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

[摘要] The synthesis of high temperature superconducting films of Y:247 (ð‘�??_c ∼ 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, Y₂Ba₄Cu₇O_{14+ð‘�?}, exhibit nearly correct cationic stoichiometry of 2 : 4 : 7; also narrow regions (< 50 Ã�?) 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 ð‘�??_c here is ∼ 70â€�??75 K which is similar to that of the film without silver. Representative estimates of transport critical current density (𝐽_c) for Y:247 films is ∼ 10³ A/cm², and with silver corresponding to Y₂Ba₄Cu₇O_{14+ð‘�?} (Ag_0.1) is found to be ∼ 10⁴ A/cm².

[学科分类] 材料工程

[关键词] Thin film;quenching;superconducting.