Process for making 90 K superconductors
This patent describes an improved process for preparing a superconducting composition having the formula MBa{sub 2}Cu{sub 3}O{sub x} wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu; x is from about 6.5 to 7.0; the composition having a superconducting transition temperature of about 90K; the process consisting essentially of mixing M{sub 2}O{sub 3}, BaO{sub 2} and CuO in an atomic ratio of M:Ba:Cu of about 1:2:3 to obtain a powder mixture; heating the resulting mixture in an oxygen-containing atmosphere at a temperature from about 850{degrees} C. to about 925{degrees} C. for a time sufficient to form MBa{sub 2}Cu{sub 3}O{sub y}, where y is from about 6.0 to about 6.4; and maintaining the MBa{sub 2}Cu{sub 3}O{sub y} in an oxygen-containing atmosphere while cooling for a time sufficient to obtain the desired product, the process not requiring additional heating steps.
- Assignee:
- E.I. DuPont de Nemours and Co., Wilmington, DE (USA)
- Patent Number(s):
- US 5036043; A
- Application Number:
- PPN: US 7-529752
- OSTI ID:
- 5730982
- Resource Relation:
- Patent File Date: 24 May 1990
- Country of Publication:
- United States
- Language:
- English
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