反应详情

Process according to claim 4 wherein carbon dioxide is passed through aqueous tetraethylammonium hydroxide to a pH of 8.3 to form tetraethylammonium carbonate plus dissolved carbon dioxide; adding the said tetraethylammonium carbonate to an aqueous solution of nitrates of yttrium, barium, and copper in a Y:Ba:Cu atomic ratio of 1:2:3 at a pH of about 7.7-8.0, thereby to precipitate the said Y, Ba, and Cu as carbonates; recovering and drying the precipitate; calcining the dried precipitate at about 950° C. and cooling the calcined product to about 150° C. over 8 hours.