Microwave dielectric properties of low loss Li2(Mg0.95A0.05)3TiO6(A = Ca2+, Ni2+, Zn2+, Mn2+) ceramics system

Ultra low loss microwave dielectric materials of Li-2(Mg(0.95)A(0.05))(3)TiO6( A = Ca2+, Ni2+, Zn2+, Mn2+) ceramics were investigated through conventional solid-state reaction method. The effects of different bivalent A(2+)(A(2+) = Ca2+, Ni2+, Zn2+, Mn2+) substitution for Mg on the phase composition, microstructure and microwave dielectric properties were systematically discussed. The XRD patterns indicated that the main peaks belonged to Li2Mg3TiO6, and little impurities were formed. We have found that Znsubstitution for Mg, which could increase its Q x f value and lower the vertical bar tau(f)vertical bar compared to that of pure Li2Mg3TiO6, had a significant effect on the Q x f and tau(f) of the ceramics. Li-2(Mg(0.95)A(0.05))(3)TiO6 ceramics specimens with A = Zn2+ sintered at 1275 degrees C for 6h exhibited excellent microwave dielectric properties of epsilon(r)-14.6, Q x f-158,000GHz (at 9.11GHz) and a near-zero tau(f)- +3.2 ppm/degrees C. (C) 2016 Elsevier B.V. All rights reserved.