NO890561L - IMPROVED PROCEDURE FOR MANUFACTURING 90 K SUPER conductors. - Google Patents

IMPROVED PROCEDURE FOR MANUFACTURING 90 K SUPER conductors.

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Publication number
NO890561L
NO890561L NO89890561A NO890561A NO890561L NO 890561 L NO890561 L NO 890561L NO 89890561 A NO89890561 A NO 89890561A NO 890561 A NO890561 A NO 890561A NO 890561 L NO890561 L NO 890561L
Authority
NO
Norway
Prior art keywords
approx
precursor powder
manufacturing
oxygen
atomic ratio
Prior art date
Application number
NO89890561A
Other languages
Norwegian (no)
Other versions
NO890561D0 (en
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.)
Filing date
Publication date
Priority claimed from PCT/US1988/002025 external-priority patent/WO1988010515A1/en
Application filed by Du Pont filed Critical Du Pont
Publication of NO890561D0 publication Critical patent/NO890561D0/en
Publication of NO890561L publication Critical patent/NO890561L/en

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  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

bet beskrives en forbedret frem-gangsmåte for fremstilling av et supraledende materiale med formelen MBa2Cu3<>x hvori M er valgt fra gruppen bestående av Y, Nd, Sm, Eu, Gd, Dy, .Ho, Er, Tm, Yb og Lu, x er fra ca. 6,5 til ca. 7,0, idet materialet har en supraledende overgangs-temperatur av ca. 90 K, idet fremgangs-måten i det vesentlige består av oppvar-ming av et forløperpulver i en oxygenholdig atmosfære ved en temperatur fra ca. 875° C til ca. 950° C i en tid tilstrekkelig til å danneBaCuOy, hvori y er fra ca. 6,0 til ca. 6,4, og opprettholdel-se av dette MBa2Cu^Ov i en oxygenholdig atmosfære under avkjøling i en tid som er tilstrekkelig til å oppnå det ønskede produkt, idet det nevnte forløperpulver fremstilles ved (a) blanding av pulvere. av,a(O)8H0 og CuO i et atomforhold H:Ba:Cu av ca. 1:2:3 eller (b) dannelse av en vandig oppløsning av M(N0), Ba(N0)og Cu(N0)i et atomforhold M:Ba:Cu av ca. 1:2:3, til-setning av tilstrekkelig med sitronsyre-monohydrat til den erholdte oppløsning. til å omvandle de tilstedeværende metal-ler til deres tilsvarende sitrater, og sprøytetørking av den erholdte oppløs-ning for å oppnå forløperpulveret.an improved process for the preparation of a superconducting material of the formula MBa2Cu3 <> x is described in which M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, .Ho, Er, Tm, Yb and Lu, x is from approx. 6.5 to approx. 7.0, the material having a superconducting transition temperature of approx. 90 K, the process essentially consisting of heating a precursor powder in an oxygen-containing atmosphere at a temperature of from about 875 ° C to approx. 950 ° C for a time sufficient to form BaCuOy, wherein y is from approx. 6.0 to approx. 6.4, and maintaining this MBa 2 Cu 2 O 3 in an oxygen-containing atmosphere while cooling for a time sufficient to obtain the desired product, said precursor powder being prepared by (a) mixing powders. of, a (O) 8H0 and CuO in an atomic ratio H: Ba: Cu of approx. 1: 2: 3 or (b) formation of an aqueous solution of M (NO), Ba (NO) and Cu (NO) in an atomic ratio M: Ba: Cu of approx. 1: 2: 3, adding sufficient citric acid monohydrate to the resulting solution. to convert the metals present to their corresponding citrates, and spray-drying the resulting solution to obtain the precursor powder.

NO89890561A 1987-06-09 1989-02-09 IMPROVED PROCEDURE FOR MANUFACTURING 90 K SUPER conductors. NO890561L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5984787A 1987-06-09 1987-06-09
PCT/US1988/002025 WO1988010515A1 (en) 1987-06-09 1988-06-08 Improved process for making 90 k superconductors

Publications (2)

Publication Number Publication Date
NO890561D0 NO890561D0 (en) 1989-02-09
NO890561L true NO890561L (en) 1989-04-07

Family

ID=26739263

Family Applications (1)

Application Number Title Priority Date Filing Date
NO89890561A NO890561L (en) 1987-06-09 1989-02-09 IMPROVED PROCEDURE FOR MANUFACTURING 90 K SUPER conductors.

Country Status (2)

Country Link
DK (1) DK620789A (en)
NO (1) NO890561L (en)

Also Published As

Publication number Publication date
DK620789D0 (en) 1989-12-08
NO890561D0 (en) 1989-02-09
DK620789A (en) 1990-01-31

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