Effects of rare earth oxides on phase composition and microwave dielectric properties of (Zn_(0.5)Ti_(0.5))_(1-x)Ln_xNbO_4 ceramic

摘要

In this study, effects of rare earth oxides Ln_2O_3 (Ln = Ce, Sm, La, Nd) on crystal structure, phase compositions, and microwave dielectric properties of ixiolite-type Zn_(0.5)Ti_(0.5)NbO_4 ceramic were studied based on powder X-ray diffraction patterns and Rietveld refinement methods. Addition of Ln~(3+) cations brought in a different secondary phase, which strongly relied on the types of Ln elements and their contents. The results show that developments of microwave dielectric properties of (Zn_(0.5)Ti_(0.5))_(1-x)Ln_xNbO_4 ceramics are mainly dependent on phase compositions and phase contents. Temperature-stable microwave dielectric properties of (Zn_(0.5)Ti_(0.5))_(1-x)Ln_xNbO_4 (Ln = Sm, x = 0.5) were achieved: ε_r = 41.01, Q×f = 8583 GHz,τ_f = 3.60 ppm/°C, sintered at 1200 °C for 4 h.