Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Coating
Patent
1991-12-16
1994-06-21
King, Roy
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Coating
505732, 505730, 427 62, 427596, 427314, 4271263, 427595, B05D 306, B05D 512
Patent
active
053228170
ABSTRACT:
In situ vapor phase growth of thallium containing superconductors is achieved by controlling thallium volatility. Thallium volatility is controlled by providing active oxygen at the surface of the growing material and by avoiding collisions of energetic species with the growing material. In the preferred embodiment, a thallium containing superconductor is grown by laser ablation of a target, and by provision of oxygen during growth. More specifically, a source of thallium, calcium, barium, copper and oxygen is created by laser ablation of a thallium rich target, generating an ablation plume that is directed onto a heated substrate through the oxygen, with the plume passing through oxygen having a pressure from 10.sup.-2 to ten torr. Epitaxial superconducting thin films of thallium, calcium, barium, copper and oxygen have been grown by this technique. Various superconducting phases may be engineered through use of this method.
REFERENCES:
patent: 4878989 (1989-11-01), Purdes
patent: 4950642 (1990-08-01), Okamoto et al.
Eckstein et al, "Automatically Layers Heteroepitaxial . . . " Appl. Phys. Ltrs. 57 (9), 27 Aug. 1990, pp. 1049-1051.
Eckstein et al, "Growth of Untwinned Bi2Sr2Ca2Cu3Ox Thin . . . " Appl. Phys. Ltrs. 57 (10), 3 Sep. 1990, pp. 931-933.
Koren et al, "Role of Atomic Oxygen in the Low-Temperature Growth of YBa.sub.2 Cu.sub.3 O.sub.7-8 Thin Films by Laser Ablation Deposition", Appl. Phys. Lett. 54(19) May 1989, pp. 1920-1922.
Nakayama et al, "In Situ Growth of Bi-Si-Ca-Cu-O Thin Films by Molecular Beam Epitaxy Technique with Pure Ozone" Jpn. J. Appl. Phys. vol. 28(7) July 1989 L1217-1219.
Liou et al, "Pulsed laser evaporation of Tl-Ba-Ca-Cu-O Films", Proc. of the Conference on the Sci. and Technology of Thin Film Superconductors, (Colorado Springs, Colo.) Nov. 1988 pp. 35-43.
Nabatame et al, "Properties of Tl.sub.2 Ba.sub.2 Ca.sub.2 Cu.sub.3 Ox Thin films with a critical temperature of 122K prepared by Excimer laser Ablation," Jpn. J. Appl. Phys. 29(10) Oct. 1990 L813-5.
Hong et al, "Superconductivity Tl-Ba-Ca-Cu-O films by sputtering", Appl. Phys. lett. 53(21) Nov. 1988 pp. 2102-2104.
Ginley et al, "Sequential electron beam evaporated films of Tl.sub.2 CaBa.sub.2 Cu.sub.2 Oy with zero resistance at 97K", Appl. Phys. lett. 5-3(5) Aug. 1988 pp. 406-408
Kwo et al, "In Situ epitaxial growth of Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x films by molecular beam epitaxy with an activated oxygen source", Appl. Phys. let. 53(26) Dec. 1988 pp. 2683-85.
Hase et al, "Partial oxygen pressure effects on the morphology of Y-Ba-Cu-O thin films in laser deposition process", J. Appl. Phys. 68(1) Jul. 1990 pp. 374-376.
Witanachchi et al, "Deposition of superconducting Y-Ba-Cu-O films at 400.degree.C. without post-annealing", Appl. Phys. lett. 53(3) Jul. 1988 pp. 235-236.
Berkley et al, "In Situ formation of superconducting YBa.sub.2 Cu.sub.3 O.sub.7-x thin films using pure ozone vapor oxidation", Appl. Phys. lett. 53(20) Nov. 1988, pp. 1973-1975.
James Timothy W.
Nilsson Boo J. L.
King Roy
Superconductor Technologies Inc.
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