Abstract
AbstractLa2(Zr1−xTix)3(MoO4)9 (0 ≤ x ≤ 0.1) ceramics were prepared by the traditional solid‐state reaction method. XRD analysis showed that La2(Zr1−xTix)3(MoO4)9 (0 ≤ x ≤ 0.1) ceramics belonged to a trigonal system. Based on the chemical bond theory, the consequences of bond energy, bond ionicity, lattice energy, and thermal expansion coefficient of ceramics on microwave dielectric properties were discussed. As Ti4+ addition was increased, the reduction in dielectric constant was ascribed to the fact that the polarizability of Ti4+ is smaller than Zr4+, and the downward trend was related to the bond ionicity. Besides, the tendency of Q·f value depended on the packing fraction and the lattice energy. The improvement in τf value, the increase in bond energy, and the decrease in the coefficient of thermal expansion were all correlated. The far‐infrared spectra implied that the absorptions of structural phonon oscillation were the main reason for the maximum polarization contribution. La2(Zr0.92Ti0.08)3(MoO4)9 ceramics sintered at 750°C for 4 hours exhibited the best dielectric properties (εr = 10.33, Q·f = 80 658 GHz, and τf = 3.48 ppm/°C).
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