Fabrication and Property Control of LaCro3 Based Oxides
In recent years the search for materials which can be used as electrical conductors at elevated temperatures in corrosive environment has lead us to investigate many of the high melting point oxides. Unfortunately most of these oxides have quite wide band gaps and therefore possess little electrical conductivity. This is particularly true for those oxides whose bonding orbitals involve only s & p electrons (e. g., MgO, A12O3). However oxides whose cations have d-electron states available do show rather high electrical conductivity (e. g., NiO, CoO), In these oxides, conductivity can be attributed to electrons or holes moving through the d-electron energy levels of the cation either by a localized hopping process or by a narrow conduction band mechanism.1 2 Therefore most of the compounds under consideration contain transition metal cations.
KeywordsElectrical Resistivity Oxygen Activity Solid Oxide Fuel Cell Property Control Transition Metal Cation
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