Preparation and electrical properties of LaCr/sub 1-//sub x/Cu/sub x/O/sub 3/
The perovskite-type ceramic LaCr/sub 1-//sub x/Cu/sub x/O/sub 3/ was prepared by the solid-state reaction or the coprecipitation method in the range of 0less than or equal toxless than or equal to0.5. X-ray diffraction, and electrical and some optical measurements were performed to examine the crystal structure and other physical properties. In this range, all samples show p-type semiconducting properties, and the transport mechanism is attributed to a hopping of a small polaron. The conductivity increases and the activation energy decreases as the concentration of Cu increases. At low temperatures, electrical properties show a variable range hopping caused by the Anderson localization mechanism. According to the activation energy dependence of the Cu concentration, we suggest that the virtual insulator-metal transition occurs at the critical concentration x/sub c/ = 0.77.
- Research Organization:
- Department of Physics, School of Science, Kwansei Gakuin University, Nishinomiya 662, Japan
- OSTI ID:
- 6979197
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 64:6; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
CERAMICS
CHALCOGENIDES
CHARGED-PARTICLE TRANSPORT
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
FABRICATION
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NUMERICAL DATA
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
RADIATION TRANSPORT
RARE EARTH COMPOUNDS
SCATTERING
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION