Chemistry and high Tc superconductivity in the La-Ba-Cu-O system. Technical report No. 32, 1 July 1987-15 July 1988
Technical Report
·
OSTI ID:6663050
A systematic investigation of the chemistry and superconductivity in the La-Ba-Cu-O system was carried out, using x-ray powder diffraction, resistivity and TGA measurements. A phase diagram for the La-Ba-Cu-O quasi-ternary system at 950 C was determined, and the relationship between the phases in this system is discussed. A series of A-cation (ABO/sub 3/-type perovskite) deficient compounds of the type of (LaBa/sub 2/)xCu/sub 3/O/sub 7.0/ (0.67 < x < 0.96) were prepared. Cation deficiencies appear to stabilize the structure but depress Tc. Partial substitution of La and Ba in LaBa/sub 2/CuO(7+delta) by other rare earth and alkali earth cations, respectively, were also investigated. An enhancement in Tc, compared with La1+xBa/sub 2/-xCu/sub 3/O(7+delta) was found in LaBa/sub 2/-xCaxCu/sub 3/O(7+delta) (0 < x , 1.0), providing further evidence for the importance of reduced lattice dimensions in stabilizing the superconducting phase of La-123.
- Research Organization:
- Rutgers--the State Univ., New Brunswick, NJ (USA). Dept. of Chemistry
- OSTI ID:
- 6663050
- Report Number(s):
- AD-A-197175/3/XAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Orthorhombic-to-tetragonal transition in RA(1+x)Ba(2-x)Cu/sub 3/O(7+ delta) (Re=Nd, Sm, and Eu). Technical report No. 30, 1 July 1987-15 July 1988
Comparative study of superconducting LaBa/sub 2/Cu/sub 3/O/sub 7-delta/ and La/sub 3-x/Ba/sub 3+x/Cu/sub 6/O/sup 14+delta/*
Metallic and non-superconducting phases in LnBa{sub 2}Cu{sub 3-x}Ni{sub x}O{sub 7+{sigma}} oxides
Technical Report
·
Fri Jul 15 00:00:00 EDT 1988
·
OSTI ID:6885987
Comparative study of superconducting LaBa/sub 2/Cu/sub 3/O/sub 7-delta/ and La/sub 3-x/Ba/sub 3+x/Cu/sub 6/O/sup 14+delta/*
Journal Article
·
Thu Mar 31 23:00:00 EST 1988
· J. Solid State Chem.; (United States)
·
OSTI ID:7007100
Metallic and non-superconducting phases in LnBa{sub 2}Cu{sub 3-x}Ni{sub x}O{sub 7+{sigma}} oxides
Journal Article
·
Sat Oct 01 00:00:00 EDT 1994
· Journal of Solid State Chemistry
·
OSTI ID:508690
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMISTRY
COPPER COMPOUNDS
CUPRATES
DIAGRAMS
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IONS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
POWDERS
PROGRESS REPORT
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMISTRY
COPPER COMPOUNDS
CUPRATES
DIAGRAMS
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IONS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
POWDERS
PROGRESS REPORT
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS