ELECTROMECHANICAL COEFFICIENTS OF MAGNETOELECTRIC PZT–CoFe₂O₄ COMPOSITE

Abstract

The magnetoelectric property of composite materials consisting of piezoelectric and piezomagnetic constituents are of interest since the stresses induced in them on application of an external magnetic field are converted into electrical signals. The electrical output is primarily due to electromagnetic coupling between the two participating phases. The present paper deals with the evaluation of the electromechanical coupling in the magnetoelectric composite consisting of 50% lead zirconate titanate (Pb0.96Sr0.04Ti0.47Zr0.53O3) and 50% CoFe2O4, the composition having maximum magnetoelectric conversion efficiency. A sum rule is proposed to calculate the electromechanical coupling coefficient and the results are correlated with the experimental data.

Effect of CoFe2O4 content on the dielectric and magnetoelectric properties in Pb(ZrTi)O3/CoFe2O4 composite

“…An additional peak is clearly observed at 182°C at 1 MHz. This peak is similar to the kink occurred in the permittivity-temperature characteristics of pure PZT ceramics [7]. Figure 5 shows the ME coefficient at 1 kHz as a function of dc magnetic bias.…”

“…4. The Curie temperature for PZT and CFO are 200 and 520°C [7], respectively. The Curie temperature of the sample 1250-1 is the same as that of PKI552 ceramic, viz.…”

Mechanical properties of Ni0.83Co0.15Cu0.02Fe1.9O4−δ+PbZr0.52Ti0.48O3 particulate composites by composite oscillator technique and the correlation with the results of magnetoelectric properties

“…Ryu et al [17], Cai et al [18] also observed this type of behavior in PZT+Terfenol-D, PZT+Terfenol-D+PZT laminated composites respectively. Srinivas et al [19] evaluated the electromechanical coupling coefficients in 50% PZT+50% CoFe 2 O 4 composites. As shown in the microstructure [14], the distribution of ferrite particles become more uniform and less connected when the amount of ferrite was low.…”

Enhanced mangnetoelectric voltage in multiferroic particulate Ni0.83Co0.15Cu0.02Fe1.9O4−δ/PbZr0.52Ti0.48O3 composites – dielectric, piezoelectric and magnetic properties

“…The magnetic behaviour of ferrites depends on the number of parameters like cation distribution, site preference energies, covalency of bonds and the molecular field [26,27]. Theoretically, the ME output in the composites should increases with the ferrite content and it would be maximum for the composite with 50% ferrite and 50% ferroelectric provided that there is no depolarizing field [28].…”

“…Ryu et al [31], Cai et al [32] also observed this type of behaviour in PZT + Terfenol-D, PZT + Terfenol-D+ PZT laminated composites respectively. Srinivas et al [28] also evaluated the electromechanical coupling coefficients in 50% PZT + 50% CoFe 2 O 4 composites.…”