Abstract
(1-x)BiFe0·94Zn0·03Ti0·03O3-xBaTiO3 (BFZN-BT) ceramics are prepared via sol-gel method, followed by conventional solid-state sintering or two-step sintering processes. Then, systematic experimental characterization and performance evaluation are carried out to investigate this technique and its effects on eight different ceramic samples. Owing to morphotropic phase boundary and optimal sintering conditions, 0.7BiFe0·94Zn0·03Ti0·03O3-0.3BaTiO3 ceramic sintered at T1 = 1025 °C and T2 = 900 °C shows the largest rhombohedral distortion (90°−αR = 0.14°) and tetragonal distortion (cT/αT = 1.021), as well as low leakage (1.19 × 10−5 A/cm2), excellent d33 = 149 pC/N, 2Pr = 85.1 μC/cm2 and Curie temperature of 461 °C. Moreover, large unipolar strain of 0.307% and d33∗ value of 516 p.m./V are also obtained for this ceramic. Overall, the proposed strategy exhibits promise in the advancement of eco-friendly lead-free piezoceramics.
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