(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；
2. 中电科技集团重庆声光电有限公司，重庆 401332)
摘 要: 采用静电纺丝法制备无铅压电陶瓷0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BCZT)纳米线，重点研究制备工艺优化和纳米线的压电性能。首先探索稳定性优异的BCZT溶胶配置方法，再利用静电纺丝法制备BCZT纳米线，研究静电纺丝参数和热处理条件对BCZT纳米线形貌和结晶性的影响。结果表明：最佳的静电纺丝工艺参数为环境温度40 ℃、环境湿度50%RH、施加电压15 kV、供液速度1.00 mL/h、滚筒收集转速800 r/min、接收距离15 cm。经过(120 ℃, 12 h)的烘干处理以及(900 ℃, 1 h)的退火处理，可以获得纯钙钛矿相、结晶性好、长径比大的BCZT纳米线。利用压电力显微镜分析该纳米线的压电响应，证实其具有多畴结构和明显的极化反转行为。
关键字: 锆钛酸钡钙；纳米线；静电纺丝；压电响应
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Chongqing Acoustic-Opitc-Electronic Co., LTD., Chongqing 401332, China）
Abstract:The electrospinning preparation optimization of lead-free piezoelectric 0.5Ba(Zr0.2Ti0.8)O3- 0.5(Ba0.7Ca0.3)TiO3 (BCZT) nanowires and the piezoelectric response were investigated systematically. The preparation of stable BCZT sol was firstly explored for obtaining the electrospinning solution. The study was mainly focused on the effects of electrospinning and heat treatment parameters on the morphology and crystallinity of prepared BCZT nanowires. The results show that optimized electrospinning parameters are as follows: ambient temperature of 40 ℃, humidity of 50%RH, voltage of 15 kV, solution supply speed 1.00 mL/h, roller speed of 800 r/min, distance between needle tip and roller of 15 cm. The electrospinning BCZT nanowires are dried at 120 ℃ for 12 h and then annealed at 900 ℃ for 1h. As a result, pure perovskite-structured, highly crystalline, and dense BCZT nanowires with a large aspect ratio can be obtained. Moreover, the PFM measurement indicates the piezoelectricity of as-prepared BCZT nanowires, which is evidenced by the obvious ferroelectric domain structure and local polarization switching behavior.
Key words: BCZT; nanowire; electrospinning; piezoelectricity
