Defect chemistry of La[sub 2-x]Sr[sub x]CuO[sub 4-x/2](O < x [le] 1)
Journal Article
·
· Journal of Solid State Chemistry; (United States)
- Lehigh Univ., Bethlehem, PA (United States)
The hole concentration in oxygen-equilibrated La[sub 2-x]Sr[sub x]CuO[sub 4-x/2] increases linearly with x up to x [approx] 0.15, passes through a maximum value, and then decreases for further increases in x. This change in behavior is attributed to a shift in the charge-compensating defect from holes to oxygen vacancies. However, classical defect chemistry indicates that the hole concentration should only shift to a less rapid rate of increase with x, but not decrease. The observed decrease is caused by an increase in the enthalpy of the oxidation reaction that fills vacancies and replaces them with holes. This occurs because large concentrations of oxygen vacancies are effective in relieving imbalances in stress and charge that exist in the intergrowth structure of La[sub 2]CuO[sub 4]. As a result, the vacancies become increasingly favored over holes as the charge compensating defect in the highly acceptor-doped material. The increase in the enthalpy of oxidation results in maximum values for both the hole concentration and [Tc] as functions of the acceptor content.
- OSTI ID:
- 7079125
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 102:1; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENTHALPY
HOLES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENTHALPY
HOLES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS