PRODUCTION OF RAW POWDER FOR HIGH-TEMPERATURE SUPERCONDUCTING CERAMIC

摘要

PURPOSE:To obtain the title easy-to-sinter raw powder for a superconducting ceramic by forming a precipitate from a mixed soln. of a Bi salt, an alkaline earth element salt, and a copper salt and a specified mixed soln., and sintering the precipitate. CONSTITUTION:A mixed soln. of a bismuth salt, an alkaline-earth element salt, and a copper salt is brought into contact with a mixed soln. of an ammonium salt and an amine to form a precipitate, and the precipitate is water- washed or not, separated by filtration, dried, and then calcined to obtain the desired raw powder. The raw powder is shown by the formula (A is Mg, Ca, Ba, and Sr). In the formula, two kinds of the alkaline-earth elements mentioned above are preferably combined and used as A, or more preferably Ca and Sr are combined. In addition, 1x4, 0.8y2.5, and 4z7 are preferably fulfilled. When two kinds of alkaline-earth elements are combined and used as A, the ratio of the two kinds is preferably controlled to 0.5w-1.5 or more preferably to about 1.