Mechanically activated self-propagating high-temperature synthesis of La0.9Sr0.1Ga0.8Mg0.2O3-δ as an electrolyte for SOFC

Hiroyuki Ishikawa, Makiko Enoki, Tatsumi Ishihara, Tomohiro Akiyama

    研究成果: ジャーナルへの寄稿学術誌査読

    7 被引用数 (Scopus)

    抄録

    In this paper, we report on synthesis of highly pure La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM9182) powder with high crystallinity by mechanically activated (MA) self-propagating high-temperature synthesis (SHS), in which the synergy effects of MA and SHS on final and intermediate products were mainly examined. In the experiments, raw materials of La2O3, SrCO3, Ga2O3, Mg and NaClO4 were fractured and well mixed by planetary ball milling for different periods from 0 h to 24 h, then the bottom surface of the green compacts were electrically ignited for producing pure LSGM9182 through the propagation of sustainable exothermic reaction. The final and intermediate products, shortly after MA treatment, were characterized by XRD, SEM, XRF and particle size analyzer. During the planetary ball milling, the raw materials became gradually amorphous due to disordering of crystal structure. Interestingly, the longer milling operation caused the larger particle size of the raw material because nanoparticles, generated by the milling, became easily massed together. More significantly, the MA pretreatment improved a reactivity of the SHS to purify the product. In particular, the combination of MA-SHS with ball milling of 24 h at 300 rpm gave the highest-grade LSGM9182 product of nano-sized primary particles. The results appealed that the SHS after the MA treatment was quite effective for initiating, activating, sustaining and completing the solid-solid reaction synthesis of functional perovskite-type oxide with mild exothermic heat.

    本文言語英語
    ページ(範囲)238-242
    ページ数5
    ジャーナルJournal of Alloys and Compounds
    488
    1
    DOI
    出版ステータス出版済み - 11月 20 2009

    !!!All Science Journal Classification (ASJC) codes

    • 材料力学
    • 機械工学
    • 金属および合金
    • 材料化学

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