Li Jianhua
College of Police Equipment and Technology, Chinese People's Police University, Langfang 065000, China.
Materials (Basel). 2022 Feb 14;15(4):1389. doi: 10.3390/ma15041389.
Lead zirconate titanate (PZT)-based ceramics are used in numerous advanced applications, including sensors, displays, actuators, resonators, chips; however, the poor mechanical characteristics of these materials severely limits their utility in composite materials. To address this issue, we herein fabricate transgranular type PZT ceramic nanocomposites by a novel method. Thermodynamically metastable single perovskite-type Pb(ZrTi)NbO powders are prepared from a citrate precursor before both monoclinic and tetragonal ZrO nanoparticles ranging from 20 to 80 nm are precipitated in situ at a sintering temperature of 1260 °C. The effects of ZrO content on the microstructure, dielectric, and piezoelectric properties are investigated and the mechanism, by which ZrO toughened PZT is analyzed in detail. The ZrO nanoparticles underwent a tetragonal to monoclinic phase transition upon cooling. The fracture mode changed from intergranular to transgranular with increasing ZrO content. The incorporation of ZrO nanoparticles improved the mechanical and piezoelectric properties. The optimized piezoelectric properties (/ = 1398, tan = 0.024 = 354 pC N, = 0.66 = 78) are obtained when = 0.02. initially increased and subsequently decreased with increasing ZrO content. The highest = (387 °C) and lowest / was obtained at = 0.01.
锆钛酸铅（PZT）基陶瓷被用于众多先进应用中，包括传感器、显示器、致动器、谐振器、芯片；然而，这些材料较差的机械性能严重限制了它们在复合材料中的应用。为了解决这个问题，我们在此通过一种新方法制备了穿晶型PZT陶瓷纳米复合材料。由柠檬酸盐前驱体制备出热力学亚稳的单钙钛矿型Pb(ZrTi)NbO粉末，然后在1260℃的烧结温度下原位沉淀出20至80nm的单斜相和四方相ZrO纳米颗粒。研究了ZrO含量对微观结构、介电和压电性能的影响，并详细分析了ZrO增韧PZT的机理。ZrO纳米颗粒在冷却时经历了从四方相到单斜相的转变。随着ZrO含量的增加，断裂模式从沿晶转变为穿晶。ZrO纳米颗粒的加入改善了机械和压电性能。当 = 0.02时获得了优化的压电性能（/ = 1398，tan = 0.024 = 354 pC N， = 0.66 = 78）。 最初随着ZrO含量的增加而增加，随后下降。在 = 0.01时获得了最高的 =（387℃）和最低的/ 。
