Significantly Enhanced Sinterability And Temperature Stability Of Li3mg4nbo8-Based Microwave Dielectric Ceramics With Lif And Ba-3(Vo4)(2) Addition

Li3Mg4NbO8-basic composite ceramics were elaborated via the solid-state reaction process, in which LiF and Ba-3(VO4)(2) were utilized as a sintering aid and reinforcement phase, respectively. The sinterability, phase assemblage, microstructures, and microwave dielectric performances of Li3Mg4NbO8-LiF-Ba-3(VO4)(2) composite ceramics were thoroughly researched. The co-addition of LiF-Ba-3(VO4)(2) can simultaneously lower the sintering temperature and improve the thermal stability of Li3Mg4NbO8-basic ceramics. Solid state activated sintering is responsible for the low-temperature densification of the present ceramics. The coexistence of rock-salt structural Li3Mg4NbO8/Li4Mg4NbO8F and hexagonal structural Ba-3(VO4)(2) phases was demonstrated by the combinational XRD and SEM-EDS analysis results. The 0.65(Li3Mg4NbO8-LiF)-0.35Ba(3)(VO4)(2) ceramics fired at 825 degrees C/5 h exhibited promising microwave dielectric performances: tau(f) = 0.5 ppm/degrees C along with epsilon(r) = 13.8 and Qxf = 68500 GHz. The good compatibility of the developed ceramics with Ag demonstrates it potential for use in LTCC technology.