| abstract |
A superconductive oxide material which consists, at least partially, of ABiCuO, where A is a mixture of at least one of Mg and Ca and at least one of Sr and Ba, the atomic ratio of A/Bi/Cu falling within a pentagonal area in a ternary composition diagram of A, Bi and Cu, defined by the points 3/2/3, 5/3/5, 6/3/5, 4/2/3 and 6/4/5 and the material having a superconductive transition temperature above 84°K |