• Formation and characterization of Y:247 film through spray pyrolysis technique

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      https://www.ias.ac.in/article/fulltext/boms/027/02/0113-0119

    • Keywords

       

      Thin film; quenching; superconducting.

    • Abstract

       

      The synthesis of high temperature superconducting films of Y:247 (𝑇c ∼ K) have been successfully achieved. The difficulty in synthesis owing to narrow range of stability of Y:247 has been taken care of through several quenching modes, e.g. quenching of the films synthesized at ∼ 850°C, in air or in liquid nitrogen. The energy dispersive analysis of X-rays (EDAX) and transmission electron microscopy (TEM) studies of the as processed film, Y2Ba4Cu7O14+𝑥, exhibit nearly correct cationic stoichiometry of 2 : 4 : 7; also narrow regions (< 50 Å) of minority Y:124 phase and stacking faults capable of working as flux pinning sites have been invariably found to be present. In addition to Y:247, Ag admixed films have also been investigated. The 𝑇c here is ∼ 70–75 K which is similar to that of the film without silver. Representative estimates of transport critical current density (𝐽c) for Y:247 films is ∼ 103 A/cm2, and with silver corresponding to Y2Ba4Cu7O14+𝑥 (Ag0.1) is found to be ∼ 104 A/cm2.

    • Author Affiliations

       

      Suman Anand1 2 O N Srivastava1

      1. Department of Physics, Banaras Hindu University, Varanasi 221 005, India
      2. Optical Radiation Standards, National Physical Laboratory, New Delhi 110 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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