A new iron pnictide oxide (Fe2As2)(Ca5(Mg, Ti)4Oy) and a new phase in the Fe-As-Ca-Mg-Ti-O system

Hiraku Ogino, Yasuaki Shimizu, Naoto Kawaguchi, Kohji Kishio, Jun Ichi Shimoyama, Tetsuya Tohei, Yuichi Ikuhara

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    13 Citations (Scopus)

    Abstract

    A new layered iron arsenide oxide (Fe2As2)(Ca 5(Mg, Ti)4Oy) and its structural derivative were found in the Fe-As-Ca-Mg-Ti-O system. The crystal structure of (Fe 2As2)(Ca5(Mg, Ti)4Oy) is identical to that of (Fe2As2)(Ca5(Sc, Ti) 4Oy), which was reported in our previous study. The lattice constants of this compound are a = 3.86(4) and c = 41.05(2). In addition, another phase with a thicker blocking layer was found. The structure of the compound was tentatively assigned through scanning transmission electron microscope observation as (Fe2As2)(Ca8(Mg, Ti)6Oy) with sextuple perovskite-type sheets divided by a rock salt layer. The interlayer Fe-Fe distance of this compound is ∼ 30. These compounds exhibited bulk superconductivity, as found from magnetization and resistivity measurements.

    Original languageEnglish
    Article number085020
    JournalSuperconductor Science and Technology
    Volume24
    Issue number8
    DOIs
    Publication statusPublished - 2011 Aug

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Condensed Matter Physics
    • Metals and Alloys
    • Electrical and Electronic Engineering
    • Materials Chemistry

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