Abstract
Dielectric and piezoelectric properties of K(Ta0.51Nb0.49)O3 [KTN] single crystals along [100], [001] and [011] pseudo-cubic crystallographic orientations are reported and discussed. Temperature dependences of the dielectric permittivity in tetragonal phase of monodomain and polydomain crystals of these orientations are compared. A strong dielectric anisotropy is found in the tetragonal phase, with an ϵ[100] / ϵ[001] ratio equal to 16 at 300 K. Room temperature piezoelectric coefficients for the monodomain state of KTN are reported.
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