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

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4 Citations (Scopus)


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
Issue number5
Publication statusPublished - Oct 2002
Externally publishedYes


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


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