Study of Electrical Properties of Cobalt Oxide-Doped Amorphous Manganese Dioxide at Different Frequencies
Abstract
Samples were prepared within the binary system MnO2-Co3O4 at different molar percentages depending on the ceramic method using amorphous manganese dioxide MnO2, and crystalline cobalt oxide Co3O4, according to (x)MnO2 -(100-x)Co3O4, for the molar percentages (x= 5, 10, 25, 40, 60, 75, 80) mole%. Then they were prepared in tablets form using a manual hydraulic press. The heating process was carried out under a specific heat program, and the samples were heated at 150°C for 8 hours. The grinding and pressing operations were repeated by the same mechanism, with an increase in temperature of 25°C each time until reaching 550oC. After that the samples were sintered at 550oC for 15 hours. The electrical properties of the prepared samples were studied using LCR meter device, such as the specific electrical resistivity ρ, electrical capacitance C, the relative dielectric constant Ԑr, and the loss tangent tanδ within the frequency range (5Hz -1MHz). The results showed that the resistivity values of all prepared samples increased, and the higher value is 2.44×10+06 (Ω.cm), in addition to the increase in the values of electrical capacitance, where the highest value is 74.5 pF, and the highest value of the relative dielectric constant is 198.79, and the highest value of the loss tangent is 2.56×10-1, with the change in the molar percentage of amorphous manganese dioxide.
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