溶胶-水热法合成PZT纳米粉体及性能研究

PZT nanoparticles synthesized by sol-hydrothermal method and properties

结合溶胶-凝胶和水热法的优点,采用改进的溶胶-水热复合法在较低温下制备出纯相PZT纳米粉体,并对粉体的烧结性能进行了研究,分别讨论了烧结温度、保温时间等工艺参数对烧结陶瓷密度、微观结构和压电性能的影响.270℃保温热处理2 h可合成出粒径约为20～30 nm,具有良好分散性的钙钛矿型PZT纳米粉体,且具有良好的烧结活性.在1150℃烧结保温2 h,压电性能达到最优（机电耦合系数：0.50,机械品质因数：410,压电常数：220 pC/N,介电常数：1 060）.结果表明,溶胶水热复合法具有合成温度低、组分易于控制、粉体烧结活性高的优点.

PZT nanopowders were fabricated at low temperature by modified sol-hydrothermal method, and the effects of the sintering parameter such as sintering temperature, keeping time on the density, grain size, piezoelectric and dielectric properties of the PZT ceramic were investigated. The results show that the particle size distribution of the PZT nanopowders synthesized 270 ℃is homogeneous with pure perovskite structure （20 -30 nm）. The optimal properties of the obtained piezoelectric PZT ceramic sintered at 1 150 ℃ for 2 h are planna electromechanical coupling factor： 0.50, mechanical quality factor： 410, piezoelectric constant： 220 pC/N, dielectric constant： 1 060, respectively. Compared with conventional solid reaction methods for PZT powders, the advantage of the modified sol-hydrothermal method are low synthesis temperature and high sintering activity of the powders.