A Schematic illustration of the experimental set-up for the electrochemical anodization of Al substrate to form a porous alumina layer. a) The structure of the sample holder. b) The sample geometry inside the preparation vessel.
The dielectric measurements are performed with the LCR Hioki impedance analyzer. It enables measurements of dielectric capacitance, conductance and impedance at frequencies between 100Hz and 4MHz under applied electric voltage up to 30V. The measurements can be done at room temperature or during heating at temperatures up to 1200C. The measurement system is computerized and operated by a labview program.