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按摩尔比Y:Ba:Cu=1:2:3称取Y_2O_3(5N)、BaCO_3(A.R.)和CuO(A.R.)。先将Y_2O_3放入大烧杯中,加适量65％～68％的HNO_3,加热使之反应溶解为无色透明溶液;再加入CuO和蒸馏水,溶解为蓝色溶液;加HNO_3和蒸馏水,倒入BaCO_3,加热至溶液透明。再加进与金属原子总数比1:1的柠檬酸,不断搅拌使之溶解。以分析纯的氨水调节pH到6-7,得到蓝黑色透明溶液。将该溶液在电炉上加热沸腾,接近蒸干时溶液不断鼓泡,成为胶状溶液。最后
Y_2O_3 (5N), BaCO_3 (A.R.) and CuO (A.R.) were weighed according to molar ratio Y: Ba: Cu = 1: 2: 3. First Y_2O_3 into a large beaker, add the appropriate amount of 65% to 68% of HNO_3, heated to dissolve the reaction was colorless and transparent solution; then add CuO and distilled water, dissolved in blue solution; add HNO_3 and distilled water, into the BaCO_3 , Heat until the solution is clear. Then add to the total number of metal atoms 1: 1 citric acid, stirring to dissolve. Adjust the pH to 6-7 with analytically pure ammonia to give a blue-black clear solution. The solution was heated and boiled on the electric furnace, close to the evaporation of the solution constantly bubbling, into a colloidal solution. At last