PROCESS FOR PREPARING YTTRIUM-BARIUM-COPPER OXIDE Russian patent published in 1994 - IPC

FIELD: preparation of yttrium-barium-copper oxide Ba₂Cu₃O_7-δ. SUBSTANCE: yttrium, barium and copper are precipitated in the form of an oxalate precipitate from a nitrite solution. In order to precipitate, the precipitant is a sodium-oxalate solution containing sodium hydroxide. The precipitation is carried out at a pH of 9.6-9.8. The precipitate is washed with water and alcohol heat treated at 800 C for 5 hr and at 920 C for 6 hr and is then subjected to oxidizing roasting in a stream of oxygen at 350 C. EFFECT: improved process. 1 tbl