A novel high-Q and low-temperature sintering Li2Mg3Ti1-x(Al1/2Nb1/2)xO6-4wt%LiF microwave dielectric ceramics

A novel system Li2Mg3Ti1-x(Al1/2Nb1/2)xO6-4wt%LiF(0.02 ≤ x ≤ 0.08) ceramics were synthesized by the solid stated reaction method to improve the microwave dielectric properties of the ceramics. The phase composition, sintering characteristics and microwave dielectric properties of Li2Mg3Ti1-x(Al1/2Nb1/2)xO6-4wt%LiF(0.02 ≤ x ≤ 0.08) ceramics were then explored. The results demonstrated that at the optimal sintering temperature(900 °C), with the (Al1/2Nb1/2)4+ ions increased, the εr value decreased and the absolute value of τƒ augmented. Moreover, the Q × f value of ceramics was in accord with the relative density, which enlarged at first until the doping content reached the solid solubility limit (0.04 mol) of the ceramics. In total, the Li2Mg3Ti1-0.96(Al1/2Nb1/2)0.04O6-4wt%LiF ceramics sintered at 900 °C for 6 h showed the best microwave dielectric properties of εr~15.54, Q × f~154,000 GHz and τƒ~-38.3 ppm/°C. •A novel high-Q Li2Mg3Ti1-x(Al1/2Nb1/2)xO6-4wt%LiF(0.02 ≤ x ≤ 0.08) ceramics were prepared by solid stated reaction.•The Q × f value of ceramics was increased by the substitution of (Al1/2Nb1/2)4+.•The Li2Mg3Ti0.96(Al1/2Nb1/2)0.04O6-4wt%LiF ceramics sintered at 900 °C exhibited excellent microwave dielectric properties.