近日，孔令兵教授在第十一届先进陶瓷国际研讨会Perovskite分会做了题为“Mechanochemical Synthesis of Perovskite Ferroelectric Ceramic Powders “的要求报告，系统地总结了高能机械化学法在直接合成具有钙钛矿结构的铁电纳米粉体方面的研究进展。
High energy mechanochemical milling process has shown that some ferroelectric materials can be synthesized directly from their oxide precursors in the form of nano-sized powders, without the need for the calcination at intermediate temperatures, thus making the process very simple. A large number of ferroelectric materials, including lead-containing ferroelectrics, antiferroelectrics and relaxors, and bismuth-containing Aurivillius families, have been synthesized by the high-energy milling process. Ferroelectric ceramics derived from the activated precursors demonstrated finer microstructure and higher electrical properties than those without mechanochemical treatment. This talk will present an overview of the progress in the synthesis of ferroelectric ceramic powders using various high-energy milling techniques. The progress includes several aspects: (i) direct synthesis of nano-sized powders with better sinterability, (ii) promoted reactive sintering due to the modification of the precursors, (iii) amorphization of the precursors, and (iv) refinement of the precursors with high homogeneity. The underlying mechanisms of mechanochemical synthesis of ferroelectric materials will be discussed. Further research emphasises on issues related to the synthesis of ferroelectric ceramic powders are suggested.