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      https://www.ias.ac.in/article/fulltext/boms/014/03/0585-0592

    • Keywords

       

      High periodic structures; cation deficiency; modified synthesis; planar faults

    • Abstract

       

      The second generation of high temperature superconductors typified by Bi2Sr2Can−1CunO2n+4 and Tl2Ba2Can−1CunO2n+4 exhibits curious structural properties which have direct relevance to the superconducting behaviour particularly transition temperature (Tc). The present paper reports on investigations of structural properties at microlevel in Bi-bearing HTCS. We have found curious structural characteristics which manifests itself in the form of transformation fromap×ap×c to (2)1/2ap×(2)1/2ap×c through the loss of calcium atoms and the formation of five-fold modulated phase alongb through the loss of Ca and Sr atoms. We have also found the evidence of high periodicities (n=4) Bi2Sr2Ca3Cu4O12. The microstructural characteristics of HTCS showing the higherTc(R=0) ∼ 120 K exhibits unusual characteristics.

    • Author Affiliations

       

      B Das1 K Ramakrishna1 G D Verma1 R S Tiwari1 O N Srivastava1

      1. Department of Physics, Banaras Hindu University, Varanasi - 221 005, India
    • Dates

       
  • Bulletin of Materials Science | News

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