Sergey Lopatin

Magnetoelectric PZT/ferrite composite material

Abstract The PZT/ferrite composite materials of different types of connectivity were prepared and investigated. The firing of powder mixtures, hot pressing, alternative slicing of piezoelectric ceramic and ferrite and other techniques were used to produce the magnetoelectric composites. The most high values of the magnetoelectric coefficient ΔE/ΔH were found in sintered mixtures of PZT powders with ferrite and sliced materials with 35–55 wt% of ferrite. The magnetoelectric response sharply increased with increase of bias magnetic field up to 0.5–1.0 kOe. Meanwhile, the magnetoelectric composites showed a significant piezoelectric sensitivity and this property is to be taken into account when sensors are being designed.

Theoretical and experimental investigation of porous PZT ceramics

Abstract A theoretical simulation of the dielectric, elastic and piezoelectric properties of porous PZT ceramic was carried out in terms of the finite element method and averaging theory. Based on the definition of a porous PZT ceramic as a three component composite with polarised ceramic elements, nonpolarised ceramic elements and air inclusions, close agreement between the calculated and experimentally measured properties was obtained.