EP0357507A2
Expired / Lapsed
EP
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Superconducting article containing thallium
Assignee: Clearday Inc
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Filing: 1989-08-30
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Granted: —
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Expires: 2009-08-30
Abstract
Abstract Methods, compositions and devices are provided employing thallium superconducting layers on crystalline substrates. The superconducting layers are formed in a variety of ways, particularly by metal carboxylate pyrolysis or ablation followed by thermal annealing. Microwave and millimeter wave devices are described.
Inventors
- 👤 William L. Olson
- 👤 Michael M. Eddy
- 👤 Timothy W. James
- 👤 Mcdonald Robinson
- 👤 Robert B. Hammond
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 02:08
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/087; H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0521; H10N60/0548; H10N60/20; H10N60/203
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
39 words
A superconducting article comprising an oriented superconducting layer of thallium, optionally calcium, barium, and copper oxide on a crystalline substrate, said layer being at least 30 Angstroms thick and having a c-axis oriented normal to the crystalline substrate surface.
Claim 2
Dependent Claim
39 words
A superconducting article comprising an oriented superconducting layer of thallium, optionally calcium, barium, and copper oxide on a crystalline substrate, said layer being at least 30 Angstroms thick and having a c-axis oriented normal to the crystalline substrate surface.
Claim 3
Dependent Claim
16 words
A superconducting article according to Claim 1 wherein said superconducting layer is epitaxial to said substrate.
Claim 4
Dependent Claim
15 words
A superconducting article according to Claim 1, wherein said superconducting layer has the 2122 composition.
Claim 5
Dependent Claim
15 words
A superconducting article according to Claim 1, wherein said superconducting layer has the 2223 composition.
Claim 6
Dependent Claim
17 words
A superconducting article according to Claim 1, wherein said substrate is magnesium oxide or yttria stabilized zirconia.
Claim 7
Dependent Claim
18 words
A superconducting article comprising an superconducting epitaxial layer of thallium, barium, calcium and copper oxide on magnesium oxide.
Claim 8
Dependent Claim
18 words
A superconducting article comprising an superconducting epitaxial layer of thallium, barium, calcium and copper oxide on magnesium oxide.
Claim 9
Dependent Claim
15 words
A superconducting article according to Claim 6, wherein said superconducting layer is the 2122 composition.
Claim 10
Dependent Claim
28 words
A microwave or millimeter device comprising an article according to any of Claims 1, 6 and 7, wherein said superconducting layer is under about 1 micrometer in thickness.
Claim 11
Dependent Claim
98 words
A digital instantaneous frequency measurement device comprising: a diode in signal receiving relationship from an antenna; a power splitter; a phase detector; a delay line comprising an oriented superconducting layer of thallium, optionally calcium, barium, and copper oxide on a crystalline substrate, said layer being at least about 30 Angstroms thick and having a c-axis oriented normal to the crystalline substrate surface, said layer being in the form of an extended wire; means connecting said diode to said power splitter and said power splitter to said phase detector; and means for connecting said phase detector to an output.
Claim 12
Dependent Claim
98 words
A digital instantaneous frequency measurement device comprising: a diode in signal receiving relationship from an antenna; a power splitter; a phase detector; a delay line comprising an oriented superconducting layer of thallium, optionally calcium, barium, and copper oxide on a crystalline substrate, said layer being at least about 30 Angstroms thick and having a c-axis oriented normal to the crystalline substrate surface, said layer being in the form of an extended wire; means connecting said diode to said power splitter and said power splitter to said phase detector; and means for connecting said phase detector to an output.
Claim 13
Dependent Claim
109 words
A microwave receiver comprising: a microwave filter for receiving a signal from an antenna, said filter comprising an oriented superconducting layer of thallium, optionally calcium, barium, and copper oxide on a crystalline substrate, said layer being at least about 30 Angstroms thick and having a c-axis oriented normal to the crystalline substrate surface, wherein said layer is in the form of stepped strips coated onto said substrate; a mixer; a swept local oscillator; a dispersive delay line; means for connecting said microwave filter and swept local oscillator to said mixer and said mixer to said dispersive delay line; and means for connecting said dispersive delay line to an output.
Claim 14
Dependent Claim
109 words
A microwave receiver comprising: a microwave filter for receiving a signal from an antenna, said filter comprising an oriented superconducting layer of thallium, optionally calcium, barium, and copper oxide on a crystalline substrate, said layer being at least about 30 Angstroms thick and having a c-axis oriented normal to the crystalline substrate surface, wherein said layer is in the form of stepped strips coated onto said substrate; a mixer; a swept local oscillator; a dispersive delay line; means for connecting said microwave filter and swept local oscillator to said mixer and said mixer to said dispersive delay line; and means for connecting said dispersive delay line to an output.
Claim 15
Independent Claim
89 words
A method for producing a superconducting article comprising an oriented superconducting layer of thallium, optionally calcium, barium and copper oxide, said layer being at least 30 Å thick and having a c-axis oriented normal to the crystalline substrate surface, said method comprising: coating a crystalline substrate surface with a liquid phase containing thallium, calcium, barium and copper oxides at an elevated temperature; and cooling said solution, whereby said metal oxides crystallize on the surface to form a superconductive layer of said metal oxides as an oxide on said substrate.
Claim 16
Independent Claim
89 words
A method for producing a superconducting article comprising an oriented superconducting layer of thallium, optionally calcium, barium and copper oxide, said layer being at least 30 Å thick and having a c-axis oriented normal to the crystalline substrate surface, said method comprising: coating a crystalline substrate surface with a liquid phase containing thallium, calcium, barium and copper oxides at an elevated temperature; and cooling said solution, whereby said metal oxides crystallize on the surface to form a superconductive layer of said metal oxides as an oxide on said substrate.
Claim 17
Independent Claim
107 words
A method for producing a superconducting article comprising an oriented superconducting layer of thallium, optionally calcium, barium and copper oxide, said layer being at least 30 Å thick and having a c-axis oriented normal to the crystalline substrate surface, said method comprising: coating a crystalline substrate surface with a solution of thallium, calcium, barium and copper carboxylate soaps to produce a coating; pyrolyzing said soap coating at an elevated temperature in the presence of oxygen and an overpressure of at least thallium oxide of said oxides in a predetermined ratio for sufficient time to produce a superconductive layer of said metals as an oxide on said substrate.
Claim 18
Independent Claim
107 words
A method for producing a superconducting article comprising an oriented superconducting layer of thallium, optionally calcium, barium and copper oxide, said layer being at least 30 Å thick and having a c-axis oriented normal to the crystalline substrate surface, said method comprising: coating a crystalline substrate surface with a solution of thallium, calcium, barium and copper carboxylate soaps to produce a coating; pyrolyzing said soap coating at an elevated temperature in the presence of oxygen and an overpressure of at least thallium oxide of said oxides in a predetermined ratio for sufficient time to produce a superconductive layer of said metals as an oxide on said substrate.
Claim 19
Dependent Claim
27 words
A method according to Claim 12, wherein said overpressure is supplied by pellets of at least thallium and calcium oxide mechanically removed from contact with said coating.
Claim 20
Dependent Claim
21 words
A method according to Claim 12, including the additional step of prepyrolyzing said soaps at a lower temperature than said pyrolyzing.
Claim 21
Dependent Claim
34 words
A method according to Claim 14 wherein said prepyrolyzing is at a temperature in the range of 250 to 450°C and said pyrolyzing is at a temperature in the range of 700 to 950°C.
Claim 22
Dependent Claim
16 words
A method according to Claim 12, wherein said substrate is magnesium oxide or yttria stabilized zirconia.
Claim 23
Independent Claim
100 words
A method for forming a superconductive film consisting essentially of thallium, barium, calcium and copper oxide employing laser ablation in an oxidizing atmosphere, said method comprising: laser ablating a target comprising thallium, optionally calcium, barium and copper oxides in a thallium and oxidizing atmosphere comprising an oxygen source in the presence of a target, whereby a plume of atoms is formed and directed to said target and said atoms impinge and bind to said target surface; annealing under conditions to form a high temperature superconducting composition; and cooling said atoms on said target surface to form a superconductive oxide layer.
Claim 24
Independent Claim
100 words
A method for forming a superconductive film consisting essentially of thallium, barium, calcium and copper oxide employing laser ablation in an oxidizing atmosphere, said method comprising: laser ablating a target comprising thallium, optionally calcium, barium and copper oxides in a thallium and oxidizing atmosphere comprising an oxygen source in the presence of a target, whereby a plume of atoms is formed and directed to said target and said atoms impinge and bind to said target surface; annealing under conditions to form a high temperature superconducting composition; and cooling said atoms on said target surface to form a superconductive oxide layer.
Claim 25
Independent Claim
118 words
A method for producing a superconducting article comprising an oriented superconducting layer of thallium, optionally calcium, barium and copper oxide, said layer being at least 30 Å thick and having a c-axis oriented normal to the crystalline substrate surface, said method comprising: heating to an elevated temperature a mixture of thallium, optionally calcium, barium and copper oxides to form a liquid of an appropriate composition for formation of a crystalline superconductive layer; immersing said crystalline substrate in said liquid at said elevated temperature; cooling said liquid by from about 10 to 50°C or evaporating a portion of said liquid inducing crystallization of a superconductor and removing the main body of said liquid leaving a layer on said substrate.
Claim 26
Independent Claim
118 words
A method for producing a superconducting article comprising an oriented superconducting layer of thallium, optionally calcium, barium and copper oxide, said layer being at least 30 Å thick and having a c-axis oriented normal to the crystalline substrate surface, said method comprising: heating to an elevated temperature a mixture of thallium, optionally calcium, barium and copper oxides to form a liquid of an appropriate composition for formation of a crystalline superconductive layer; immersing said crystalline substrate in said liquid at said elevated temperature; cooling said liquid by from about 10 to 50°C or evaporating a portion of said liquid inducing crystallization of a superconductor and removing the main body of said liquid leaving a layer on said substrate.
Claim 27
Independent Claim
111 words
A method for producing a superconducting article comprising an oriented superconducting layer of thallium, calcium, barium and copper oxide, said layer being at least 30 Å thick and having a c-axis oriented normal to the crystalline substrate surface, said method comprising: coating said substrate with a first coating of a thallium and calcium oxide; coating said first coating with a second coating comprising barium and copper oxide, wherein the atomic ratio is appropriate for formation of a superconductive layer; heating said coatings to a liquefying temperature, whereby said thallium and calcium oxides form a liquid which dissolves said barium and copper oxides; and cooling said liquid to form a superconductive layer.
Claim 28
Independent Claim
111 words
A method for producing a superconducting article comprising an oriented superconducting layer of thallium, calcium, barium and copper oxide, said layer being at least 30 Å thick and having a c-axis oriented normal to the crystalline substrate surface, said method comprising: coating said substrate with a first coating of a thallium and calcium oxide; coating said first coating with a second coating comprising barium and copper oxide, wherein the atomic ratio is appropriate for formation of a superconductive layer; heating said coatings to a liquefying temperature, whereby said thallium and calcium oxides form a liquid which dissolves said barium and copper oxides; and cooling said liquid to form a superconductive layer.
References Cited (Backward Citations)
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