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

doi:10.1088/0953-2048/24/8/085020

A new iron pnictide oxide (Fe₂As₂)(Ca₅(Mg, Ti)₄O_y) 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

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

A new layered iron arsenide oxide (Fe₂As₂)(Ca ₅(Mg, Ti)₄O_y) and its structural derivative were found in the Fe-As-Ca-Mg-Ti-O system. The crystal structure of (Fe ₂As₂)(Ca₅(Mg, Ti)₄O_y) is identical to that of (Fe₂As₂)(Ca₅(Sc, Ti) ₄O_y), 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)₆O_y) 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 language	English
Article number	085020
Journal	Superconductor Science and Technology
Volume	24
Issue number	8
DOIs	https://doi.org/10.1088/0953-2048/24/8/085020
Publication status	Published - 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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@article{37df956920774feb9aeed8353590f4b4,

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

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.",

author = "Hiraku Ogino and Yasuaki Shimizu and Naoto Kawaguchi and Kohji Kishio and Shimoyama, {Jun Ichi} and Tetsuya Tohei and Yuichi Ikuhara",

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language = "English",

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T1 - A new iron pnictide oxide (Fe2As2)(Ca5(Mg, Ti)4Oy) and a new phase in the Fe-As-Ca-Mg-Ti-O system

AU - Ogino, Hiraku

AU - Shimizu, Yasuaki

AU - Kawaguchi, Naoto

AU - Kishio, Kohji

AU - Shimoyama, Jun Ichi

AU - Tohei, Tetsuya

AU - Ikuhara, Yuichi

PY - 2011/8

Y1 - 2011/8

N2 - 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.

AB - 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.

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