Abstract
Dielectric properties of epitaxial heterostructures of perovskite relaxor ferroelectric (RFE) PbMg 1/3 Nb 2/3 O 3, PbSc 0.5 Nb 0.5 O 3, PbMg 1/3 Nb 2/3 O 3 -PbTiO 3, and PbSc 0.5 Nb 0.5 O 3 -PbTiO thin films were studied as a function of frequency (10 2 -10 6 Hz), temperature (77-725 K), and amplitude of applied ac-field (10 2 -10 6 V/m). The true properties of the films were reconstructed and analyzed. In the RFE films, characteristic features of glass-like dielectric behavior were found. However, a detailed analysis the Vögel-Fulcher relationship, local order parameter, and nonlinear dielectric response showed that such a glassy state is unstable.
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