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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14 Citations (Scopus)


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
Issue number8
Publication statusPublished - 2011 Aug
Externally publishedYes

ASJC Scopus subject areas

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


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