Presence of inductivity in (CoFeZr)x(PZT)1-x nanocomposite produced by ion beam sputtering

Abstract

This paper presents the investigations of the electrical properties of the (CoFeZr)x(PZT)1􀀀x nanocomposite with the metallic phase content x = 43:8 at.%, which was produced by ion beam sputtering. Such preparation took place under an argon atmosphere with low oxygen content with its partial pressure PO2 = 2 mPa. The measurements were performed using alternating current within the frequency range of 50 Hz – 0.1 MHz for measuring temperatures ranging from 238 K to 328 K. The (CoFeZr)43:8(PZT)56:2 nanocomposite sample subjected to a 15 min annealing process in air at the temperature Ta = 423 K demonstrates a phase angle of 􀀀90 in the frequency range 50 Hz – 0.1 MHz. It corresponds to the capacitive type of conduction. In the frequency range 10 – 100 kHz sharp minima in selected conductivity vs. frequency characteristics occur, which corresponds to a current resonance phenomenon in RLC circuits. In case of a sample annealed at Ta = 498 K the inductive type of conduction with +90 occurs in a high frequency area. At the frequency fr characterized by the phase angle = 0 , the capacity value reaches its local minimum. It indicates a voltage resonance phenomenon in conventional RLC circuits. The +90 crossing in the frequency dependence of phase angle corresponds to the current resonance phenomenon, which is represented by a strong local minimum in the conductivity vs. frequency characteristics.