Crystal structure of the pyrochlore oxide superconductor KOs 2O6

Jun Ichi Yamaura, Shigeki Yonezawa, Yuji Muraoka, Zenji Hiroi

研究成果査読

100 被引用数 (Scopus)

抄録

We report the single-crystal X-ray analysis of the structure of the pyrochlore oxide superconductor KOs2O6. The structure was identified as the β-pyrochlore structure with space group Fd3̄m and lattice constant a=10.089(2)Å at 300K: the K atom is located at the 8b site, not at the 16d site as in conventional pyrochlore oxides. We found an anomalously large atomic displacement parameter Uiso=0.0735(8)Å2 at 300K for the K cation, which suggests that the K cation weakly bound to an oversized Os12O18 cage exhibits intensive rattling, as recently observed for clathrate compounds. The rattling of A cations is a common feature in the series of β-pyrochlore oxide superconductors AOs2O 6 (A=Cs, Rb and K), and is greatest for the smallest K cation.

本文言語English
ページ(範囲)336-340
ページ数5
ジャーナルJournal of Solid State Chemistry
179
1
DOI
出版ステータスPublished - 1月 2006
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 凝縮系物理学
  • 物理化学および理論化学
  • 無機化学
  • 材料化学

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