Structure and electrophysical properties of a lead iron niobate-based amorphous material

An amorphous material based on lead iron niobate (PFN) is studied by X-ray diffraction and dielectric and Mössbauer measurements over a wide temperature range. The atomic structure of amorphous PFN is found to be substantially disordered, which suppresses the transitions into ordered states in the electric and magnetic dipole subsystems that are inherent in crystalline PFN. The dependence of electrical conductivity $\sigma$ on field frequency $\omega$ is shown to correspond to the law $\sigma\sim\omega^s$, where parameter $s$ decreases linearly with increasing temperature. This law corresponds to a hopping carrier transfer mechanism that is correlated due to the Coulomb interaction.