摘要：通过传统的固相烧结法在1430℃至1500℃的温度下烧结2小时制备了(Ba0.85Ca0.15)(Ti0.9Zr0.1)O3(BCZT)无铅压电陶瓷，并研究了烧结温度对陶瓷的微观结构和电学性能的影响。X射线衍射结果表明，所有BCZT陶瓷样品均表现出典型的钙钛矿结构，且存在正交和四方相共存。陶瓷样品的致密度随烧结温度的升高而增大，并且在烧结温度为1460℃时达到最大值，为97.42%，继续升高温度，陶瓷的致密度下降，但在1500℃时仍然有91.93%。BCZT陶瓷的室温介电常数和介电损耗均随频率的增加而降低。烧结温度为1470℃的陶瓷样品有最高的居里温度(Tc=92.3℃)。1500℃烧结的陶瓷在极化电压为2.5kV/mm时获得最大压电常数(d33=369.12pC/N)。陶瓷在1460℃下烧结且极化电压为3kV/mm得到较佳铁电性(Ec=2.9717kV，Pr=12.8458μC/cm2)。
关键词：BaTiO3；压电性；介电性；铁电性
Abstract:
(Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 (BCZT) lead-free piezoelectric ceramics were prepared at 1430℃ to 1500℃ for 2 hours by conventional solid-state sintering method. The effects of the sintering temperature on the microstructure and electrical properties of the ceramics were investigated．X-ray diffraction suggested typical perovskite structure of all the BCZT samples and the orthorhombic and tetragonal phase co-existed in ceramics. The relative densities of all the ceramics increase with sintering temperature, and reach its maximum at 1460℃(97.42%),further increase of the temperature leads to the decrease of the density, while still remaining 91.93% at 1500℃. Both of the dielectric constant and dielectric loss of the BCZT ceramics decrease with the increasing of the frequency. The highest curie temperature of the BCZT samples was achieved at 1490℃(Tc=92.3℃). The BCZT ceramics sintered at 1490℃attained a maximum d33 of 369.12pC/N(dc fields 2.5kV/mm).The optimized ferroelectric properties of the ceramics was obtained at 1460℃ and poled at 3kV/mm(Ec= 2.9717kV ,Pr=12.8458μC/cm2 ) .
Key words: BaTiO3; Piezoelectric property; Dielectric property; Ferroelectric property
