Crystal structure of Ca5(Sc0.4Ti0.6)4Fe2As2O11

Rayko Simura, Yudai Yatsu, Naomichi Sakai, Hisanori Yamane, Hiraku Ogino

研究成果: Article査読


Single crystals of Ca5(Sc0.4Ti0.6)4Fe2As2O11 exhibiting highly anisotropic properties compared to other iron-based superconducting materials were prepared by the self-flux method. Fundamental X-ray diffraction spots from a single crystal were indexed with tetragonal cell parameters of a = 3.8964(1) ¡, c = 41.2890(12) ¡, and weak diffuse streaks were observed along the c* direction at a period of a*/2. The fundamental diffraction data were analyzed using an average crystal structure model (space group I4/mmm). [FeAs] layers and perovskite-type block layers alternate in the crystal structure. Each block layer is composed of four sublayers: a central structure consisting of two individual perovskite-type [Ca8(Sc/Ti)O6] sublayers, and two outer oxygen-deficient [Ca8(Sc/Ti)O5] sublayers. In the [Ca8(Sc/Ti)O6] sublayers, the oxygen positions are split into four with equal probability. The chemical composition was determined to be Ca5(Sc0.4Ti0.6)4(FeAs)2O11, and the Ti content of greater than 0.5 suggests that the superconductivity can be attributed to electron doping.

ジャーナルJournal of the Ceramic Society of Japan
出版ステータスPublished - 2024

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 化学一般
  • 凝縮系物理学
  • 材料化学


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