PAPER ID:IJIM/V.4(IX)/28-32/4

AUTHOR: Dr. Parveen Katyal

TITLE : ION MOBILITY, HEAT TREATMENT OF TANTALUM OXIDE THIN FILMS IN AQUEOUS ELECTROLYTES

ABSTRACT: Ion mobility’s, heat treatment and its effects on variously formed tantalum oxide thin films in different aqueous electrolytes have been evaluated. The capacitance of tantalum oxide thin films depends on concentration and nature of the aqueous electrolyte. It has been observed that only tantalum ions are mobile during the growth of tantalum oxide thin films in various electrolytes. On heat treatment in air the oxide film becomes more conducting. The conductivity depends on the time period and temperature of heat treatment but it is independent of film thickness and nature of the electrolyte. Two different types of patterns of conductivity were observed before and after heating of anodic tantalum oxide thin films. One is associated with high conductance and low rate of change of capacitance with increase in temperature and second is associated with low conductance and high rate of change of capacitance with increase in temperature.

KEYWORDS: Ion mobility, measurements, anodized, conductance.

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