Effect of Bi non-stoichiometry is one of the big issues in BiFeO₃-BaTiO₃ (BF-BT) ceramics that have not been resolved clearly. Therefore, 0.65Bi_1+xFeO₃-0.35BaTiO₃ (x = 0–0.06) ceramics were synthesized by a conventional solid-state reaction at different sintering temperatures (T_S) to control the Bi non-stoichiometry, which can be varied by the sublimation and/or evaporation of Bi⁺³ ions during sintering process. The effects of Bi chemical pressure on crystalline phase, microstructure, dielectrics, and piezoelectric properties of BF-BT were evaluated. X-rays diffraction revealed a single perovskite structure with pseudo-cubic symmetry. A prominent enhancement was noticed at x = 0.05 in ferroelectric, dielectric and piezoelectric properties. Typical ferroelectric behaviors were obtained, while unipolar and bipolar strains were enhanced with increasing Bi content. The maximum piezoelectric properties were found at T_S = 1000 °C with x = 0.05, having d^∗₃₃ = 270 pm/V at 5 kV/mm with Curie Temperature (T_C) = 432 °C.

毕非化学计量的效应是对的BiFeO重大问题一个₃ -BaTiO ₃（BF-BT）还没有被清楚地分辨陶瓷。因此， 通过传统的固相反应在不同的烧结温度（T _S）下，通过控制非化学计量比Bi可以合成0.65Bi _{1 + x} FeO ₃ -0.35BaTiO ₃（x = 0-0.06）陶瓷。Bi ⁺³的升华和/或蒸发离子在烧结过程中。评估了Bi化学压力对BF-BT的晶相，微结构，介电常数和压电性能的影响。X射线衍射显示具有伪立方对称性的单个钙钛矿结构。在x  = 0.05时，铁电，介电和压电性能显着增强。获得了典型的铁电行为，而随着Bi含量的增加，单极和双极应变得以增强。发现最大压电性能在T _S  = 1000°C且x  = 0.05时，d ^* _{3 3}  = 270 pm / V在5 kV / mm时居里温度（T _C）= 432°C。