Title: Nonlinear dynamics of polar regions in paraelectric phase of (Ba1-x,Srx)TiO3 ceramics,
Abstract: The dynamic dielectric nonlinearity of barium strontium titanate
(Ba1-x,Srx)TiO3 ceramics is investigated in their paraelectric phase. With the
goal to contribute to the identification of the mechanisms that govern the
dielectric nonlinearity in this family, we analyze the amplitude and the phase
angles of the first and the third harmonics of polarization. Our study shows
that an interpretation of the field-dependent polarization in paraelectric
(Ba1-x,Srx)TiO3 ceramics in terms of the Rayleigh-type dynamics is inadequate
for our samples and that their nonlinear response rather resembles that
observed in canonical relaxor Pb(Mg1/3Nb2/3)O3.