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The electric-field dependencies of the elastic strains ξ3(E) and the converse piezoelectric coefficients d33(E) for ferroelectric ceramics of different degree of ferroelectric hardness have been measured. The observed results have been approximated by the Preisach and Rayleigh polynomials. The nonmonotonic d33(E) dependence for ferroelectric ceramics has been established. The interpretation of the observed results based on a substantially different distribution of reoriented domains over the internal and coercive electric fields in the ceramics of different degree of ferroelectric hardness is given.