Dielectric and pyroelectric properties in the Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃system

TLDR

The study measured dielectric constants, losses of poled and unpoled PMN‑PT ceramics, and pyroelectric coefficients and spontaneous polarization via the static Byer‑Roundy method across temperatures and compositions. Anomalous dielectric and pyroelectric behavior was observed near the morphotropic phase boundary (x≈0.4) and for compositions 0.275–0.35 PT, indicating significant contributions from phase coexistence.

Abstract

Abstract Dielectric and pyroelectric properties of relaxor ferroelectric in the (1-x) Pb(Mg1/3Nb2/3)O3-xPbTiO3 solid solution series have been investigated. The dielectric constant (K) and loss of poled and unpoled ceramic samples were determined. The pyroelectric coefficient and the spontaneous polarization were measured by the static Byer-Roundy method as a function of temperature and for various compositions in the binary system PMN-PT. An important contribution to the dielectric and pyroelectric behavior for the solid solutions compositions close to the morphotropic phase boundary (x ∼ 0.4) between pseudocubic and tetragonal regions existing in the grains of the ceramic were observed. Anomalous dielectric and pyroelectric behaviors occurred for compositions x = 0.275 ∼ 0.35 mole% PT in the vicinity of morphotropic phase boundary.