Synthesis, structural characterization, and electronic properties of the LaNi{sub 1-x}W{sub x}O{sub 3} (O {le} {times} {le} 0.25) perovskite-like system
- Universidad Complutense, Madrid (Spain)
The structural characterization and electronic properties for the LaNi{sub 1-x}W{sub x}O{sub 3} perovskite-like system are reported. Neutron and X-ray powder diffraction data suggest that for the x > 0 phases, an orthorhombic symmetry (space group Pbnm) is adopted showing that Ni and W atoms are placed at random. The evolution of the cell-parameters is in agreement with the different size of the concerned cations in each case. The electronic measurements between 5 and 950 K show a temperature dependence of conductivity very sensitive to the composition. For the 0 {le} {times} {le} 0.20 compounds, a conductivity variation very close to metallic behavior is observed whereas the mixed oxide with x = 0.25 behaves as a semiconductor. Both conductivity data and Seebeck coefficient measurements are interpreted on the basis of a correlated system in which a metal to insulator transition takes place as a function of temperature and composition. An schematic band model consistent with both the electronic properties and structural features is proposed.
- OSTI ID:
- 450702
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 125; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
40 CHEMISTRY
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
LANTHANUM OXIDES
NEUTRON DIFFRACTION
NICKEL OXIDES
ORTHORHOMBIC LATTICES
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TUNGSTEN OXIDES
X-RAY DIFFRACTION