CERAMIC MATERIAL Russian patent published in 1995 - IPC

FIELD: cryoelectronics. SUBSTANCE: object of invention resides in production of a ceramic material whose crystalline lattice coincides with lattice IBa₂Cu₃O_7-y and whose specific resistance changes gradually at a temperature of liquid nitrogen from that corresponding to normal conductor to insulator. This is achieved in ceramic material based on oxides of yttrium, copper and barium characterized in that it contains additionally niobium oxide at the following proportions of components IBa₂Cu_3-xNb_xO₇ where 1≅ x ≅3. EFFECT: improved composition of material.