EP0280812A1
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EP
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Superconductivity in square - planar compound systems
Assignee: University of Houston
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Filing: 1987-11-11
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Granted: —
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Expires: 2007-11-11
Abstract
Abstract Described is a superconducting composition comprising an oxide complex of the formula [L 1-x M x ] a A b O y wherien L is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof provided that when "L" is lanthanum "M" is not barium; "A" is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, vanadium or a combination thereof "x" is from about 0.01 to about 1.0; "a" is 1 to 2; "b" is 1; and "y" is about 2 to about 4. The oxide complexes of the invention are prepared by a solid-state reaction procedure which produce oxide complexes having enhanced superconducting transition temperatures compared to an oxide complex of like empirical composition prepared by a co-precipitation - high temperature decomposition procedure. With a solid-state reaction prepared oxide complex of the invention a transition temperature as high as 100°K has been observed even under atmospheric pressure. There is also disclosed a method for conducting an electrical current using an oxide complex described above as conductor material.
Inventors
- 👤 Chung-Wu Dep. Nat. Sc. And Math. Chu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:02
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/006; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4521; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/80; H10N60/85; H10N60/855; H10N60/857; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/76; C01P2002/77; C01P2006/00; C01P2006/42
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
162 words
A method for conducting an electrical current within a conductor material without electrical resistive losses, characterized by the steps of: utilizing as the conductor material a metal oxide complex of the formula wherein "L" is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof provided that when "L" is lanthanum "M" is not barium; "A" is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, vanadium or a combination thereof; "x" is from about 0.01 to about 1.0; "a" is 1 to 2; "b" is 1; and "y" is about 2 to about 4; cooling said metal oxide complex to a temperature at or below that at which said metal oxide complex becomes superconductive; and initiating a flow of electrical current within said metal oxide complex while maintaining said metal oxide complex at or below the temperature at which it becomes superconductive.
Claim 2
Independent Claim
162 words
A method for conducting an electrical current within a conductor material without electrical resistive losses, characterized by the steps of: utilizing as the conductor material a metal oxide complex of the formula wherein "L" is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof provided that when "L" is lanthanum "M" is not barium; "A" is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, vanadium or a combination thereof; "x" is from about 0.01 to about 1.0; "a" is 1 to 2; "b" is 1; and "y" is about 2 to about 4; cooling said metal oxide complex to a temperature at or below that at which said metal oxide complex becomes superconductive; and initiating a flow of electrical current within said metal oxide complex while maintaining said metal oxide complex at or below the temperature at which it becomes superconductive.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, characterized in that "M" is barium or strontium, "A" is copper, and "x" is from about 0.075 to about 0.5.
Claim 4
Independent Claim
150 words
A method for conducting an electrical current within a conductor material without electrical resistive losses, characterized by the steps of: utilizing as the conductor material a metal oxide complex of the formula wherein "L" is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof; "A" is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, vanadium, or a combination thereof; "x" is from about 0.65 to about 0.80; "A" is 1; "b" is 1; and "y" is about 2 to about 4; cooling said metal oxide complex to a temperature at or below that at which said metal oxide complex becomes superconductive; and initiating a flow of electrical current within said metal oxide complex while maintaining said metal oxide complex at or below the temperature at which it becomes superconductive.
Claim 5
Independent Claim
150 words
A method for conducting an electrical current within a conductor material without electrical resistive losses, characterized by the steps of: utilizing as the conductor material a metal oxide complex of the formula wherein "L" is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof; "A" is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, vanadium, or a combination thereof; "x" is from about 0.65 to about 0.80; "A" is 1; "b" is 1; and "y" is about 2 to about 4; cooling said metal oxide complex to a temperature at or below that at which said metal oxide complex becomes superconductive; and initiating a flow of electrical current within said metal oxide complex while maintaining said metal oxide complex at or below the temperature at which it becomes superconductive.
Claim 6
Dependent Claim
23 words
A method as claimed in claim 3, characterized in that "M" is barium or strontium, "A" is copper, and "x" is about 0.667.
Claim 7
Dependent Claim
30 words
A method as claimed in claim 3 or 4, characterized in that the oxide complex has the formula and a has a number value from about 0.1 to about 4.5.
Claim 8
Dependent Claim
21 words
A method as claimed in claim 5, characterized in that a has a number value from about 0.1 to about 1.0.
Claim 9
Dependent Claim
98 words
A composition which is superconductive at a temperature at 40°K and higher, characterized by: a sintered metal oxide complex of the formula wherein: "L" is yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dyprosium, holmium, erbium, thulium, ytterbium, or lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof provided that when "L" is lanthanum "M" is not barium; "A" is copper, bismuth, tungsten, zirconium, tantalum niobium, vanadium; "x" is from about 0.01 to 1.0; "a" is 1 to 2; "b" is 1; and "y" is about 2 to about 4.
Claim 10
Dependent Claim
98 words
A composition which is superconductive at a temperature at 40°K and higher, characterized by: a sintered metal oxide complex of the formula wherein: "L" is yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dyprosium, holmium, erbium, thulium, ytterbium, or lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof provided that when "L" is lanthanum "M" is not barium; "A" is copper, bismuth, tungsten, zirconium, tantalum niobium, vanadium; "x" is from about 0.01 to 1.0; "a" is 1 to 2; "b" is 1; and "y" is about 2 to about 4.
Claim 11
Dependent Claim
88 words
A composition which is superconductive at a temperature of 40° K and higher, characterized by: a sintered metal oxide complex of the formula wherein: "L" is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dyprosium, holmium, erbium, thulium, ytterbium, or lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof; "A" is copper, bismuth, tungsten, zirconium, tantalum, niobium, vanadium, "x" is from about 0.65 to 0.80; "a" is 1; "b" is 1; and "y" is about 2 to about 4.
Claim 12
Dependent Claim
88 words
A composition which is superconductive at a temperature of 40° K and higher, characterized by: a sintered metal oxide complex of the formula wherein: "L" is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dyprosium, holmium, erbium, thulium, ytterbium, or lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury, or a combination thereof; "A" is copper, bismuth, tungsten, zirconium, tantalum, niobium, vanadium, "x" is from about 0.65 to 0.80; "a" is 1; "b" is 1; and "y" is about 2 to about 4.
Claim 13
Dependent Claim
22 words
A superconductive composition as claimed in claim 7 or 8, characterized in that "M" is barium or strontium, and "A" is copper.
Claim 14
Dependent Claim
32 words
A superconductive composition as claimed in any one of claims 7 to 9 wherein the oxide complex has the formula and a has a number value from about 0.1 to about 4.5.
Claim 15
Dependent Claim
30 words
A superconductive composition as claimed in claim 10, characterized in that "M" is barium or strontium, "A" is copper and a has a number value of about 0.1 to 1.0.
Claim 16
Independent Claim
164 words
A method for making a superconducting metal oxide complex, characterized by the steps of: mixing solid compounds containing L, M, A and 0 in amounts appropriate to yield the formula (L 1-x M x )- a A b Oywherein "L" is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury or a combination thereof; "A" is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, vanadium or a combination thereof; "a" is 1 to 2; "b" is 1; "x" is about 0.01 to about 1.0; and "y" is about 2 to about 4; compacting the mixture into a solid mass by application of pressure from about 100 to about 30,000 psi; heating the solid mass to a temperature of from about 800 to about 1000°C for a time sufficient to react and compacted mixutre in the solid state; and quenching the solid mass to ambient temperature in air.
Claim 17
Independent Claim
164 words
A method for making a superconducting metal oxide complex, characterized by the steps of: mixing solid compounds containing L, M, A and 0 in amounts appropriate to yield the formula (L 1-x M x )- a A b Oywherein "L" is scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or a combination thereof; "M" is barium, strontium, calcium, magnesium, mercury or a combination thereof; "A" is copper, bismuth, titanium, tungsten, zirconium, tantalum, niobium, vanadium or a combination thereof; "a" is 1 to 2; "b" is 1; "x" is about 0.01 to about 1.0; and "y" is about 2 to about 4; compacting the mixture into a solid mass by application of pressure from about 100 to about 30,000 psi; heating the solid mass to a temperature of from about 800 to about 1000°C for a time sufficient to react and compacted mixutre in the solid state; and quenching the solid mass to ambient temperature in air.
Claim 18
Dependent Claim
29 words
A method as claimed in claim 12, characterized in that "M" is barium or strontium, "A" is copper, "x" is about 0.65 to about 0.80 and "a" is 1.
Claim 19
Dependent Claim
35 words
A method as claimed in claim 12 or 13, characterized in that the solid mass is heated under a reduced oxygen atmosphere of about 2000u. at a temperature of from about 820°C to about 950°C.
References Cited (Backward Citations)
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