Bismuth-containing superconducting material and process for...

Details Bismuth-containing superconducting material and process for... Bismuth-containing superconducting material and process for...

H - Electricity

01

L

H01L 39/12 (2006.01) C04B 35/45 (2006.01)

Patent

CA 2063313

- 1 - HOECHST AKTIENGESELLSCHAFT HOE 91/F083 Abstract of the disclosure Bismuth-containing superconducting material and process for producing it The invention relates to an oxide-ceramic superconducting material which contains bismuth, strontium, calcium and copper, having an overall composition of BiyCa2Sr2Cu3Ox, where y is an integer from 2.35 to 2.6 and x is about 10 to 12. The material has a critical temperature To above 105 K and has a proportion of the phase Bi2Sr2Ca2Cu3Ox of at least 85% by volume. The invention also relates to a process for producing a bismuth-containing supercon- ducting material which comprises holding the oxides or oxide precursors of bismuth, strontium, calcium and copper at a temperature in the range from 850 to 890°C over a time span of a plurality of hours and adhering to the following atomic ratios: Bi : Cu > 2 : 3 Ca : Sr = 0.9 to 1.50 .SIGMA. (Sr + Ca) : Cu = 4.2 : 3 to 4 : 3.33 Bi : .SIGMA. (Sr + Ca) = 2.35 : 4 to 3.1 : 4

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