Melt-produced, high temperature superconductors have preferred compositions of R-Ba-Cu-O wherein R is chosen from the group of rare earth metals excluding: Praseodymium; Cerium; and Terbium. They can be made at a relatively low temperature of about 950° C, and the process allows fabrication of melt-produced high temperature superconductors of arbitrary shape.
US4857504; AU604362 (B2); CA1339692 (C); JPH0764627 (B2)
University of Arkansas (Fayetteville, AR)
Hermann, Allen M. and Sheng, Zhengzhi, "Melt-produced high temperature superconductor" (1989). Patents Granted. 259.