Abstract
The structure, dielectric, and ferroelectric properties of Li/Ga-modified BaTiO3 ceramics were investigated and analyzed. As the Li/Ga doping content x ≥ 0.02, an evident structure transformation occurred from the ferroelectric tetragonal to hexagonal phase due to the Li/Ga dopants replacing Ti-sites. Rietveld refinement results proved an increased content of hexagonal phase with the co-doping. The dielectric measurement results showed that an obvious transition from a typical ferroelectric behavior for the undoped samples to a highly diffusive phase transition (DPT) behavior for the Li/Ga-modified BT ceramics. The diffuseness coefficient γ was found to increase with an increase in the Li/Ga content. The relaxor-like phenomenon can be attributed to the disruption of long-range ferroelectric order and the structure evolution of from tetragonal to hexagonal phase. The slim and thin-waisted hysteresis loops were observed for x = 0.01 and x = 0.02, which may originate from the defect dipoles and relaxor-like behavior.
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