A New Iron Pnictide Oxide (Fe2As2)(Ca5(Mg,Ti)4Oy) and a New Phase in Fe-As-Ca-Mg-Ti-O system

A new layered iron arsenide oxide (Fe2As2)(Ca5(Mg,Ti)4Oy) and its structural derivative were found in the Fe-As-Ca-Mg-Ti-O system. The crystal structure of (Fe2As2)(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...

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Bibliographic Details
Published in:arXiv.org 2012-06
Main Authors: Ogino, Hiraku, Shimizu, Yasuaki, Kawaguchi, Naoto, Kishio, Kohji, Shimoyama, Jun-ichi, Tohei, Tetsuya, Ikuhara, Yuichi
Format: Article
Language:English
Subjects:
Arsenic
Arsenides
Calcium
Crystal structure
Group 5A compounds
Halites
Interlayers
Iron
Lattice parameters
Magnesium
Perovskites
Superconductivity
Titanium
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Summary:A new layered iron arsenide oxide (Fe2As2)(Ca5(Mg,Ti)4Oy) and its structural derivative were found in the Fe-As-Ca-Mg-Ti-O system. The crystal structure of (Fe2As2)(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) A and c = 41.05(2) A. In addition, another phase with a thicker blocking layer was found. The structure of the compound and its derivative was tentatively assigned through STEM 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 A. The compound and its derivative exhibited bulk superconductivity, as found from magnetization and resistivity measurements.
ISSN:2331-8422
DOI:10.48550/arxiv.1006.3769