Valence determination in high T/sub c/ oxide superconductors by XANES (X-ray Absorption Near Edge Structure) and Moessbauer spectroscopy. [La/sub 2-x/(Sr,Eu)/sub x/CuO/sub 4/; (Y,Gd,Pr)Ba/sub 2/Cu/sub 3/O/sub 7-delta/]
Conference
·
OSTI ID:5848506
The question of valence of Cu and rare-earth atoms in the newly discovered oxide superconductors with high transition temperatures is crucial to the understanding of their electronic structure. X-Ray Absorption Near Edge Structure and Moessbauer Spectroscopy were used to measure the valence of Cu, Pr, Eu, and Gd in La/sub 2-x/(Sr,Eu)/sub x/CuO/sub 4/ and (Y,Gd,Pr)Ba/sub 2/Cu/sub 3/O/sub 7-delta/. Results are presented, and the Cu valence as a function of oxygen concentration is discussed. 18 refs., 6 figs.
- Research Organization:
- Argonne National Lab., IL (USA); City Univ. of New York, NY (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5848506
- Report Number(s):
- CONF-870843-3; ON: DE88003100
- Resource Relation:
- Conference: International conference on electronic structure in phase stability in advanced ceramics, Argonne, IL, USA, 17 Aug 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Mon Mar 01 00:00:00 EST 1993
·
OSTI ID:5848506
Synthesis and magnetic properties of novel Ln{sub 2-x}M{sub x}CuO{sub 4+y} compositions (Ln = La, Pr, Nd, Sm, Eu, Gd; M = Ca, Sr, Ba; 0 {le} x {le} 0.2; {minus}0.5 {le} y {le} 0.5)
Thesis/Dissertation
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Mon Mar 01 00:00:00 EST 1993
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OSTI ID:5848506
X-ray-absorption studies of cation ordering and valence in the T sup * -phase La sub 2 minus x minus y R x Sr sub y CuO sub 4 ( R =Sm, Eu, Gd, Tb, and Dy) (US)
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·
Tue Oct 01 00:00:00 EDT 1991
· Physical Review, B: Condensed Matter; (United States)
·
OSTI ID:5848506
+5 more
Related Subjects
36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
ELECTRONIC STRUCTURE
VALENCE
COPPER OXIDES
EUROPIUM OXIDES
GADOLINIUM OXIDES
LANTHANUM OXIDES
PRASEODYMIUM OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
CRYSTAL STRUCTURE
ENERGY-LEVEL TRANSITIONS
MAGNETIC PROPERTIES
MOESSBAUER EFFECT
PHASE TRANSFORMATIONS
SUPERCONDUCTORS
TRANSITION TEMPERATURE
X-RAY SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
EUROPIUM COMPOUNDS
GADOLINIUM COMPOUNDS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SPECTRA
STRONTIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
ELECTRONIC STRUCTURE
VALENCE
COPPER OXIDES
EUROPIUM OXIDES
GADOLINIUM OXIDES
LANTHANUM OXIDES
PRASEODYMIUM OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
CRYSTAL STRUCTURE
ENERGY-LEVEL TRANSITIONS
MAGNETIC PROPERTIES
MOESSBAUER EFFECT
PHASE TRANSFORMATIONS
SUPERCONDUCTORS
TRANSITION TEMPERATURE
X-RAY SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
EUROPIUM COMPOUNDS
GADOLINIUM COMPOUNDS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SPECTRA
STRONTIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)