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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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    Low temperature synthesis method of La_2O_2S_2 and evaluation of the photocatalytic activity

    Mamoru OhashiTadashi IshigakiKazuyoshi UematsuKenji Toda...
    P.217-220页
    查看更多>>摘要：Photocatalysts for overall water splitting have great potential in solar energy applications. A variety of photocatalysts have shown activity for water splitting. In particular, oxysulfides are the great interest because of their ability to generate H_2 and O_2 from water under visible light. However, they are generally synthesized under H_2S flow, which is an extremely harmful gas for humans. In this study, La_2O_2S_2 was synthesized at low temperature without H_2S gas, and its photocatalytic activity was confirmed by hydrogen generation experiments.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Photoluminescence in Bazirite Crystal by Addition of Impurity Ions

    Kenichiro IwasakiYoshihiro TakahashiHirokazu MasaiTakumi Fujiwara...
    P.221-224页
    查看更多>>摘要：We examined photoluminescent (PL) and afterglow properties in bazirite (BaZrSi_3O_9) phases with Sr~(2+)-, Sn~(4+)-, Ge~(4+)-, and Ti~(4+)-impurities, in order to elucidate effect of the impurity-addition on these properties. The bazirite phases studied showed blue PL and afterglow regardless of sort of the impurities. Origin of PL and afterglow emission in the bazirite phase is also discussed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Low-Frequency Inelastic Light Scattering of Glassy Ba_2TiGe_2O_8 During Heating Process

    Yoshihiro TakahashiHirokazu MasaiTakumi FujiwaraMinoru Osada...
    P.225-228页
    查看更多>>摘要：In-situ observation of inelastic light scattering of boson region in glassy Ba_2TiGe_2O_8 (BTG) was performed during heating process. The in-situ boson observation revealed structural relaxation below glass-transition temperature in the as-quenched sample, suggesting the nanometric structural heterogeneity. Relation of the boson behavior to crystallization tendency is also discussed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effects of LiF Addition in Lithium Ion Conductor La_(0.56)Li_(0.33)TiO_3

    Itta KomiyaKeisuke NakaoKiyofumi YamagiwaJun Kuwano...
    P.229-232页
    查看更多>>摘要：The compositions La_(0.56)Li_(0.33)TiO_(2.95)F_(0.05)·xLiF (x=0-025) were prepared by addition of LiF to the disordered form of the well-known Li ion conductor La_(0.56)Li_(0.33)TiO_3. Although the total conductivities improved, there was no change in the bulk conductivity with LiF addition. No reflections due to LiF were observed in their XRD patterns, and the profiles and the chemical shifts of their ~(19)F MAS-NMR resonances were almost the same as those of LiF. The results indicate that no substitution of F takes place, and that the added LiF acts simply as a sintering assistant agent.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Morphology control of phosphors synthesized by microwave heating method

    Ayano TodaKazuyoshi UematuTadashi IshigakiKenji Toda...
    P.233-236页
    查看更多>>摘要：Ba_2Gd_3Li_3Mo_8O_(32):Eu~(3+) phosphor was prepared using a single mode microwave oven operated at a frequency of 2.45 GHz and a power of 500 W. The temperature of raw materials, mixtures of BaCO_3, Gd_2O_3, Li_2CO_3, MoO_3 and Eu_2O_3 subjected to microwave irradiation increased to about 1073 K in 120 s, followed by a sharp drop despite irradiating the raw materials continuously. By measuring the dielectric loss factor of the raw materials at 2.45 GHz, the temperature increased could be attributed to the fact that MoO_3 absorbs a high proportion of microwave energy. In the case of the microwave heating method, the phosphor particles were highly non-aggregated.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effects of Zr and Y Addition on the Electrical Degradation Characteristics of ZnO Varistors

    Yuji AkiyamaAi FukumoriMasayuki TakadaYuuki Sato...
    P.237-240页
    查看更多>>摘要：The effects of the addition of Y or both Y and Zr to Bi-Mn-Co-Sb-Si-Cr-Ni-added ZnO varistors on the varistor voltage and the tolerance characteristics of electrical degradation were investigated. The deterioration of the tolerance characteristics of electrical degradation by the addition of Y was probably caused by an increase in the number of willemite (Zn_2SiO_4)-type particles or a decrease in the number of spinel (Zn_(2.33)Sb_(0.67)O_4)-type particles, but this deterioration was reduced by adding Zr. Moreover, the reduction in the average ZnO grain size due to the addition of Y was a major factor in the increased varistor voltage, and the ZnO grain growth was inhibited by the formation of an unknown compound after adding Y. The varistor voltage of a varistor with 2 mol% added Y increased by approximately 50% compared to a varistor with no Y added.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effect of Ba Addition on Electrical Characteristics of Bi-based ZnO Varistors

    Ai FukumoriMasayuki TakadaYuji AkiyamaYuuki Sato...
    P.241-244页
    查看更多>>摘要：With the goal of fabricating low-breakdown-voltage varistors, the effect of adding Ba to ZnO varistors on the ZnO grain size was investigated. Grain growth of ZnO could be markedly promoted by adding both Ba and Bi. The maximum grain size was approximately 150 urn and the minimum varistor voltage was approximately 12 V/mm. However, it had relatively poor tolerance characteristics for electrical degradation. It is speculated that when adding both Ba and Bi to a Mn-Co-added ZnO varistor, it is necessary to form the molten phases of Ba and Bi to promote grain growth of ZnO. It is also conjectured that the growth of ZnO grains is not promoted when Ba and Bi do not coexist in the molten phase because Ba forms compounds with Mn independently with the addition of small amounts of Bi.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd