Oxygen content of superconducting perovskites, La/sub 2-x/Sr/sub x/CuO/sub y/ and YBa/sub 2/Cu/sub 3/O/sub y/
Studies of the composition of YBa/sub 2/Cu/sub 3/O/sub y/ in which the oxidation states of Y and Ba are +3 and +2, respectively, have shown a direct relationship between the Cu(II)/Cu(III) ratio and the oxygen stoichiometry. Idometry or hydrogen reduction has generally been used for the Cu(III) determination. A modification of the idometric method that is simple to apply and is particularly suited to analyses of La/sub 2-x/Sr/sub x/CuO/sub y/ and YBa/sub 2/Cu/sub 3/O/sub y/ is described. The results of application to determination of the oxygen content of YBa/sub 2/Cu/sub 3/O/sub y/ are presented, and the oxygen content is related to the crystallographic and superconducting properties of the material. Results indicated that at room-temperature large variations of the oxygen content of the orthorhombic phase of YBa/sub 2/Cu/sub 3/O/sub y/ could occur without change in the lattice parameters or appreciable impairment of the resistive superconducting transition or diamagnetic properties. 13 references, 1 figure, 1 table.
- Research Organization:
- Argonne National Lab., IL
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5798782
- Journal Information:
- Inorg. Chem.; (United States), Vol. 26:20
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM OXIDES
CRYSTAL STRUCTURE
SUPERCONDUCTIVITY
COPPER OXIDES
OXYGEN
IODOMETRY
YTTRIUM OXIDES
EXPERIMENTAL DATA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
INFORMATION
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TITRATION
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
400102 - Chemical & Spectral Procedures