Abstract
The dense MgZr(Nb1−xSbx)2O8 ceramics were synthesized through standard solid state reaction route. All samples were identified as the pure phase with monoclinic wolframite structure and P2/c space group. SEM was carried out to study the effect of surface morphology on dielectric properties. Rietveld refinement was utilized to observe the impact of equivalent substitution (Sb5+) at the Nb-site on the microstructure of crystals. The phenomenon of non-monotonic changing in quality factor (Q × f) and monotonic increase in dielectric constant (εr) was explained by bond ionicity and lattice energy based on the P-V-L theory. In addition, the deterioration of temperature coefficient of resonant frequency (τf) was closely related to the reduction of bond energy. Finally, the optimum dielectric properties of MgZr(Nb0.92Sb0.08)2O8 sample sintered at 1320 °C for 6 h were obtained: εr = 25.69, Q × f = 83505.2 GHz, τf = −58.74 ppm/°C.
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