A comparative study on the dynamic mechanical and electric properties was firstly performed on Ba_1-xCa_xTiO₃ (x = 0.1 ∼ 0.25) ceramics. A diphasic ceramic composed of ferroelectric tetragonal Ba_0.8Ca_0.2TiO₃ and normal dielectric orthorhombic Ba_0.07Ca_0.93TiO₃ solid solutions was obtained near the solubility limit (x = 0.23). The ferroelectric to paraelectric phase transition was clearly characterized by dynamic mechanical analysis (DMA) and dielectric spectrum, but the orthorhombic-to-tetragonal phase transformation for Ba_0.9Ca_0.1TiO₃ was only detected by DMA. Relatively lower internal friction and higher remnant polarization near the solubility limit (x = 0.21–0.25) were found. In addition, the influence of poling and annealing on the mechanical properties of BCT ceramic was investigated.

首先对Ba _1-x Ca _x TiO ₃（x = 0.1〜0.25）陶瓷进行了动态力学性能和电性能的比较研究。在溶解度极限附近（x ＝ 0.23）获得由铁电四方Ba _0.8 Ca _0.2 TiO ₃和普通介电正交晶Ba _0.07 Ca _0.93 TiO ₃固溶体组成的两相陶瓷。动态力学分析（DMA）和介电谱清楚地表征了铁电相变到顺电相变，但是Ba _0.9 Ca _0.1 TiO ₃的正交相变正方相变仅被DMA检测到。在溶解度极限附近（x = 0.21-0.25），发现内部摩擦相对较低，剩余极化较高。此外，研究了极化和退火对BCT陶瓷力学性能的影响。