Microwave dielectric properties and microstructure of a new kind Eu-based Eu(Mg_(0.5)Ti_(0.5))O_3 ceramic

摘要

A new Eu-based microwave dielectric ceramic,Eu(Mg_(0.5)Ti_(0.5))O_3(EMT for short), was prepared through conventional solid-state reactions. The EMT ceramics were well densified at 1425 ℃ and exhibit good microwave dielectric properties with permittivity of 23.92, high quality factor(Q*f) of 66,957 GHz at 8.93 GHz and relatively low-temperature coefficient of resonant frequency of-20.3 10^(-6)/K. Additionally, the variations of dielectric constants among Ln(Mg_(0.5)Ti_(0.5))O_3(Ln represents rare earth elements, LMT) compounds were analyzed. Ionic radii of Ln^(3+), associated with the tolerance factors of the perovskite structure of LMT, were investigated to be the key factor to influence the permittivity. These results indicate that EMT ceramics might be one of the promising candidates as microwave resonators.