| 摘要 |
Vanadium-containing superconducting oxides are disclosed having critical temperature (Tc) values of above about 100 DEG K. and preferably about 110 DEG -150 DEG K., together with predicted current density (Jc) values on the order of 104-105 amperes/cm2. The oxides hereof are moreover relatively ductile and easily bulk sintered to give end products having desirable superconductivity characteristics. Certain preferred oxides of the invention are defined by the general formula: (V1-xMx)i(A1-yMy)jQkCumOr+/-t I. where M is selected from the group consisting of bismuth, lead and antimony, A is selected from the group consisting of calcium, sodium and potassium, Q is different than A and is selected from the group consisting of strontium, barium and calcium, x and t are individual numbers each respectively ranging from 0 to less than 1, i is either 2 or 3, j is either 0, 1 or 2, k is 2 or 3, m is either 1, 2 or 3, and r is an integer. Other preferred oxides are defined by the formula Bi2-p-qVpPbqSr2Ca2Cu3O10+/-t II. where p and q independently range up to about 0.7 and t is from 0 to less than l. |
