HUT52646A - Method for making super-conducting substance with critical temperature of 90 kelvin grades - Google Patents

Method for making super-conducting substance with critical temperature of 90 kelvin grades Download PDF

Info

Publication number: HUT52646A
Authority: HU; Hungary
Prior art keywords: precursor powder; temperature; process according; oxygen; superconducting
Prior art date: 1987-06-09

Application number

HU884759A

Other languages

English (en)

Hungarian (hu)

Inventor

Carmine Torardi

Original Assignee

Du Pont

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1987-06-09

Filing date

1988-06-08

Publication date

1990-07-28

1988-06-08 Application filed by Du Pont filed Critical Du Pont

1990-07-28 Publication of HUT52646A publication Critical patent/HUT52646A/hu

Links

238000000034 method Methods 0.000 title claims abstract description 38
239000000126 substance Substances 0.000 title description 5
239000000203 mixture Substances 0.000 claims abstract description 67
239000000843 powder Substances 0.000 claims abstract description 60
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 38
229910052760 oxygen Inorganic materials 0.000 claims abstract description 38
239000001301 oxygen Substances 0.000 claims abstract description 38
230000008569 process Effects 0.000 claims abstract description 33
239000002243 precursor Substances 0.000 claims abstract description 31
239000000243 solution Substances 0.000 claims abstract description 19
239000007864 aqueous solution Substances 0.000 claims abstract description 13
229910052751 metal Inorganic materials 0.000 claims abstract description 11
239000002184 metal Substances 0.000 claims abstract description 11
150000002739 metals Chemical class 0.000 claims abstract description 11
YASYEJJMZJALEJ-UHFFFAOYSA-N Citric acid monohydrate Chemical compound O.OC(=O)CC(O)(C(O)=O)CC(O)=O YASYEJJMZJALEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
229910052691 Erbium Inorganic materials 0.000 claims abstract description 8
229910052693 Europium Inorganic materials 0.000 claims abstract description 8
229910052765 Lutetium Inorganic materials 0.000 claims abstract description 8
229960002303 citric acid monohydrate Drugs 0.000 claims abstract description 8
229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 7
229910052689 Holmium Inorganic materials 0.000 claims abstract description 7
229910052772 Samarium Inorganic materials 0.000 claims abstract description 7
238000002156 mixing Methods 0.000 claims abstract description 7
229910052692 Dysprosium Inorganic materials 0.000 claims abstract description 6
229910052779 Neodymium Inorganic materials 0.000 claims abstract description 6
229910052775 Thulium Inorganic materials 0.000 claims abstract description 6
229910052727 yttrium Inorganic materials 0.000 claims abstract description 5
150000001860 citric acid derivatives Chemical class 0.000 claims abstract description 4
238000001694 spray drying Methods 0.000 claims abstract description 3
239000000463 material Substances 0.000 claims description 63
238000010304 firing Methods 0.000 claims description 14
-1 BaCOH 2 .e 2 O Inorganic materials 0.000 claims description 5
239000012254 powdered material Substances 0.000 claims description 4
229910017976 MgO 4 Inorganic materials 0.000 claims description 3
238000010438 heat treatment Methods 0.000 abstract description 30
238000001816 cooling Methods 0.000 abstract description 15
230000007704 transition Effects 0.000 abstract description 10
238000004519 manufacturing process Methods 0.000 abstract description 5
XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 abstract description 3
229910052769 Ytterbium Inorganic materials 0.000 abstract description 2
IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Inorganic materials [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 abstract 1
QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 36
AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 32
239000010949 copper Substances 0.000 description 27
239000012071 phase Substances 0.000 description 22
239000005751 Copper oxide Substances 0.000 description 16
229910000431 copper oxide Inorganic materials 0.000 description 16
239000008188 pellet Substances 0.000 description 14
RUDFQVOCFDJEEF-UHFFFAOYSA-N oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 13
238000002360 preparation method Methods 0.000 description 11
238000002441 X-ray diffraction Methods 0.000 description 10
239000000047 product Substances 0.000 description 10
239000013078 crystal Substances 0.000 description 8
230000000694 effects Effects 0.000 description 8
PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
229910052788 barium Inorganic materials 0.000 description 7
150000001875 compounds Chemical class 0.000 description 7
MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 6
150000002823 nitrates Chemical class 0.000 description 6
BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
238000003746 solid phase reaction Methods 0.000 description 6
QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 5
239000012535 impurity Substances 0.000 description 5
229910052746 lanthanum Inorganic materials 0.000 description 5
239000004570 mortar (masonry) Substances 0.000 description 5
229910017604 nitric acid Inorganic materials 0.000 description 5
RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
229910052802 copper Inorganic materials 0.000 description 4
238000010348 incorporation Methods 0.000 description 4
VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
239000007787 solid Substances 0.000 description 4
229910002651 NO3 Inorganic materials 0.000 description 3
NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
238000006243 chemical reaction Methods 0.000 description 3
230000006835 compression Effects 0.000 description 3
238000007906 compression Methods 0.000 description 3
FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 3
239000007788 liquid Substances 0.000 description 3
229910052697 platinum Inorganic materials 0.000 description 3
239000002994 raw material Substances 0.000 description 3
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
238000000137 annealing Methods 0.000 description 2
239000003795 chemical substances by application Substances 0.000 description 2
239000002131 composite material Substances 0.000 description 2
239000000356 contaminant Substances 0.000 description 2
RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 2
238000001035 drying Methods 0.000 description 2
238000000227 grinding Methods 0.000 description 2
MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 2
235000006408 oxalic acid Nutrition 0.000 description 2
238000011160 research Methods 0.000 description 2
238000005245 sintering Methods 0.000 description 2
230000002269 spontaneous effect Effects 0.000 description 2
238000005507 spraying Methods 0.000 description 2
238000012360 testing method Methods 0.000 description 2
238000012546 transfer Methods 0.000 description 2
238000011282 treatment Methods 0.000 description 2
206010021143 Hypoxia Diseases 0.000 description 1
HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
230000002378 acidificating effect Effects 0.000 description 1
230000009471 action Effects 0.000 description 1
238000000889 atomisation Methods 0.000 description 1
RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
229910001863 barium hydroxide Inorganic materials 0.000 description 1
AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
229910052799 carbon Inorganic materials 0.000 description 1
239000001569 carbon dioxide Substances 0.000 description 1
229910002092 carbon dioxide Inorganic materials 0.000 description 1
229910010293 ceramic material Inorganic materials 0.000 description 1
238000000975 co-precipitation Methods 0.000 description 1
238000000354 decomposition reaction Methods 0.000 description 1
230000002950 deficient Effects 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
230000005292 diamagnetic effect Effects 0.000 description 1
238000009792 diffusion process Methods 0.000 description 1
229910001882 dioxygen Inorganic materials 0.000 description 1
239000003344 environmental pollutant Substances 0.000 description 1
230000007717 exclusion Effects 0.000 description 1
238000001125 extrusion Methods 0.000 description 1
230000004907 flux Effects 0.000 description 1
229940004296 formula 21 Drugs 0.000 description 1
PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
229910052737 gold Inorganic materials 0.000 description 1
239000010931 gold Substances 0.000 description 1
230000002706 hydrostatic effect Effects 0.000 description 1
230000006872 improvement Effects 0.000 description 1
239000004615 ingredient Substances 0.000 description 1
229910052742 iron Inorganic materials 0.000 description 1
230000004807 localization Effects 0.000 description 1
UGBIHFMRUDAMBY-UHFFFAOYSA-N lutetium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Lu+3].[Lu+3] UGBIHFMRUDAMBY-UHFFFAOYSA-N 0.000 description 1
238000005259 measurement Methods 0.000 description 1
229910044991 metal oxide Inorganic materials 0.000 description 1
150000004706 metal oxides Chemical class 0.000 description 1
229910052757 nitrogen Inorganic materials 0.000 description 1
231100000719 pollutant Toxicity 0.000 description 1
239000011148 porous material Substances 0.000 description 1
239000002244 precipitate Substances 0.000 description 1
230000001376 precipitating effect Effects 0.000 description 1
238000001556 precipitation Methods 0.000 description 1
239000010453 quartz Substances 0.000 description 1
229910052761 rare earth metal Inorganic materials 0.000 description 1
229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
150000002910 rare earth metals Chemical class 0.000 description 1
239000011541 reaction mixture Substances 0.000 description 1
238000007670 refining Methods 0.000 description 1
238000003303 reheating Methods 0.000 description 1
150000003839 salts Chemical class 0.000 description 1
238000004062 sedimentation Methods 0.000 description 1
238000000926 separation method Methods 0.000 description 1
239000002002 slurry Substances 0.000 description 1
239000002904 solvent Substances 0.000 description 1
239000007921 spray Substances 0.000 description 1
239000007858 starting material Substances 0.000 description 1
238000003756 stirring Methods 0.000 description 1
CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
229910000018 strontium carbonate Inorganic materials 0.000 description 1
239000002887 superconductor Substances 0.000 description 1
238000004154 testing of material Methods 0.000 description 1
229910052723 transition metal Inorganic materials 0.000 description 1
150000003624 transition metals Chemical class 0.000 description 1
VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1

Classifications

- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/80—Constructional details
- H10N60/85—Superconducting active materials
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
- C04B35/4504—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing rare earth oxides
- C04B35/4508—Type 1-2-3
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G3/00—Compounds of copper
- C01G3/006—Compounds containing copper, with or without oxygen or hydrogen, and containing two or more other elements
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0268—Manufacture or treatment of devices comprising copper oxide
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/76—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by a space-group or by other symmetry indications

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Organic Chemistry (AREA)
Manufacturing & Machinery (AREA)
Ceramic Engineering (AREA)
Inorganic Chemistry (AREA)
Materials Engineering (AREA)
Structural Engineering (AREA)
Inorganic Compounds Of Heavy Metals (AREA)
Compositions Of Oxide Ceramics (AREA)
Superconductors And Manufacturing Methods Therefor (AREA)

HU884759A 1987-06-09 1988-06-08 Method for making super-conducting substance with critical temperature of 90 kelvin grades HUT52646A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US5984787A	1987-06-09	1987-06-09

Publications (1)

Publication Number	Publication Date
HUT52646A true HUT52646A (en)	1990-07-28

Family

ID=22025666

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
HU884759A HUT52646A (en)	1987-06-09	1988-06-08	Method for making super-conducting substance with critical temperature of 90 kelvin grades

Country Status (6)

Country	Link
EP (1)	EP0366721A4 (de)
JP (1)	JPH02503789A (de)
KR (1)	KR890702262A (de)
AU (1)	AU608886B2 (de)
HU (1)	HUT52646A (de)
WO (1)	WO1988010515A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4898851A (en) *	1987-06-22	1990-02-06	E. I. Du Pont De Nemours And Company	Process for making 90 k superconductors using a spray dried oxalate precursor
US4861753A (en) *	1987-06-22	1989-08-29	E. I. Du Pont De Nemours And Company	Process for making superconductors using barium nitrate
US5149682A (en) *	1987-09-11	1992-09-22	W. R. Grace & Co. -Conn.	Manufacturing method for superconducting ceramics and products thereof
BR8804615A (pt) *	1987-09-11	1989-04-18	Grace W R & Co	Processo de producao de um solido ceramico supercondutor constituido por oxidos metalicos;composicao oxido metalica; e particulas esferoidais
US5006504A (en) *	1989-08-28	1991-04-09	At&T Bell Laboratories	Preparing superconducting ceramic materials
IT1248618B (it) *	1990-08-01	1995-01-21	Sviluppo Materiali Spa	Dispositivo per la produzione in continuo di ceramiche superconduttrici

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3330697A (en) *	1963-08-26	1967-07-11	Sprague Electric Co	Method of preparing lead and alkaline earth titanates and niobates and coating method using the same to form a capacitor
US4636378A (en) *	1985-06-11	1987-01-13	Hughes Aircraft Company	Method of preparation of perovskite-type compounds
US4661282A (en) *	1985-06-24	1987-04-28	The Dow Chemical Company	Inorganic anion exchangers and preparation thereof
EP0275343A1 (de) *	1987-01-23	1988-07-27	International Business Machines Corporation	Supraleitender Verbund des Strukturtypes von K2NiF4 mit hoher Übergangstemperatur und Verfahren zu seiner Herstellung
NL8701787A (nl) *	1987-07-29	1989-02-16	Philips Nv	Werkwijze voor het vervaardigen van oxidisch supergeleidend materiaal.
BR8804615A (pt) *	1987-09-11	1989-04-18	Grace W R & Co	Processo de producao de um solido ceramico supercondutor constituido por oxidos metalicos;composicao oxido metalica; e particulas esferoidais

1988
- 1988-06-08 HU HU884759A patent/HUT52646A/hu unknown
- 1988-06-08 JP JP63506397A patent/JPH02503789A/ja active Pending
- 1988-06-08 EP EP19880906653 patent/EP0366721A4/en not_active Withdrawn
- 1988-06-08 AU AU21299/88A patent/AU608886B2/en not_active Ceased
- 1988-06-08 WO PCT/US1988/002025 patent/WO1988010515A1/en not_active Ceased
- 1988-06-08 KR KR1019890700228A patent/KR890702262A/ko not_active Withdrawn

Also Published As

Publication number	Publication date
AU608886B2 (en)	1991-04-18
WO1988010515A1 (en)	1988-12-29
EP0366721A4 (en)	1991-04-24
EP0366721A1 (de)	1990-05-09
AU2129988A (en)	1989-01-19
KR890702262A (ko)	1989-12-23
JPH02503789A (ja)	1990-11-08

Legal Events

Date	Code	Title	Description
1992-04-28	DFA9	Temporary protection cancelled due to abandonment

Publication	Publication Date	Title
US4898851A (en)	1990-02-06	Process for making 90 k superconductors using a spray dried oxalate precursor
CN1028390C (zh)	1995-05-10	改进的制造90k超导体的方法
US4861753A (en)	1989-08-29	Process for making superconductors using barium nitrate
Song et al.	1990	Rapid Formation of the 110 K Phase in BI‐Pb‐Sr‐Ca‐Cu‐O through Freeze‐Drying Powder Processing
HUT52646A (en)	1990-07-28	Method for making super-conducting substance with critical temperature of 90 kelvin grades
EP0354537B1 (de)	1993-01-07	Verfahren zur Herstellung eines Pulvers aus supraleitfähigem Oxid auf der Basis von Wismut, das Blei enthält, und Verfahren zur Herstellung eines Sinterkörpers daraus
EP0452423B1 (de)	1993-12-29	Verfahren zur herstellung eines gleichförmig gemischten metalloxyds
US4996189A (en)	1991-02-26	Method of producing mixed metal oxide material, and of producing a body comprising the material
US5036043A (en)	1991-07-30	Process for making 90 K superconductors
US5079217A (en)	1992-01-07	Process for preparing homogenous superconductors by heating in a nitrogen dioxide containing atmosphere
Shrivastava	2018	Synthesis of high-TC superconducting cuprate materials through solid state reaction route
McHale et al.	1995	Simplified preparation of REBa2Cu3O7− x via the acetate method
US4977109A (en)	1990-12-11	Process for the preparation of the precursor used in the fabrication of Y--B--CU--O superconductors using a solgel technique
EP0357683A1 (de)	1990-03-14	Verfahren zur herstellung von 90k-supraleitern
US5304536A (en)	1994-04-19	Process for making superconductor powder
US5457088A (en)	1995-10-10	Process for the preparation of a semiconductor from an oxalate
AU634185B2 (en)	1993-02-18	Homogeneous high temperature superconductors and process for making them
RU1794057C (ru)	1993-02-07	Способ получени сверхпровод щего соединени
JP2748942B2 (ja)	1998-05-13	酸化物超電導体
CA2027898A1 (en)	1991-04-20	Superconductor and process for its preparation
JPH01305812A (ja)	1989-12-11	Ｙ−Ｂａ−Ｃｕ−Ｏ系超伝導体粉末の製造方法
JPH03174320A (ja)	1991-07-29	銅を含む酸化物セラミックスの超電導材を調製する方法
HK1001070B (en)	1998-05-22	Process for preparing homogeneous high temperature superconductors