烧结升温速率对钛酸钡陶瓷压电性能的影响

Effect of Sintering Heating Rate on Barium Titanate Ceramic Piezoelectric Properties

采用固相反应方法在不同烧结升温速率下制备了BaTiO_3陶瓷,并对陶瓷样品的晶体结构、表面形貌、介电、压电和铁电性能进行了测试和分析。结果表明:当烧结升温速率为3℃/min和5℃/min时陶瓷均为四方钙钛矿晶格结构,随升温速率的增大,四方相程度增强,材料平均晶粒尺寸减小,压电系数和铁电性能随之降低,但介电常数随之增大,当烧结升温速率为5℃/min介电常数最大,其值为3144。当烧结升温速率为1℃/min时陶瓷为正交钙钛矿晶格结构d_(33)和P_r最大,其值为P_r=10μC/cm^2和d_(33)=193 pC/N。

BaTiO_3 ceramics were prepared by traditional solid state reaction method at different heating rates and the crystal structure,surface morphology,dielectric,piezoelectric and ferroelectric properties of ceramic samples were tested and analyzed. The results show that when the sintering temperature rate is 3℃/min and 5 ℃/min,the ceramic is tetrahedral perovskite lattice structure. With the increase of the heating rate,the tetragonal phase increases while the average grain size decreases,electrical coefficient and the ferroelectric properties decrease with it. However,the dielectric constant increases. When the sintering temperature rate is 5 ℃/min,dielectric constant is the largest with the value of 3144. When the sintering temperature rate is 1 ℃/min,the ceramic is orthorhombic perovskite lattice structure,of which the d_（33） and P_r is the maximum,its value is P_r= 10 μC/cm^2 while d_（33）= 193 pC/N.