Dielectric relaxation properties of ternary Pb(In1/2Nb1/2)O3-0.49Pb(Mg1/3Nb2/3)O3-0.27PbTiO3 (PIMNT27) and binary Pb(Mg1/3Nb2/3)O3-0.27PbTiO3 (PMNT27) single crystals have been investigated. The dielectric constant peak temperature Tm with frequency obeys the Vogel-Fulcher (V-F) law. The dielectric constants at temperatures above Tm can be described by the Lorenz-type relationship. The fitting parameter δA and ΔTm of PIMNT27 are higher than those of PMNT27, indicating stronger relaxation in ternary PIMNT system. Local nanodomain structures were measured by the piezoelectric force microscopy (PFM). The average autocorrelation function technique was applied to quantify these nanoscale domain patterns. The PIMNT27 exhibits smaller size nanodomains and shorter mean local short-range correlation length compared to PMNT27. The enhanced local disorder in PIMNT is related to the introduction of In3+ in PMNT system, which can enhance the disorder of B-site ions. In addition, the evolution of local polarization rotation under a step-increased tip dc voltage and the mean local short-range correlation length <ξ> as a function of dc voltage were obtained for both PIMNT27 and PMNT27 single crystals, which are crucial parameters for the understanding of the relationship between dielectric relaxation and local domain structures in relaxor-PbTiO3 systems.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry