Effect Of Ni2+ Substitution On Crystal Structure And Microwave Dielectric Properties For Mgzrnb2o8 Ceramics

Monoclinic structured Mg1-xNixZrNb2O8 (0 <= x <= 0.12) ceramics were synthesized for the first time through traditional solid-state reaction process and pure phase were obtained in all range. Rietveld refinement was used to analyze the crystal structure. With the increase of Ni2+ substitution amount, epsilon(r) decreased, Q x f rose first then fell, tau(f) shifted for the positive direction. Bond ionicity, lattice energy and bond energy were separately calculated to investigate the correlations with microwave dielectric properties. Typically, ceramics samples with the composition of Mg0.92Ni0.08ZrNb2O8 sintered at 1280 degrees C for 4 h exhibited the optimum microwave dielectric properties: epsilon(r) = 24.58, Q x f = 74534.1 GHz, tau(f) = - 49.11 ppm/degrees C, which could be a promising material for application.