Current Efficiency, Dielectric Measurements & Ion Mobility Studies of Anodic Oxide Films Formed on Tantalum in Aqueous Electrolytes

198-20

Conduction studies on tantalum-tantalum oxide-metal system

1042-1045Conduction data on tantalum-tantalum oxide-vacuum evaporated metal systems have been obtained. Current voltage plots show that at lower voltages charge transfer is through ohmic conduction: At higher voltages the slope of log I-log V plots are close to 3 indicating that the space charge limited conduction (SCLC) mechanism is operative. Similar gradual transitions from ohmic conductivity to SCLC are indicated irrespective of the nature of the metal, polarity of the electrode and the thickness of the oxide film. The gap-state density N(E) at the Fermi level, calculated by two different methods, are in close agreement for different metals, oxide thicknesses and polarity of the electrodes

Breakdown voltage and electronic current studies of aluminium-aluminium oxide-electrolyte systems

1199-1204Breakdown voltages and electronic current data (at constant voltage) of anodic aluminium oxide films in contact with different aqueous electrolytes of varying concentrations and compositions have been obtained at 298K. Both breakdown voltage and electronic current depend on electrolyte concentration, resistivity and composition. A linear relation between breakdown voltage and logarithm of electronic current has been observed. The effect of electrolyte concentration, composition and resistivity on breakdown voltage has been discussed in terms of Ikonopisov electron injecting avalanche model of electrical breakdown [Electrochim Acta, 22 (1977) 1077]. The major factor contributing to the decrease in breakdown voltage with increasing electrolyte concentration is the increasing primary electronic current. Breakdown voltage decreases with increase in temperature. Addition of ferrous ions to the electrolyte decreases the breakdown voltage, the effect being pronounced at higher concentrations

Kinetics of Growth of Anodic Oxide Film on Tantalum in Aqueous Citric Acid

819-82

Ionic Conduction in Anodic Oxide Films on Tantalum in Aqueous Electrolytes

1080-108

Formation of Anodic Oxide Films on Tantalum in Presence of Ultraviolet Radiations &Heat Treatment of Anodic Tantalum Oxide Films

569-57

Galvanostatic Breakdown Voltages of Anodic Oxide Films Formed on Tantalum in Aqueous Electrolytes

17-2