【摘要】 采用传统固相反应法制备系列BaHf_xTi_1-xO₃陶瓷,通过对陶瓷的压电、铁电、相组成、晶粒尺寸的测试和分析,发现:所有BaHf_xTi_1-xO₃陶瓷样品均具有纯钙钛矿结构,室温均为铁电体具有压电性;在x<0.1时室温压电系数为195～327p C/N,x=0.02时,压电系数、剩余极化强度和平均晶粒尺寸最大,分别为327pC/N, 13.3μC/cm²和37.2μm,大晶粒尺寸和四方-正交-三方多相共存是其具有大压电系数的主要原因。更多还原

【Abstract】 BaHf_xTi_1-xO₃ ceramics were prepared by traditional solid-state reaction,and their piezoelectric and ferroelectric properties,phase composition,and grain size were characterized and analyzed. The results indicate that all ceramics have pure perovskite structure,and are ferroelectric at room temperature with piezoelectricity. At x<0. 1,the piezoelectric coefficient is195-327pC/N. The ceramic at x= 0. 02has the highest piezoelectric coefficient of327p C/N,residual polarization strength of13. 3 μC/cm²,and average grain size of37. 2 μm. The high piezoelectric coefficient is due to the large grain size and coexistence of the tetragonal-orthogonal-rhombohedral multiphase.更多还原