中文摘要：

本工作采用高能球磨法合成高活性NaNbO3粉体，并对机械化学合成机制与致密化烧结行为进行探讨与分析。研究发现，以碳化钨为磨介，通过调整球料比和转速等工艺参数，可在1.5h内免煅烧一步合成纯钙钛矿相NaNbO3纳米粉体。与文献报道相比，本实验合成纯NaNbO3的高能球磨时间显著缩短，这与优化实验条件下碳化钨磨介高的撞击能量(457mJ/hit)相关。进一步，对NaNbO3纳米粉体的致密化烧结与陶瓷电学性能进行研究。结果发现，以高能球磨法合成纳米粉体为前驱体制备的陶瓷具有高致密的细晶结构，且在宽温区内介电性能相较于传统方法合成陶瓷显著提升。本工作表明，高能球磨法不仅能够快速合成纳米粉体，有利于制备细晶陶瓷，而且密闭的机械化学反应环境有利于抑制碱金属挥发，控制目标体系计量比，因而在构建高性能碱金属铌酸盐电子陶瓷元器件领域潜在重要应用。

英文摘要：

In this work,the high activity NaNbO3nano-powders have been synthesized by high-energy ball milling method,and the relatedmechanochemical mechanism and densification sintering behavior have been investigated in detail.The study revealed that by tailoring therotating speed and ball-to-powder weight ratio,the pure perovskite NaNbO3nano-powders can be synthesized within1.5h by using tungstencarbide ball as grinding media.Compared with the literature data,the synthesis time of pure NaNbO3has been significantly shortened,whichcan be attributed to the high impact energy(457mJ/hit)in optimal experimental conditions.Further,the densification sintering behavior andelectrical properties have been investigated.It was found that the ceramic body derived from nano-powders presents high dense fine grainedstructure,and the dielectric property in a wide temperature region was improved greatly.These results suggested that high-energy ball millingmethod not only is conductive to synthesize highly active nano-powders,but also is in favor of preventing the volatilization of alkali metals,showing potential application in building high-performance alkaline niobate based multilayer ceramic electronic components.