α-feas-free SmFeAsO1-xFx by low temperature sintering with slow cooling

Masaya Fujioka, Saleem J. Denholme, Toshinori Ozaki, Hiroyuki Okazaki, Keita Deguchi, Satoshi Demura, Hiroshi Hara, Tohru Watanabe, Hiroyuki Takeya, Takahide Yamaguchi, Hiroaki Kumakura, Yoshihiko Takano

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    We obtained amorphous-FeAs-free SmFeAsO1-xFx using a low temperature sintering with slow cooling. SmFeAsO1-xFx is sintered at 980 °C for 40h and cooled slowly down to 600 °C. The low temperature sintering suppresses the formation of amorphous FeAs, and the slow cooling introduces much fluorine into SmFeAsO1-xFx. The superconductivity of this sample appears at 57.8 K and the superconducting volume fraction reaches 96%. To study the change of fluorine concentration during the cooling process, samples are quenched by water at 950, 900, 850, 800, 750, and 700 °C. It is found that fluorine is substituted not only at the maximum heating temperature but also during the cooling process. The low temperature sintering with slow cooling is very effective to obtain a homogeneous SmFeAsO1-xFx with high fluorine concentration.

    Original languageEnglish
    Article number094707
    Journaljournal of the physical society of japan
    Volume82
    Issue number9
    DOIs
    Publication statusPublished - 2013 Sep 1

    Keywords

    • Bulk
    • Iron-based superconductor
    • Low temperature sintering
    • Slow cooling
    • SmFeAsOF
    • Superconductivity

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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