Characterization of the redox behavior and stability of conducting oxides
Goal was to study the relation between electrical conductivity, oxidation-reduction kinetics, defect structure, and composition of n- and p-type binary and ternary transition metal oxides. The experimental part included, thermogravimetry, x-ray diffraction, thermally stimulated current, oxygen diffusion, optical absorption, transmission electron microscopy, electrical conductivity, and Seebeck measurements. The oxide systems studied were La-doped SrTiO/sub 3/, Mg-doped LaCrO/sub 3/, Mg-doped LaMnO/sub 3/, Sr-doped LaMnO/sub 3/, and Nb-doped LaCrO/sub 3/. Results show that at low oxygen activity donor doped LaCrO/sub 3/ is n-type but becomes p-type as oxidation occurs; substitution of 50% Mn into LaCrO/sub 3/ enables the compound to be sintered to high density in air at 1500/sup 0/C; LaMnO/sub 3/ tends to decompose as reduction occurs with Mg-doped LaMnO/sub 3/ being more stable than Sr-doped LaMnO/sub 3/; LaMnO/sub 3/ decreases its conductivity at oxygen activities 10/sup 3/ to 10/sup 5/ times higher than for LaCrO/sub 3/; and upon reduction Mg and Sr-doped LaCrO/sub 3/ expands about 0.04% and 0.4% respectively.
- Research Organization:
- Missouri Univ., Rolla (USA)
- DOE Contract Number:
- FG02-85ER45219
- OSTI ID:
- 5906729
- Report Number(s):
- DOE/ER/45219-T1; ON: DE86009871
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHROMATES
CHROMIUM COMPOUNDS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPANSION
FABRICATION
LANTHANUM COMPOUNDS
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MANGANATES
MANGANESE COMPOUNDS
MATERIALS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
OXIDATION
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REDOX REACTIONS
REDUCTION
SEEBECK EFFECT
SINTERING
STRONTIUM ADDITIONS
STRONTIUM ALLOYS
STRONTIUM COMPOUNDS
STRONTIUM TITANATES
THERMAL EXPANSION
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS