Effect of Ni~(2+) substitution on crystal structure and microwave dielectric properties for MgZrNb_2O_8 ceramics

摘要

AbstractMonoclinic 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,εrdecreased,Q × frose first then fell,τfshifted 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 Mg0.92Ni0.08ZrNb2O8sintered at 1280 °C for 4 h exhibited the optimum microwave dielectric properties:εr = 24.58,Q × f = 74534.1 GHz,τf = − 49.11 ppm/°C, which could be a promising material for application.