温度对无铅换能器陶瓷BNT-7BT铁电性的影响

发布时间：2018-04-26 04:13

  本文选题：无铅铁电陶瓷 + 相变　； 参考：《压电与声光》2017年01期

【摘要】：传统换能器材料——PZT95/5铁电陶瓷中的铅元素对环境污染大,且其电致应变(S)和压电系数(d33)较小,因此限制了换能器的输出功率。该文从保护环境和优化换能器性能的角度出发,研制出位于准同型相界处的无铅铁电陶瓷0.93Bi_(0.5)Na_(0.5)TiO_3-0.07BaTiO_3(BNT-7BT),测试了其晶体结构和介电温谱曲线,并得到了温度对该陶瓷电滞回线及电致应变曲线的影响。实验结果表明,钙钛矿结构的无铅铁电陶瓷BNT-7BT在152℃处发生铁电→反铁电相变,且其具有较大的电致应变量(室温下S≈2.92‰)和较高的压电系数(d33=152pC/N)。
[Abstract]:The traditional transducer material, PZT95 / 5 ferroelectric ceramic, has high environmental pollution, and its electrically induced strain (S) and piezoelectric coefficient (D33) are small, which limits the output power of the transducer. In order to protect the environment and optimize the performance of the transducer, a lead-free ferroelectric ceramic 0.93BiJ _ 0.5NaO _ (0.5) tio _ (3-0.07) BaTiO3BNT-7BTT has been developed at the quasi-homogenous phase boundary. The crystal structure and dielectric temperature spectra have been measured. The effect of temperature on the hysteresis loop and strain curve of the ceramic was obtained. The experimental results show that the perovskite-structure lead-free ferroelectric ceramics (BNT-7BT) have ferroelectric antiferroelectric phase transition at 152 鈩，

本文编号：1804424