METHOD OF PRODUCING HIGH-TEMPERATURE SUPERCONDUCTING CERAMICS BiSrCaCuO Russian patent published in 2019 - IPC C04B35/45 C04B35/453 C04B35/653 

FIELD: technological processes.

SUBSTANCE: invention relates to synthesis of superconducting high-temperature Bi₂Sr₂CaCu₂O₈ ceramics, which can be used to produce targets, rods, conductors and crystal growth. Disclosed is a method in which taken in stoichiometric ratio initial powders of Bi₂O₃; CaCO₃; SrCO₃ and CuO are thoroughly mixed, mixture is annealed in furnace, cooled and grinded, repeating specified operations before occurrence of superconducting phase in amount of about 60 %. Part of obtained powder is compacted to density of not less than 4 g/cm³ is placed into crucible and loaded into vertical tubular furnace with strictly vertical temperature gradient and heated so that temperature in crucible exceeds melting point of obtained Bi₂Sr₂CaCu₂O₈ ceramics (880 °C). From the remaining part of the powder, a rod is made, which, suspended by one end, is lowered into the said vertical tubular furnace until contact with the melt, and after equalizing melt temperature and rod end temperature in furnace is reduced by 1 °C per hour, until temperature on melt surface reaches 860 °C, then completely switching off furnace heating and leaving furnace with content to cool down to ambient temperature. Obtained product is a built-up edge on a button in the form of a biconvex lens.

EFFECT: providing irreversible synthesis of Bi₂Sr₂CaCu₂O₈ with output of superconducting phase of more than 90 % without impurities, negatively affecting superconducting properties of ceramics.

1 cl, 2 ex, 1 dwg