MOCVD of Heavily-Doped 25 mol.% Zr-Added (Gd, Y) Ba2Cu3O7-δ Coated Conductors

The requirements for achieving critical current densities above 3.5 MA cm(-2) at 77 K, 0 T in heavily-doped Zr-added REBa2Cu3O7-delta (REBCO and RE = Gd, Y) coated conductors were previously determined. In this work, the effects of deposition temperature and oxygen partial pressure on the microstructure and the texture of (Gd, Y)Ba2Cu3O7-delta coated conductors with Zr content of 25 mol.%, grown by reel-to-reel metal organic chemical vapor deposition have been investigated. The results shows that the in-plane and out-of-plane texture quality of (Gd, Y) BCO coated conductors depend strongly on deposition temperature and oxygen partial pressure. It was also noticed that as (Gd, Y) BCO coated conductors become more Ba-rich, the overall in-plane texture quality deteriorates. The critical current density at 77 K, 0 T in 25 mol.% Zr-added (Gd, Y) BCO coated conductors is found to be sensitive to the (Ba+Zr)/Cu content in the films.