Li基尖晶石结构氧化物的组成、结构调控与微波介电性能研究

可低温烧结的微波介电材料是现代通信技术的关键基础材料。本申请拟在阳离子组成与占位设计的基础上，通过与以软化学法为主的方法合成系列不同B位有序类型的Li基尖晶石型化合物，系统开展结构（晶体结构、电子结构与微结构）、有序-无序相变特性与介电性能研究，探讨其不同组成、结构（B位有序类型与有序度、氧八面体倾斜与偏转等）对性能的影响规律及机制，进而有效指导Li基尖晶石结构可低温烧结的微波介电材料新体系的选择与性能优化，因此在科学研究与实际应用两方面都具有十分重要的价值和意义。

Low temperature sinterable microwave dielectric ceramics become the key fundamental materials for modern communication technique. On the base of composition and distribution design of cations in A and B sites, a series of Li-containing spinels with different kinds of B-site ordering will be mainly synthesized by soft chemical methods. Firstly,the structure including crystal structure, electronic structure and microstructure, order-disorder and dielectric properties of the compounds are characterized. Then the effect and mechanism of composition, structure(different degree of B-site order/disordering , distorted or tilt of oxygen octahedra) on properties are investigated. Finally, the exploration of novel Li-spinel microwave dielectric ceramics with low sintering temperature could be selected and its properties might be optimized, and this project is of significant importance on both of scientific research and practical application.