Multilayer deposition method for forming Pb-doped Bi-Sr-Ca-Cu-O

Details Multilayer deposition method for forming Pb-doped Bi-Sr-Ca-Cu-O Multilayer deposition method for forming Pb-doped Bi-Sr-Ca-Cu-O

1990-08-09

1992-08-25

Lusignan, Michael

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505742, 505731, 505732, 427 62, 4274192, 4274193, 4271263, B05D 512

Patent

active

051419173

ABSTRACT:
A perovskite type superconductor film having a high content, almost a single phase, of the high Tc phase is formed by the steps of: depositing at least one first film of a first material (e.g., a composite oxide of Bi-Sr-Ca-Cu-O system or Tl-Ba-Ca-Cu-O system) constituting a perovskite type superconductor over a substrate; depositing at least one second film of a second material containing an oxide or element (Bi.sub.2 O.sub.3, Tl.sub.2 O.sub.3, PbO.sub.x, etc., particularly PbO.sub.x) having a vapor pressure of more than 10 .sup.-4 Pa at 800.degree. C. at least as a main component over the substrate; to thereby form a stack of the first and second films; and heat treating the stack of the first and second films to form the perovskite type superconductor film on the substrate. Further, preferred compositions of the as-deposited films or stack are determined.

REFERENCES:
Lee et al, "Superconducting Tl-Ca-Ba-Cu-O thin films with zero resistance at temperature of up to 120 K", Appl. Phys. lett. 53(4) Jul. 1988 pp. 329-331.
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Ichikawa et al, "Highly oriented superconducting Tl-Ca-Ba-Cu oxide thin films with 2-1-2-2 phase", Appl. Phys. lett. 53(10) Sep. 1988 pp 919-921.
Koyama et al "Preparation of Single 110 K Phase of the Bi-Pb-Sr-Ca-Cu-O Superconductor" Jpn. J. Appl. Phys. vol. 27(10) Oct. 1988, L1861-1863.
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Kuroda et al "Preparation of New high-T.sub.c Superconducting Oxide Bi-Sr-Ca-Cu-O Thin Film by Electron Beam Deposition Technique" Jpn. J. Appl. Phys. vol. 27(4) Apr. 1988 L625-627.
Chemical & Engineering News, vol. 66, no. 20, May 16, 1988, pp. 24-29, Washington, DC, US; R. Dagani: "New class of superconductors pushing temperatures higher".
Applied Physics Letters, vol. 53, no. 18, Oct. 31, 1988, pp. 1759-1761, American Institute of Physics, New York, NY, US; R. Ramesh et al. "Microstructure of Pb-modified Bi-Ca-Sr-Cu-O superconductor" p. 1759.
Nature, vol. 332, Mar. 10, 1988, p. 138; Z. Z. Sheng et al. "Bulk superconductivity at 120 K in the Tl-Ca/Ba-Cu-O system".

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