Abstract

The (1-x)Pb(Ni_1/3Nb_2/3)O₃-xPb(Zr_1/2Ti_1/2)O₃ (PNN-PZT) ceramic nanocomposites were fabricated via the bimodal particle sizes concept between nanosized PNN and micron-sized PZT powders. Crystal structure, microstructure and dielectric properties of all samples were investigated as a function of composition via a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM) and dielectric spectroscopy techniques. It was found that, in general, the perovskite structure was formed. Broad dielectric transition maxima and high dielectric constant over a wide temperature range were obtained and could be attributed to the densification and compositional fluctuation derived from the employed bimodal particle size precursors.

摘要

通过双峰粒度概念制备了（1- x）Pb（Ni _1/3 Nb _2/3）O ₃ - x Pb（Zr _1/2 Ti _1/2）O ₃（PNN-PZT）陶瓷纳米复合材料。纳米级PNN和微米级PZT粉末。通过X的组合研究了所有样品的晶体结构，微结构和介电性能随成分的变化射线衍射（XRD），扫描电子显微镜（SEM）和介电谱技术。发现，一般而言，形成了钙钛矿结构。在宽温度范围内获得了宽的介电跃迁最大值和高介电常数，这可归因于由所采用的双峰粒度前驱物引起的致密化和组成波动。