Calculation of the piezoelectric, dielectric and elastic constants of ferroelectric ceramics

The elastic compliance coefficients s(ik)*(E) ferroelectric ceramics have b een calculated in the state at the arbitrary poling field as functions of t he piezomoduli d(ik)* from the corresponding constants of single-domain cry stal. For instance, it was shown that the crystallite "clamping" effect for s(11)*(E) in ferroceramics is described by equation s(11)*(E)=s(11)*+(2 al pha/3)d(31)*(2) (s(11)* is the elastic compliance coefficients of unpolariz ed ceramics, and the constant alpha is the destressing factor describing th e crystallite interaction).