PREPARATION OF BI-BASED HIGH-Tc SUPERCONDUCTING FILMS FROM METHACRYLATE SOLUTIONS

摘要

Bi_2Sr_2CaCu_2Ox superconducting films containing minor amounts of Bi_2Sr_2Ca_2Cu_3Ox were prepared by spray pyrolysis of methacrylate solutions on LaAlO_3 substrates. The best superconducting properties (Tc ≈ 80 K, triangle open Tc≈10 K)were shown by the films annealed at 850℃,which consisted mainly of platelike crystallites with a high degree of [001] orientation. The composition, content, and morphology of the calcium strontium cuprates and oxides present as impurity phases were found to correlate with the annealing temperature and film thickness.