Frequency dielectric response of ferroelectric-magnetic ceramic composites like PbZr0.65Ti0.35O3-BaFe12O19

Abstract:  The dielectric properties of PbZr0.65Ti0.35O3-BaFe12O19 (PZT BaM) multiferroic ceramic composites, obtained from the conventional solid-state reaction method, have been investigated. While there is some dielectric dispersion at low frequencies, the highly-stable values of dielectric permittivity over a wide frequency range, together with low dielectric losses (similar to 10(-3)), make these composites suitable for practical radio-frequency and potential microwave device applications. Toward high frequencies, the data reveal an anomalous resonance-like phenomenon. This resonance phenomenon is connected to an over-damped resonance mechanism for the vibration of the boundaries of polar regions, associated with the ferroelectric phase. A noticeable dependence of the parameters characterizing this last dielectric dispersion with the BaM concentration is found, indicating a strong influence of the magnetic phase on the dynamics of the ferroelectric domain-wall motion. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Author(s): Guerra, JDS; McIntosh, R; M’Peko, JC; Hernandes, AC; Guo, R; Bhalla, AS

CERAMICS INTERNATIONAL

DOI: 10.1016/j.ceramint.2015.02.017