Defect chemistry of undoped La sub 2 CuO sub 4

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1016/0022-4596(92)90052-W· OSTI ID:7227148

Hong, D J.L.; Smyth, D M ^[1]

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1. Lehigh Univ., Bethlehem, PA (United States)

La{sub 2}CuO{sub 4} is an oxygen-excess, p-type material over the range 700-900C and 10{sup {minus}2}-10{sup 5} Pa of oxygen. The major defects are interstitial oxygen and holes. The enthalpy of oxidation is near zero, and the hole mobility increases slightly with decreasing temperature, characteristic of band conduction. The preference for oxygen-excess nonstoichiometry is attributed to the presence of an interstitial site that is of adequate size for an oxide ion, to local charge and stress imbalances in the La{sub 2}CuO{sub 4} lattice that favor the presence of holes in the Cu-O planes, and to large, negatively charged oxygen interstitials in the NaCl layers of the intergrowth structure.

• OSTI ID: 7227148
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 97:2; ISSN JSSCB; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ANIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
DATA
DEFECTS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENTHALPY
EXPERIMENTAL DATA
HOLES
INFORMATION
IONS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
RARE EARTH COMPOUNDS
SEEBECK EFFECT
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS