The temperature behavior of Fe-substituted YBa/sub 2/Cu/sub 3/O/sub 7-y/ superconducting system

Journal Article · Mon Apr 10 04:00:00 EDT 1989 · Mod. Phys. Letters B; (United States)

DOI:https://doi.org/10.1142/S0217984989000662· OSTI ID:5854662

Wang, H Q; Shao, H M; Hsia, Y F; Liu, R C; Jin, X; Zhu, S N

After the discovery of superconductivity in the YBa/sub 2/Cu/sub 3/O/sub 7-y/ system, a large amount of researches have been related to the investigation of the phase structure. High-T/sub c/ YBa/sub 2/Cu/sub 3/O/sub 7-y/ superconductor at room temperature is orthorhombic with Pmmm space group. Various authors have reported that the lattice parameters of these superconductors can vary with the content of oxygen. The XRD and the electromicroscopic experiments showed that the oxygen along b axis appeared as an ordered arrangement, in which one dimensional Cu-O chain form might be a necessary condition for superconducting system. Recently it has been reported that in Fe-substituted YBa/sub 2/Cu/sub 3/O/sub 7-y/ system, Fe occupied the Cu sites and induced a structural transformation from orthorhombic to tetragonal at room temperature, T/sub c/ was almost unaffected by the substitution of up to 4%. It implies that the superconductivity in copper oxides does not depend on the orthorhombic crystal symmetry. The authors reported the thermogravimetric experiment to determine oxygen content in Fe-substituted YBa/sub 2/Cu/sub 3/O/sub 7-y/. It indicated that T/sub c/ of (YBa/sub 2/Cu/sub 1-x/Fe/sub x/)/sub 3/O/sub 7-y/ superconductors (chi /le/ 7%) is not very sensitive to their oxygen content although the phase structure has obviously changed. Fe-substitution influenced the orthorhombicity. The phase structure is tetragonal below 180/sup 0/C and transforms to orthorhombic at higher temperatures when chi /le/ 4%. The present work was done to investigate the temperature behavior of Fe-substituted YBa/sub 2/Cu/sub 3/O/sub 7-y/ superconductors.

• Research Organization: Nanjing Univ., JS (China); Nanjing Univ., JS (China)
• OSTI ID: 5854662
• Journal Information: Mod. Phys. Letters B; (United States), Journal Name: Mod. Phys. Letters B; (United States) Vol. 3:5; ISSN MPLBE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
GRAVIMETRIC ANALYSIS
HIGH TEMPERATURE
INFORMATION
IRON
METALS
MICROSCOPY
NONMETALS
NUMERICAL DATA
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TETRAGONAL LATTICES
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES