| 摘要 |
PURPOSE:To obtain a superconducting ceramic compsn. whose critical temp. at which the compsn. exhibits superconductivity is above the temp. of liq. nitrogen by specifying a compsn. consisting of rare earth elements, Ba, Cu and O and by using Y and Ho as the rare earth elements. CONSTITUTION:In a superconducting ceramic compsn. represented by a formula RBa2Cu3OX (where R is rare earth elements and 6<x<7), Y and Ho are used as the R. The critical temp. Tc of the compsn. at which the compsn. exhibits superconductivity can be increased to about 86-89K above the temp. (about 77K) of liq. nitrogen. High purity BaCO3, CuO, Y2O3 and Ho2O3 as starting materials are mixed in a prescribed ratio and calcined at about 900 deg.C in the air and this calcined product is pulverized, compacted and sintered at about 950 deg.C in the air to obtain the superconducting ceramic compsn. |
