Title:
PRODUCTION OF OXIDE HIGH-TEMPERATURE SUPERCONDUCTOR
Document Type and Number:
Japanese Patent JP2550253
Kind Code:
B2
Abstract:
PURPOSE: To obtain an oxide high-temperature superconductor of a large size by effecting the crystal growth of a specific half-molten precursor comprising oxides containing Ba and Cu elements to control the nucleus formation, crystal direction and the growth rate.
CONSTITUTION: In an oxide mixture containing Ba and Cu elements where Ba content is 25 to 75mole% (based on the metallic elements), 5 to 50vol.% of RE2O3 (one rare earth element containing Y or a combination of rare earth elements) is dispersed to prepare a precursor. The precursor is once heated at 950 to 1,350°C in an oxidative atmosphere into a half-molten state, then cooled down to 900 to 1,100°C. Then, the precursor is brought into contact with a single crystal as seed crystal of the RE compositional formula having a higher formation temperature than that of the RE composition shown in formula among precursors. Subsequently, the superconductor phase having an arbitrary crystal direction equal to the seed crystal is gradually cooled down in a range of 800 to 1060°C or maintained at a constant temperature between 800 and 1060°C to perform continuous growth of the phase represented by the formula.
Inventors:
MORITA MITSURU
KIMURA KEIICHI
MYAMOTO KATSUYOSHI
SAWANO KYOSHI
KIMURA KEIICHI
MYAMOTO KATSUYOSHI
SAWANO KYOSHI
Application Number:
JP5520392A
Publication Date:
November 06, 1996
Filing Date:
March 13, 1992
Export Citation:
Assignee:
SHINNIPPON SEITETSU KK
International Classes:
C01G1/00; C01G3/00; C30B9/06; C30B11/14; C30B13/34; C30B17/00; C30B29/22; H01B12/00; H01L39/24; (IPC1-7): C30B29/22; C01G1/00; C01G3/00; C30B11/14; C30B13/34; C30B17/00; H01B12/00; H01L39/24
Domestic Patent References:
| JP2208286A |
Attorney, Agent or Firm:
Tomoyuki Yathata (1 outside)