AB2O4型尖晶石结构微波介质陶瓷研究进展

摘要

AnB2nO4n(n=1,2,3)系列尖晶石陶瓷普遍具有高的品质因数、可调的介电常数和谐振频率温度系数,并与Ag电极具有良好的化学共容性,是极有可能应用在低温共烧陶瓷上的一类微波介质陶瓷.介绍了尖晶石陶瓷的晶体结构,总结了不同n取值陶瓷的微波介电性能及其调控,讨论了Li元素进入尖晶石晶格后离子分布的演变,并重点讨论Li基尖晶石陶瓷的烧结温度和微波介电性能,以及离子取代对其性能的调节.另外,还尝试改变一些代表性陶瓷的成分以获得更好的综合微波介电性能.具体的方法包括形成固溶体和第二相,以及非化学计量比调节.最后,对Li基尖晶石结构微波介质陶瓷工业化应用进行了展望.%AnB2nO4n (n = 1, 2, 3) spinel ceramics are good microwave dielectric materials with high quality factor, tunable permittivity and temperature coefficient of resonance frequency, and chemical compatibility with silver, which makes them potential candidates for low temperature co-fired ceramic (LTCC) application. The crystal structure of spinel ceramics is introduced and the microwave dielectric properties of spinel ceramics with different n values are summarized. The evolution of cation distributions is discussed as Li element is introduced into the spinel lattice, and it is focused on the sintering temperature (S.T.) and microwave dielectric properties of Li-based spinel ceramics and their properties adjustment by the ion substitution. Furthermore, the components of some candidates are modified to achieve better combination of microwave dielectric properties. The specific methods include formation of solid solution and second phase, and non-stoichiometric adjustment. In the end, the possibility of Li-based spinel ceramics is evaluated for practical application.