Lead-free (1-x)BiFeO₃-xBa_1-ySr_yTiO₃ (0 ≤ x ≤ 0.4, 0.0 ≤ y ≤ 0.8) (BF-BST) ceramics were fabricated with the conventional solid-state reaction method. The structural, piezoelectric, multiferroic and magnetoelectric properties have been investigated for these BF-BST solid solutions, especially for the samples near the morphotropic phase boundaries (MPB). Structural analysis shows a coexistence of rhombohedral (R) and tetragonal (T) phases in all the MPB samples, in which the lattice distortion of R and T phases increases overall and decreases, respectively, with increasing y. All the MPB samples show multiferroicity and magnetoelectric effect at room temperature. Both the ferroelectricity and piezoelectricity are found to decrease with increasing y in the MPB samples. It is revealed that high T distortion and low R distortion should contribute dominantly to the high piezoelectricity near MPB in BF-BST solid solutions. These results suggest a possible new strategy for designing high-performance piezoelectric ceramics and also the important role of MPB in the improvement of multiferroicity.

无铅（1- X）的BiFeO ₃ - X的Ba _{1- ý}锶_Ý的TiO ₃（0≤  X  ≤0.4，0.0≤  ÿ  ≤0.8）（BF-BST）陶瓷进行了与常规的固态反应方法制造。已经研究了这些BF-BST固溶体的结构，压电，多铁性和磁电性质，尤其是对于接近变质相界（MPB）的样品。结构分析显示，在所有MPB样品中，菱形（R）和四方（T）相共存，其中R和T的晶格畸变整体随着y的增加而整体增加和减少。所有MPB样品在室温下均表现出多铁性和磁电效应。发现MPB样品中的铁电和压电都随y的增加而降低。结果表明，在BF-BST固溶体中，高T畸变和低R畸变应主要影响MPB附近的高压电性。这些结果为设计高性能压电陶瓷提供了一种可能的新策略，同时也说明了MPB在改善多铁性方面的重要作用。