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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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    Preparation of Strontium Titanate / Barium Titanate Complex Nanoparticles using New Titanium Chelate Compounds

    Takayuki GotoPetr PulpanTakahiro TakeiYoshihiro Kuroiwa...
    P.175-178页
    查看更多>>摘要：The conditions for strontium titanate (SrTiO_3, ST) nucleation and particle growth were investigated for preparation of ST/ barium titanate (BaTiO_3, BT) complex nanoparticles. The conditions with and without ST nucleation were clarified. Epitaxial growth of ST layer on the BT substrate particles was studied using both conditions. Unfortunately, the ST/BT complex nanoparticles with heteroepitaxial interface were not prepared, but a new two-step solvothermal reaction method was developed. Finally, the ST/BT complex nanoparticles without heteroepitaxial interface were successfully prepared.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Thermal property of BaO-TiO_2-GeO_2 glass and the crystallization behavior

    Yoshiki YamazakiHirokazu MasaiYoshihiro TakahashiTakumi Fujiwara...
    P.179-182页
    查看更多>>摘要：Correlation between surface crystallization behavior of BaO-TiO_2-GeO_2 (BTG) glass and the thermal stability parameter measured by Differential Thermal Analysis (DTA) was examined. We have proposed normalized thermal stability △T_(norm) of the BTG glass using crystallization temperature (Tx), glass transition temperature (Tg), and melting temperature (Tm). It was found that surface crystallization occurred in the BTG glass possessing △T_(norm) (= (Tx-Tg)/Tm) value larger than 0.08. Compared △T_(norm) value of bulk state with that of powdered state, it has been revealed that Ba_2TiGe_2O_8 was precipitated independently of thermal stabilities whereas BaTiGe_3O_9 or BaGe_4O_9 was precipitated in precursor glasses possessing high surface stability.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Dispersion of Barium Titanate and Strontium Titanate Nanocubes and Their Selective Accumulations

    Satoshi WadaAi NozawaShogo IwatsukiTetsuo Kuwabara...
    P.183-186页
    查看更多>>摘要：Barium titanate (BaTiO_3, BT) and strontium titanate (SrTiO_3, ST) nanocube particles were prepared by a solvothermal method. The prepared particles were collected by a centrifugal separator. The X-ray diffraction (XRD) measurement and a transmittance electron microscope (TEM) observation confirmed the formation of perovskite BT and ST nanocube particles with sizes of around 17 nm. These nanocube particles were monodistributed in hexane with tri-n-butylphosphine oxide (TBPO) as dispersant, separately, and then, the accumulations composed of the BT and ST nanocubes were built up using a selective catalytic reaction between 3-bromopropylphosphonic acid (BP) and aminomethylphosphonic acid (AM) as smart glue. The TEM observation confirmed that a part of accumulations showed a hetrointerface connection between BT and ST.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis and Characterization of CaZnGe_2O_6

    Hirotoshi HatakeyamaYousuke NarumiKazuyoshi UematsuTadashi Ishigaki...
    P.187-190页
    查看更多>>摘要：We report the synthesis and photocatalytic activity of CaZnGe_2O_6, which contains Ca~(2+) ions and one-dimensional GeO_4 chains (Ge~(4+): d~(10) electronic configuration). This sample demonstrated the water splitting phenomenon by loading with RuO_2 cocatalysis. Moreover, Ln-doped CaZnGe_2O_6 (where Ln = La, Ce, Pr, Nd, or Sm) shows a higher photocatalytic activity than CaZnGe_2O_6.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis and characterization of low-dimensional structure photocatalyst BaGeGa_6O_(12)

    Miki NishiyaKazuyoshi UematsuTadashi IshigakiKenji Toda...
    P.191-194页
    查看更多>>摘要：Low-dimensional structure compounds as layered perovskite shows high photocatalytic activity in water splitting. In this study, we investigated that synthesis and characterization of photocatalytic activity of BaGeGa_6O_(12) with a one-dimensional structure. BaGeGa_6O_(12) with loading 0.3wt% RuO_2 showed a photocatalytic activity for water splitting into H_2 (70.6 μ mol / h) and O_2 (28.1 μ mol/h)..
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Composite Electromagnetic Wave Absorber Made of Both Sendust and Aluminum Particles Dispersed in Polystyrene Resin

    Kenji SakaiYang GuanYuuki SatoShinzo Yoshikado...
    P.197-200页
    查看更多>>摘要：To design an electromagnetic wave absorber with good absorption properties at frequencies above 1 GHz, the frequency dependences of the relative complex permeability μ_r~*, the relative complex permittivity ε_r~*, and return loss were investigated for the composite made of both sendust (an alloy of Al 5%, Si 10%, and Fe 85%) and aluminum particles dispersed in polystyrene resin. It was found that the frequency dependence of μ_r~* for this composite can be changed by adjusting the particle size of aluminum and the volume mixture ratio of sendust and aluminum. Therefore, a flexible design of an absorber with good absorption characteristics was proposed based on the ability to control μ_r~*. The composite made of both sendust and aluminum was found to exhibit a return loss of less than -20 dB in the frequency range of not only several GHz but also around 20 GHz if appropriate volume mixture ratio and particle size were selected.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effects of H_2O Addition on One-step Liquid-phase Synthesis of Highly Aligned Carbon Nanotubes

    Shunsuke YamashitaTomoka KikitsuYoshihiro YamaguchiKiyofumi Yamagiwa...
    P.201-204页
    查看更多>>摘要：Highly aligned carbon nanotube arrays (HACNTAs) were synthesized on a stainless steel substrate from a methanol solution of Co(III) acetylacetonate by the one-step liquid-phase synthesis, and effects of H_2O addition on the HACNTA growth were examined. The growth rate was considerably accelerated, and the lifetime of the catalysts was prolonged by addition of a small amount of H2O. HACNTAs with over 400 μm thickness were formed on the side surfaces of the substrate by resistance-heating for one hour. This suggests that the added H_2O removes deposited amorphous carbons from the catalyst surfaces and consequently accelerates the growth rate.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Relationship between aluminum and lithium and annealing for reducing lithium contamination in aluminum-implanted zinc oxide

    Isao SakaguchiKenji MatsumotoTakeshi OhgakiShunichi Hishita...
    P.205-208页
    查看更多>>摘要：The relationship between Al and Li during diffusion was studied using Al-implanted ZnO. The Al donor in ZnO acts to increase the concentration of Li contamination from the atmosphere during the annealing. It is difficult to decompose the relationship formed by diffusion between Al and Li during high-temperature annealing. The most effective method to decompose the relationship is to anneal the as-implanted ZnO at a pressure of 5×10~(-3) torr. This annealing increases the Al solubility limit because the ZnO surface evaporates.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effect of substrate on growth mechanism of flower structured InN fabricated by APHCVD

    Naonori SakamotoHaruka SugiuraDesheng FuNaoki Wakiya...
    P.209-212页
    查看更多>>摘要：InN belongs to the III-group nitride materials and is known to have a low decomposition temperature which causes intractable grain growth compared to the other nitrides, GaN, A1N, etc. We prepared InNs with a flower-like shape as well as film structure by Atmospheric Pressure Halide CVD process, in which InN is synthesized by CVD under atmospheric pressure. In the present study, growth mechanisms of the flower structured InN prepared on Si(100) and a-plane sapphire substrates is reported.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Characteristics of Hot Spot Oxygen Sensor Using GdBa_2Cu_3O_(7-δ) Ceramic Rod with Gd_2BaCuO_5 Core

    Shingo FujiharaYuichiro KurokiTomoichiro OkamotoMasasuke Takata...
    P.213-216页
    查看更多>>摘要：A ceramic rod of GdBa_2Cu_3O_(7-δ) with Gd_2BaCuO_5 core was prepared using a dip coater and sintered at 950℃. A hot spot appeared when a certain voltage was applied to the rod. Oxygen sensing characteristics of the rod were investigated. It was found that the response time of the oxygen sensor using the rod with the core was shorter than that without the core, because the length of the oxygen diffusion in GdBa_2Cu_3O_(7-δ) part in the rod with the core was shorter than that without the core.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd