Oxide ion conductivity in doped NdAlO[sub 3] perovskite-type oxides
- Oita Univ. (Japan). Dept. of Applied Chemistry
Oxide ion conductivity in doped NdAlO[sub 3] Perovskite-type oxides was investigated. Among the alkaline earth cations the addition of Ca for Nd site is effective for increasing the oxide ion conductivity of NdAlO[sub 3]. Oxide ion conductivity increased anomalously with increases in the amount of Ca, and attained the maximum at x = 0.1 in Nd[sub 1[minus]x]Ca[sub x]AlO[sub 3], since the limit of the solid solution of Ca into the Nd site seems to be around x = 0.1. The addition of the cations for the Al site of Nd[sub 0.9]Ca[sub 0.1]AlO[sub 3] was also effective for increasing the oxide ion conductivity, and it was found that the substitution of Ga on Al sites is effective for enhancing the oxide ion conductivity of Nd[sub 0.9]Ca[sub 0.1]AlO[sub 3]. The oxide ion conductivity increased with increasing the Ga content and the highest oxide ion conductivity was attained at x = 0.5 in Nd[sub 0.9]Ca[sub 0.1]Al[sub 1[minus]x]Ga[sub x]O[sub 3]. Since the increased oxygen ion conductivity by doping Ga suppressed the p-type semiconduction in high oxygen partial pressure range, electrical conductivity was almost independent of the oxygen partial pressure. The theoretical electromotive forces were obtained from the galvanic cell measurement where Nd[sub 0.9]Ca[sub 0.1]Al[sub 0.5]Ga[sub 0.5]O[sub 3] was used as the electrolyte. Furthermore, the fuel cell where Nd[sub 0.9]Ca[sub 0.1]Al[sub 0.5]Ga[sub 0.5]O[sub 3], Ni, and La[sub 0.6]Sr[sub 0.4]MnO[sub 3] were used as electrolyte, anode, and cathode, respectively, exhibited the short-circuit current density higher than 400 mA/cm[sup 2] at 1273 K, when humidified H[sub 2] and O[sub 2] were used as fuels and oxidizing agent, respectively. These results suggest that the perovskite-type oxide, Nd[sub 0.9]Ca[sub 0.1]Al[sub 0.5]Ga[sub 0.5]O[sub 3], exhibits almost a pure oxide ion conductivity with high electrical conductivity over a wide range of oxygen partial pressures and temperatures.
- OSTI ID:
- 6587890
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:12; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
300503 -- Fuel Cells-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCIUM
CHALCOGENIDES
DATA
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTROLYTES
ELEMENTS
EXPERIMENTAL DATA
FUEL CELLS
GALLIUM
HYDROGEN FUEL CELLS
INFORMATION
IONIC CONDUCTIVITY
MATERIALS
METALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SOLID ELECTROLYTE FUEL CELLS
SOLID ELECTROLYTES