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 REBa
₂
Cu
₃
O
_7−δ
(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)Ba
₂
Cu
₃
O
_7-δ
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.