采用固相烧结法制备了φ15 mm×0.1 mm的(Na0.52 K0.44 Li0.04) (Nb0.9 Sb0.04 Ta0.06) O3压电陶瓷,研究了其微观结构、电学性能以及热退极化性能;将该陶瓷封装制成蜂鸣器,测试了其声学性能并与市购铅基蜂鸣器进行了对比.结果表明:该陶瓷具有单一的四方相钙钛矿结构,在低于其居里温度(265℃)条件下的压电常数、机电耦合系数分别约为280 pC·N-1,达到未升温陶瓷的89.2％,温度稳定性好;在1～4 kHz、9V交流电条件下,由该陶瓷组装的蜂鸣器的声压级略小于铅基蜂鸣器的,在2 kHz、3V条件下则大于铅基蜂鸣器的,且该蜂鸣器在-40～85℃的声学性能稳定.
(Na0.52K0.44Li0.04) (Nb0.9Sb0.04Ta0.06) O3 piezoelectric ceramics with size of φ 15 mm × 0.1 mm was prepared by solid-state sintering method,and then the microstructure,electrical property and thermal depolarization property of the ceramics were studied.The ceramics were packaged into a buzzer and the acoustic property of the buzzer was measured and compared with that of the commercial lead-based one.The results show that the ceramics had the pure perovskite phase (tetragonal) structure.Below the Curie temperature (265 ℃),the piezoelectric constant were about 280 pC·N-1 and reached 89.2％ that of the unheating ceramics,indicating the good temperature stability.The sound pressure level of the buzzer made of the ceramics was slightly lower under the conditon of (1-4) kHz/9 V while better under the condition of 2 kHz/3 V than that of the lead-based one.Moreover,the acoustic property of the ceramic buzzer kept stable at temperatures between-40 ℃ and 85 ℃.
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