Impedance spectra of field-aligned CrO2 needle-shape powders

Abstract The frequency behaviour of the electrical properties of field-aligned CrO 2 needle-shape powders has been investigated by the impedance spectroscopy method. The low frequencies R ( f ) increase with increasing θ , the angles between the applied current direction and the easy axis of the aligned samples. The specific frequency, of which a maximum − X ( f ) occurred, is varied towards the lower ones as θ increased. Analysis, based on classical electromagnetism as well as equivalent circuit method, has been performed to disclose the mechanism underlying for AC conductivity.