Anisotropy of electromechanical properties in KNbO₃crystals with S-type domain boundaries

In this paper a large anisotropy of piezoelectric moduli of d ij p KNbO 3 crystals with S-type boundaries separating 60 degrees (120 degrees ) domain regions in the ferroelectric Bmm2 phase is established for the first time. The sensitivity of this effect to changes in initial dielectric, piezoelectric and elastic constants of the corresponding single-domain crystal is discussed.