• Suman Anand

      Articles written in Bulletin of Materials Science

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

      Suman Anand O N Srivastava

      More Details Abstract Fulltext PDF

      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.

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