微波诱导合成固体快离子导电材料

Synthesis of Fast Ionic Conductor by Microwave Method

采用微波法合成了具有快离子传输性质的系列磷锑酸钾化合物Ｋ３Ｓｂ３Ｐ２Ｏ１４、Ｋ２ＳｂＰＯ６、ＫＳｂＰ２Ｏ８、ＫＳｂ２ＰＯ８和Ｋ５Ｓｂ５Ｐ２Ｏ２０以及系列锗锌酸锂固熔体Ｌｉ２＋２ｘＺｎ１－ｘＧｅＯ４（—０．３６＜ｘ＜０．８５）．粉末Ｘ射线衍射和扫描电镜研究表明，微波合成的样品晶形规整，粒度小且均匀，与传统的高温固相反应相比，微波诱导合成具有反应速度快，易于控制和反应选择性高等特点。在一定温度下微波辐射加快了反应物与产物界面间的离子扩散与传输速率。

A series of potassium vanadium phosphates K3Sb3P2O14,K2SbPO6,KSbP2O8,KSb2PO8,K5Sb5P2O2O and Li2+2xZn1-xGeO4(0.36<x<0.85) were synthesized for the first time by microwave radiation,All microwave reactions are usually completed within 60～120 minutes at a microwave frequency of 2 450 MHz and power of 50～650 W.The XRD patterns and SEM photographs indicate that the grains of samples prepared by microwave heating are small and uniform.Compared with the conventional synthetic method,the microwave dielectric heating effect not only leads to the dramatically rapid rate of solid state reaction,but also allows some control of materials'properties and reaction selectivity.The results of preliminary study on the mechanism of microwave radiation synthesis show that the heating media can stimulate the absorption of micro-wave radiation by the reactants,and then the ionic diffusion rate on the interface of reactant and product increased.The formation of crystallites of fast ionic conductor and the crystal growth were also induced by microwave dielectric loss heating.