Ba(Ti0.96Sn0.04)O3陶瓷的物性研究

Physical Properties of Ba(Ti_(0.96)Sn_(0.04))O_3 Ceramics

采用传统固相反应法制备了Ba(Ti_(0.96)Sn_(0.04))O_3无铅压电陶瓷,对其压电性能、介电性能、铁电性能和微观结构等进行了研究。研究发现,原料以及制备工艺对Ba(Ti_(0.96)Sn_(0.04))O_3陶瓷的压电性质具有较大的影响。与Ba TiO_3陶瓷相比,Ba(Ti_(0.96)Sn_(0.04))O_3陶瓷的正交–四方相变温度T_(O-T)得到了一定的提高,并且T_(O-T)附近的热滞只有1.8℃。陶瓷的微观形貌呈现出较为复杂的畴结构,主要以90°平行带状畴为主,偶尔有少量不同构型的180°畴。电滞回线呈现为理想的近似矩形饱和形状的曲线,剩余极化强度Pr为18.9μC/cm^2,矫顽场Ec为2.5 k V/cm。此外,非180°畴的翻转是引起陶瓷逆压电常数d_(33)*的主要因素,其值可达550 pm/V。

The Ba（Ti_（0.96）Sn_（0.04））O_3 ceramics were prepared through solid-state reaction route. Piezoelectric property, dielectric property, ferroelectric property, and microstructure were investigated. It is found that raw material and processing technique can largely affect the piezoelectric property of the Ba（Ti_（0.96）Sn_（0.04））O_3 ceramics. By comparing with the physical property of pure Ba TiO_3 ceramics, Sn doping significantly increases the transition temperature from orthorhombic phase to tetragonal phase（T_（O-T）） of the Ba（Ti_（0.96）Sn_（0.04））O_3 ceramic to 36.9℃, while the thermal hysteresis at about T_（O-T） is only 1.8℃. Its microstructure shows complicated domain, mainly composed of simple 90° parallel stripes with a few of different 180° configurations. P-E curve shows ideal square-like and saturated form with remanent polarization Pr of 18.9 μC/cm^2 and coercive field Ecof 2.5 k V/cm. In addition, it is the non-180°-domain switching that leads large converse piezoelectric constant d_（33）＊,（up to 550 pm/V）.