Evolution of connectivity patterns and links between interfaces and piezoelectric properties of two-component composites

We report the results of studying the evolution of α-β connectivity patterns and the role of systems of interfaces inherent in two-component piezoactive composites. A scheme demonstrating links between so-called `junction' 2-2, 1-1, 1-3, and 3-1 connectivity patterns, and all the rest α-β connectivity patterns (α,β = 0,1,2, and 3) is first put forward. Important features of the evolution of the connectivity patterns and versions of the formation of the α-β ceramic/polymer composite structures are discussed. On the basis of the approach developed in this paper the 1-2 ceramic/polymer composite (point symmetry group mm2) and some peculiarities of its piezoelectric properties are first analysed. Physical and microstructural reasons for an original competition between effective piezoelectric coefficients d₃₁* and d₃₂* or e₃₁* and e₃₂*, as well as reasons for max e₃₃* of the 1-2 composite are considered in connection with concentration behaviour of piezoelectric properties of the 1-1 and 1-3 composites.