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Abstract
The behavior of the electric permittivity and polarization of Na0.5K0.5(Nb0.96Sb0.04)O3+0.5mol%MnO2 ceramics as a function of uniaxial pressure (0 – 600 bar) applied perpendicularly to the ac electric field were investigated. The application of a uniaxial pressure causes a reduction of the peak intensity of the electric permittivity (ɛ) and change of the phase transition from first order to second one. The temperature dependence of electric permittivity ɛ shows that the Curie temperature increases with increasing pressure and presents a broadening and flattening of the maximum of ɛ(T). The obtained results suggested an appearance of the dielectric relaxation near the phase transition temperature which strongly coupled with strain induced by the pressure. The effect of uniaxial pressure have an effect on the dynamics of the perovskite lattice.