Strain-gradient-induced electric polarization in lead zirconate titanate ceramics

Ma, Wenhui; Cross, L. Eric
May 2003
Applied Physics Letters;5/12/2003, Vol. 82 Issue 19, p3293
Academic Journal
Strain-gradient-induced polarization or flexoelectricity was investigated in unpoled soft lead zirconate titanate (PZT) ceramic where the texture symmetry [SUP∞ ∞]m forbids macropiezoelectricity. Even under high strain gradient (1 m[SUP-1]) the induced polarization is small (1.6 μC/m[SUP2]) at 20°C. Higher strain gradients induce ferroelastic poling and an additional extrinsic contribution to the flexoelectric coefficient μ[SUB12] raising the value from 0.5 to 2.0 μC/m. Cooling through the Curie point (T[SUBC]) under maximum stress (80 MPa) where the peak permittivity (∼20 000) could raise μ[SUB12] to 20μC/m, the equivalent electric field is still only ∼1 kV/m, inadequate to achieve significant ferroelectric poling. The situation may be different in thin PZT films where much larger strain gradients can occur.


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