New Iron Arsenide Oxides (Fe2As2)(Sr4(Sc,Ti)3O8), (Fe2As2)(Ba4Sc3O7.5), and (Fe2As2)(Ba3Sc2O5)

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Published 4 June 2010 • ©2010 The Japan Society of Applied Physics
, , Citation Naoto Kawaguchi et al 2010 Appl. Phys. Express 3 063102 DOI 10.1143/APEX.3.063102

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1 Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan

2 Japan Science and Technology Agency-Transformative Research-project on Iron Pnictides (JST-TRIP), Sanbancho, Chiyoda, Tokyo 102-0075, Japan

Dates

  1. Received 2 March 2010
  2. Accepted 8 May 2010
  3. Published

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Abstract

We synthesized new layered iron arsenide oxides (Fe2As2)(Sr4(Sc,Ti)3O8), (Fe2As2)(Ba4Sc3O7.5), and (Fe2As2)(Ba3Sc2O5). The crystal structures of these compounds are tetragonal with a space group of I4/mmm. The structure of (Fe2As2)(Sr4(Sc,Ti)3O8) and (Fe2As2)(Ba4Sc3O7.5) consists of the alternate stacking of antifluorite Fe2As2 layers and triple perovskite-type oxide layers. The interlayer distance between the Fe planes of (Fe2As2)(Ba4Sc3O7.5) is ∼18.7 Å. Moreover, the a-axis of (Fe2As2)(Ba3Sc2O5) is the longest among the layered iron pnictides, indicating the structural flexibility of the layered iron pnictide containing perovskite-type layers. The bulk sample of (Fe2As2)(Sr4(Sc0.6Ti0.4)3O8) exhibited diamagnetism up to 28 K in susceptibility measurements.

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10.1143/APEX.3.063102