A normal to relaxor ferroelectric transition was induced by the substitution of BaZrO 3 for LiTaO 3 in a typical lead‐free (K,Na)(Nb,Sb)O 3 –LiTaO 3 –BaZrO 3 system and this was found to accompany a tetragonal to rhombohedral phase structural transformation. The typical relaxor behavior characterized by diffuse phase transition and frequency dispersion was identified by the measurement of frequency‐dependent dielectric permittivity. The transmission electron microscopy studies demonstrated that the above phenomenon would be closely related to the domain morphology evolution from normal micron‐sized lamellar domains, to tweed‐like domains and finally to polar nanodomains. Selected area and convergent beam electron diffraction patterns further confirmed that the composition (2.5 mol% BaZrO 3 ) exhibited rhombohedral and tetragonal phase coexistence. The evolution of domain morphology with temperature also disclosed the diffuseness of ferroelectric phase transition.
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Zuo et al. (2011) studied this question.
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