Abstract
A system of modified figures of merit is studied for fibrous piezo-active composites ‘system of aligned ferroelectric crystal rods – polymer matrix’ with 1–3 connectivity in a wide volume-fraction range of the crystal component. The modified figures of merit are important to estimate an effectiveness of harvesting, accumulating and transducing energy in a piezo-element at a constant mechanical stress or constant strain. Polydomain [001]-poled (1 – x)Pb(Mg1/3Nb2/3)O3 – xPbTiO3 (0.28 x 0.33) and [Liv(K1-yNay)1-v](Nb1-zTaz)O3:Mn (v = 0.06, y = 0.1 … 0.3, z = 0.07 … 0.17) crystals serve as piezoelectric components. Comparison of parameters evaluated for the 1–3 composites by means of the matrix method and effective field method is made. Analysed is the role of electromechanical properties of the crystal component in forming the modified figures of merit of the composite. Based on results on modeling the effective properties and related modified figures of merit, advantages of the lead-free 1–3 composite over its analogs based on (1 – x)Pb(Mg1/3Nb2/3)O3 – xPbTiO3 crystals are shown.
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