Piezoelectric composites with a high stability of the piezoelectric modulus under the action of mechanical and temperature fields

New technologies have been proposed for increasing the stability of the piezoelectric modulus $d_{ij}$ of “polymer-ferroelectric/piezoelectric ceramic” composites under the action of mechanical stresses and temperatures. It has been shown that a decrease in the electronegativity of cations or in the covalency of cation-oxygen bonds of the piezoelectric phase, as well as the cyclic electric and thermal polarization and the crystallization under the action of an electric discharge plasma, leads to an increase in the stability of the piezoelectric modulus of polymer-piezoelectric ceramic composites under the mechanical and temperature actions. A possible mechanism has been proposed underlying the effect of an increase in the stability range of the piezoelectric modulus $d_{ij}$ due to the crystallization under the action of the electric discharge plasma, the decrease in the covalency of cation-oxygen bonds of the piezoelectric phase, and the cyclic electric and thermal polarization of piezoelectric composites.