Chemical instability of YBa/sub 2/Cu/sub 3/O/sub 7/minus//delta// at high mechanical pressures
Journal Article
·
· Appl. Phys. Lett.; (United States)
The high-temperature superconducting phase YBa/sub 2/Cu/sub 3/O/sub 7/minus//delta// has been found to be unstable with respect to and decompose into other metal oxides (Y/sub 2/BaCuO/sub 5/, CuO, Cu/sub 2/O, BaCuO/sub 2/, and others) at stresses greater than 100 MPa at temperatures from 700 to 950 /degree/C. Hot isostatic pressing and hot uniaxial pressing were used to apply pressure to and to densify porous YBa/sub 2/Cu/sub 3/O/sub 7/minus//delta//. X-ray diffraction and scanning electron microscopy/x-ray spectroscopy were used to determine phase purity before and after pressing. The instability of the superconducting phase should be considered during the development of hot mechanical densification and shape-forming processes, since a limit exists for the time at temperature and pressure that the YBa/sub 2/Cu/sub 3/O/sub 7/minus//delta// phase can withstand before decomposing.
- Research Organization:
- Center for Strategic Materials, 1137 Mudd, Columbia University, New York, New York 10027-6699 (US); Philips Laboratories, Briarcliff Manor, New York 10590-2027
- OSTI ID:
- 5952944
- Journal Information:
- Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 55:3; ISSN APPLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hot isostatic pressing of YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] and YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]]/Ag composites
Some observations of the effects of high pressures and temperatures on the stability of YBa sub 2 Cu sub 3 O sub 7 minus x
Effect of oxygen loss on densification when hot isostatic pressing YBa/sub 2/Cu/sub 3/O/sub 7-. Delta. /
Journal Article
·
Wed Mar 31 23:00:00 EST 1993
· Journal of the American Ceramic Society; (United States)
·
OSTI ID:6221269
Some observations of the effects of high pressures and temperatures on the stability of YBa sub 2 Cu sub 3 O sub 7 minus x
Journal Article
·
Fri Jun 01 00:00:00 EDT 1990
· Journal of Applied Physics; (USA)
·
OSTI ID:6881896
Effect of oxygen loss on densification when hot isostatic pressing YBa/sub 2/Cu/sub 3/O/sub 7-. Delta. /
Journal Article
·
Tue Aug 01 00:00:00 EDT 1989
· Journal of the American Ceramic Society; (USA)
·
OSTI ID:5301742
Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
DECOMPOSITION
DENSITY
ELECTRON MICROSCOPY
FABRICATION
HOT PRESSING
INSTABILITY
MATERIALS WORKING
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRESSING
PRESSURE EFFECTS
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
STABILITY
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
DECOMPOSITION
DENSITY
ELECTRON MICROSCOPY
FABRICATION
HOT PRESSING
INSTABILITY
MATERIALS WORKING
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRESSING
PRESSURE EFFECTS
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
STABILITY
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES