Fabrication of YBa₂Cu₃O_7-x Thick Films on Ag Substrate by Gas Deposition Using Ultrafine Powders

Abstract

Superconducting thick films 1mm wide and 1-100μm thick were prepared on Ag substrates by gas deposition using a YBa₂Cu₃O_7-x (123) ultrafine powder. After heat treatment at 850°C for 10h in O₂ atmosphere, a 123 thick film (1μm) with random grain orientation had a J_c of 2300A/cm² at 77K. The effects of Ag substrate and the depression of melting point of 123 ultrafine powder were discussed from a thermodynamic point of view.