Abstract
In this work, the preparation of Li3(Mg4-xCux)NbO8 (0.01 ≤ x ≤ 0.04) was accomplished using the solid-state reaction method. Based on Rietveld refinement, microscopic morphology, and the complex chemical bonding theory, the influence of Cu2+ introduction on the microwave dielectric properties of Li3Mg4NbO8 ceramics was investigated, revealing the relationship between crystal structure and dielectric properties. The εr was affected by both the relative density and ionic polarizability. A moderate amount of Cu2+ (x = 0.02) substitution for Mg2+ increased the lattice energy, which could enhance the Q×f value. Additionally, the τf value also moved towards near zero because of the improvement in Nb-O6 octahedral distortion. Outstanding dielectric properties were achieved for Li3(Mg3.98Cu0.02)NbO8 ceramics at 1075 °C: εr ∼13.59, Q×f ∼115,444 GHz, τf ∼-11.19 ppm/°C. Compared to pure Li3Mg4NbO8 ceramics, its Q×f value increased by 11.6%, and τf increased by 68.9%.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
