The superconducting bismuth-based mixed oxides

E. V. Antipov, N. R. Khasanova, J. S. Pshirkov, S. N. Putilin, C. Bougerol, O. I. Lebedev, G. Van Tendeloo, A. N. Baranov, Y. W. Park

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The present paper describes the synthesis, characterization of mixed-valence bismuthates with three- or two-dimensional perovskite-like structures and structural criteria that influence superconductivity in these compounds. Single-phase samples of Sr1-xKxBiO3 were prepared for the broad range of K-content: 0.256≤x≤0.65. For these bismuthates the symmetry of the structure changes from monoclinic to orthorhombic and finally to tetragonal upon increasing the K-content thus resulting in the decrease of the Bi-O distances and reduction of the network distortions. Superconductivity with maximum Tc = 12 K exists in the narrow range (x ≈ 0.5-0.6) within the stability field of the tetragonal phase (0.33≤x≤0.65), when the threedimensional octahedral framework has close to the ideal perovskite structure arrangement. The layered type (Ba,K)3Bi2O7 and (Ba,K)2BiO4 bismuthates belonging to the An+1BnO3n+1 homologous series were investigated. Buckling of the (BiO2) layers in the structure of the n = 2 member occurs due to the ordering of alkaline- and alkaline-earth cations between two independent positions. The formation of the one-layer bismuthate was revealed by Electron Microscopy and XRPD studies. Both types of compounds are considered to be possible candidates for new superconducting materials among bismuthates.

Original languageEnglish
Pages (from-to)425-430
Number of pages6
JournalCurrent Applied Physics
Volume2
Issue number5
DOIs
Publication statusPublished - Oct 2002
Externally publishedYes

Keywords

  • Bi-based mixed oxides
  • Crystal structure
  • Electron microscopy
  • Superconductivity

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