Relaxor to ferroelectric crossover in KBT ceramics by prolonged annealing

KBT ceramics were synthesized by the solid-state reaction method and subjected to an annealing at 1000 °C for different time, respectively. The variation of the dielectric behaviors is believed to be related to the normal ferroelectric-relaxor transition of KBT. X-ray diffraction and Raman scattering analysis affirmed the effect of annealing temperature on the phase structure and the local structure of A-site cations, which result in the normal ferroelectric-relaxor switching of KBT.