中文摘要：

以MgO和Nb2O5为原料,用高能球磨法制备Mg4Nb2O9前驱体,前驱体经900℃热处理合成Mg4Nb2O9纳米粉体.采用X射线衍射和扫描电镜(Scanning Electron Microscopy,SEM)研究了粉体随合成温度、球磨时间、保温时间的微结构变化和物相转变过程.结果表明,MgO-Nb2O5混合物经60 h高能球磨在900℃保温3 h合成出粒径为50~80 nm的Mg4Nb2O9纳米粉体.高能球磨法制备的粉体在1 200℃可烧结成致密的具有优异性能的Mg4Nb2O9陶瓷.

英文摘要：

The Mg4Nb2O9 nanopowders are prepared at 900℃ by high-energy ball-milling.The influences of calcining temperature、milling time and dwell time of the formation temperature on the microstructure and the phase composition of single phase Mg4Nb2O9 powders are investigated by the X-ray diffraction(XRD) and scanning electron microscopy(SEM).It is found that the single phase Mg4Nb2O9 nanopowders grain with the size of 50～80 nm are sythesized at 900℃ for 3 h by high-energy ball-milling method.The dense Mg4Nb2O9 cer...