZrO_2-yP_2O_5 compositions, ZrO_2-1.6P_2O_5 showed the highest proton conductivity of 0.13 Scm~(-1) at 250℃. The conductivity increased with increasing P_2O_5 molar ratio and were significantly influenced by heat-treatments in the preparation process. Polytetraflouroethylene (PTFE) was also mixed into these electrolytes in order to improve the mechanical strength and long term durability.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effect of organic compound on the preparation of C/LiFePO_4 powders by spray pyrolysis

    Koji EgawaTakayuki KoderaTakashi Ogihara
    475-478页
    查看更多>>摘要：Spherical C/LiFePO_4 cathode materials were successfully prepared by spray pyrolysis. The saccharides such as monosaecharide and disaccharide or organic acid were used as carbon source. SEM observation showed that they had spherical morphology with particle size of about 1 μm. XRD analysis revealed that the olivine phase was obtained by heating at 700 ℃ under the atmosphere of argon/hydrogen (5 %). Electrochemical measurement revealed that the rechargeable capacity of LiFePO_4 was significantly improved by the addition of carbon. The use of sucrose was most effective for the high rechargeable capacity and cycle stability.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Oxygen Reduction Reaction Activity of Pyrochlore Oxide Electrocatalysts Prepared by Precipitation Method

    Hideki KAWAIKenji YOSHIHARATakayuki KONISHIMorihiro SAITO...
    479-482页
    查看更多>>摘要：The Mn-doped pyrochlores Pb_2Ru_(1.5)Mn_(0.5)O_(7-δ) (PRMns) samples were synthesized by a precipitation method, followed by heat-treatments at temperatures of 300-800℃. Effects of the heat-treatments on their electrocatalytic activities for oxygen reduction reaction (ORR) were examined by semi-steady state voltammetry with a rotating ring-disk electrode in 0.1 M KOH solution at 70℃. The PRMns showed the best ORR activity for the 500℃-heat-treated PRMn. The onset potential of the ORR current was over 1.0 V vs RHE, and the efficiency of 4-electron reduction was almost 100%. The maximum in the ORR activity for the 500℃-heat-treated PRMn resulted from a trade-off effect between their crystallinity and specific surface areas.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Screen Printing Parameter Effect on the Surface Roughness Measurement of Printed Gold Paste on LTCC Tape

    Sabrina Mohd ShapeeRosidah AliasAzmi IbrahimZulkifli Ambak...
    485-489页
    查看更多>>摘要：Effect of screen printing parameter such as squeegee speed was studied in this paper for the surface roughness of gold paste on the Ferro A6M LTCC tape. Roughness measurement was evaluated by 3D profilometer of the Ferro A6M LTCC tape co-fired with Au conductor paste.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis and Characterization of Samarium doped Ceria (Ce_(0.8)Sm_(0.2)O_(1.9)) Nano-Particle by Aerosol Plasma Pyrolysis

    Kenichi MYOUJINYoshiki ICHIKAWAAraki TORIYAMATakayuki KODERA...
    490-493页
    查看更多>>摘要：Spherical Ce_(0.8)Sm_(0.2)O_(1.9) precursor powders were synthesized by Aerosol Plasma pyrolysis using aqueous solution of metal nitrate. As-prepared powders obtained by this method have a spherical morphology with a nano size and submicron size. They had bimodal size distribution. The average size of primary particles was less than 100 nm. The concentrations of starting solution influenced to average particle size. The relative density of SDC pellet was highest when it was sintered at 1623 K. The relative density was 86 %. XRD, SEM, DTA-TG and BET analysis were used for determination of the composition, morphology, particle size and surface area.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis of Nano-sized Oxide Phosphor Particles Using an Ion-exchange Polymer/Water/Oil Emulsion Method

    Hiroyuki SanoSeiichirou HaradaMikio ShimizuMakoto Kuwabara...
    494-497页
    查看更多>>摘要：We synthesized nano-sized Eu-doped Y_2O_3 (Y_2O_3:Eu) phosphor powder by an ion-exchange polymer/water/oil (W/O) emulsion method using carboxymethyl cellulose (CMC) as the ion-exchange polymer, in which the CMC-(Y, Eu) gel formed was calcined at 800℃ in air to convert into Y_2O_3:Eu particles. The obtained phosphor powder consists of unagglomerated particles with sizes in the range of 30-80 nm and exhibits strong red emission at 612 nm. This CMC/W/O method for producing nano-sized oxide powder has significant advantages over conventional solid-phase and chemical solution-based methods because this method can provide unagglomerated nanoparticles of oxide phosphor without employing any mechanical pulverizing process for reducing the particles' size into the nanometer range; mechanical grinding, such as ball milling, of phosphor powders has been well known to cause a significant degradation of their luminescent properties.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Low Temperature Synthesis of TiO_2 from Acid Solution

    Soichiro WatanabeSae NakajimaKazuyoshi UematsuTadashi Ishigaki...
    498-501页
    查看更多>>摘要：Fine TiO_2 particles were synthesized from titanate precursor, Na_(16)Ti_(10)O_(28), dissolved in aqueous HNO_3 solution. Crystalline rutile TiO_2 powders were prepared by reflux of dissolved powders in the aqueous HNO_3 solution under 100 ℃. Prepared TiO_2 powders were characterized by X-ray diffraction, thermogravimetry, scanning electron microscopy and BET specific surface area analysis.
      原文链接:
    • NETL
    • NSTL

    Fabrication of PbTiO_3 Nanocrystals on Atomically Flat Sapphire Substrates by Sputtering

    Takashi NishidaKoichi KuboMasahiro EchizenHiroaki Takeda...
    502-505页
    查看更多>>摘要：In order to perform the growth position control, PbTiO_3 (x=0) (PTO) nanocrystals were deposited on atomically flat and non-atomically flat α-Al_2O_3 substrates by RF magnetron sputtering. The atomically flat substrates with atomic steps and terrace are expected to induce the lateral growth along a terrace between the surface steps. In the case of the atomically flat, the nanocrystals got lined up along the atomic steps, and uniform nanocrystals were obtained on surface in same pitch.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Particle Structure Analysis of Highly-dispersed Barium Titanate Nanoparticles Obtained from Barium Titanyl Oxalate Nanoparticles and Their Dielectric Properties

    Shuhei KondoChikako MoriyoshiYoshihiro KuroiwaSatoshi Wada...
    506-509页
    查看更多>>摘要：Barium titanate (BaTiO_3) nanoparticles were prepared by two-step thermal decomposition method of barium titanyl oxalate nanoparticles with a size of 30 nm. The BaTiO_3 particle sizes were changed from 12.3 to 142 nm by control of temperature at 2nd step. The X-ray diffraction (XRD) measurement revealed that a clear splitting of 002 and 200 planes was observed over 40 nm, and the cla ratio of 1.0089 was obtained for the BaTiO_3 nanoparticles with a size of 62.3 nm. This high cla ratio in the BaTiO_3 nanoparticles suggested that its mesoscopic particle structure was composed of very thin surface cubic layer below 5 nm. Thus, synchrotron XRD data were analyzed using a "two layers" model and a "three layers" model. The Rietveld analysis using the three layers model resulted in the particle structure with a cubic layer thickness of 2.5 nm and structure gradient layer thickness of 7.5 nm. Finally, the dielectric constant of these BaTiO_3 nanoparticles with thin surface cubic layer was measured at room temperature, and the maximum dielectric constant over 30,000 was obtained at the nanoparticles with a size of 83.6 nm.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Preparation of barium titanate nanoparticle thin films by the electrophoretic deposition method using polyacrylic acid as a charge-compensating agent

    Masashi ArimuraTeruhisa MakinoKunitaka FujiyoshiMakoto Kuwabara...
    510-513页
    查看更多>>摘要：Using the electrophoretic deposition (EPD) method, we prepared barium titanate nanoparticle (BT-NP) thin films by depositing BT-NP monodispersed in ethylene glycol monomethyl ether (EGMME) onto an electrically conductive substrate coated with polyacrylic acid (PAA). Deposition efficiency was increased compared to conventional EPD, and the uniformity of the film thickness was also improved as a result of the BT-NPs cohesion effect of the PAA coating on the substrate in addition to the electrophoretic deposition effect of the electric field. When low-molecular-weight PAA was used, the film was reinforced since PAA, which coats the substrate, diffused close to the surface of the BT-NP film during film formation. A crack-free BT-NP film was produced with a film thickness of several micrometers.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd