Residual-stress measurement of YBCO sol-gel films on polycrystalline MgO
YBa{sub 2}Cu{sub 3}O{sub x} thick films were fabricated on 10-cm-diameter polycrystalline MgO wafers by spray pyrolysis of a sol-gel solution made from metal acetates gelled in monoethanolamine. The film thickness was built up in layers of approximately 1-{mu}m thick. In-plane residual stresses were measured of each layer by a shadow moire technique. The films were characterized by electrical property measurements, optical and electron microscopy, and X-ray. The critical temperature onset ({Tc}) was from 78 to 92K, and {Tc} zero was from 15 to 65K depending on film thickness. The best critical current density is 3,100 (A/cm{sup 2}) for a small sample and 1,883 (A/cm{sup 2}) for a large wafer. The highest crack density was obtained at the center of the large wafer and corresponded to a lower J{sub c} values vary with film thickness and position on the wafer. The highest crack density was obtained at the center of the large wafer and corresponded to a lower J{sub c} region. A cation diffusion study showed that the significant Cu diffusion occurs into the MgO substrate. X-ray analysis of the films showed that the amount of the impurity phase Y{sub 2}BaCuO{sub 5} (211) varies with film thickness; as the film gets thicker, the amount of 211 was decreased.
- Research Organization:
- Illinois Univ., Chicago, IL (United States)
- OSTI ID:
- 7038971
- Country of Publication:
- United States
- Language:
- English
Similar Records
The variability residual stresses of thick superconductor films during orthorhombic to tetragonal transformation
Superconductivity devices: Commercial use of space. Annual Report, 3 Jul. 1991 - 2 Jul. 1992
Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
FABRICATION
FILMS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RESIDUAL STRESSES
STRESSES
SUBSTRATES
SUPERCONDUCTING FILMS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES