Influence of K0.5Bi0.5TiO3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O3 ceramics

摘要: Abstract A new lead-free ferroelectric solid solution between (Ba,Ca)(Zr,Ti)O3 (BCZT) and K0.5Bi0.5TiO3 (KBT) has been systematically investigated in terms of its phase transformations, microstructure, dielectric properties. The incorporation KBT into BCZT was found to enhance the sintering behavior, although secondary phases K4Ti3O8 BaBi4Ti4O15 were detected at high contents. Chemical heterogeneity also observed form core-shell grain structures comprising tetragonal BCZT-rich cores with pseudo-cubic relaxor KBT-rich shell regions. Temperature-dependent property measurements revealed that BCZT-KBT ceramics exhibited both normal behaviour simultaneously, associated directly structure. Ferroelectric hysteresis indicated remanent polarisation coercive field strongly dependent on content. In common other ferroelectrics, increasing temperature led formation constricted polarisation-electric loops, indicating occurrence a reversible electric field-induced nanopolar long-range ordered state.