(19)
(11)EP 0 323 003 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
23.08.1989 Bulletin 1989/34

(43)Date of publication A2:
05.07.1989 Bulletin 1989/27

(21)Application number: 88308478.2

(22)Date of filing:  14.09.1988
(51)International Patent Classification (IPC)4H01L 39/12, H01L 39/24
(84)Designated Contracting States:
DE FR GB IT NL

(30)Priority: 23.12.1987 GB 8730062

(71)Applicant: PLESSEY OVERSEAS LIMITED
Ilford Essex IG1 4AQ (GB)

(72)Inventors:
  • Dorey, Lynn Yvette
    Langlands Northampton, NN3 3HD (GB)
  • Wort, Christopher John
    Towcester Northants NN12 8NY (GB)

(74)Representative: Lupton, Frederick 
The Plessey Company plc Intellectual Property Dept. Vicarage Lane
Ilford, Essex IG1 4AQ
Ilford, Essex IG1 4AQ (GB)


(56)References cited: : 
  
      


    (54)Superconducting thin films


    (57) The invention relates to a method of protecting thin films of Y₁Ba₂Cu₃07-δ films from premature aging (resulting in a deterioration of superconducting properties) on atmospheric exposure, by applying a layer of silver which is impervious to water vapour but pervious to oxygen.





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